diff --git a/.claude/skills/pr-workflow/SKILL.md b/.claude/skills/pr-workflow/SKILL.md
new file mode 100644
index 00000000..72bbef70
--- /dev/null
+++ b/.claude/skills/pr-workflow/SKILL.md
@@ -0,0 +1,130 @@
+---
+name: pr-workflow
+description: Create pull requests for python-zeroconf/python-zeroconf. Use when creating PRs, submitting changes, or preparing contributions.
+allowed-tools: Read, Bash, Glob, Grep
+---
+
+# python-zeroconf PR Workflow
+
+When creating a pull request for `python-zeroconf/python-zeroconf`,
+follow these steps. Repo-wide conventions live in
+[CLAUDE.md](../../../CLAUDE.md); this skill summarises the parts
+that matter at PR-creation time.
+
+## 1. Create branch from origin/master
+
+The default branch is `master`, not `main`. `origin` already
+points at `python-zeroconf/python-zeroconf` — there is no fork in
+this workflow. Always re-fetch first so the branch is based on
+the latest `master`:
+
+```bash
+git fetch origin
+git checkout -b <branch-name> origin/master
+```
+
+If you accidentally branch from `main`, `gh pr create` will fail
+because the base branch does not exist.
+
+## 2. There is no PR template
+
+`python-zeroconf` does not ship a `.github/PULL_REQUEST_TEMPLATE.md`
+— PR bodies are free-form. Aim for a body that looks roughly like:
+
+```
+## Summary
+<1–3 sentence prose description of what changed and why>
+
+## Details
+<bullets explaining the non-obvious parts: RFC sections cited,
+performance characteristics measured, edge cases handled>
+
+## Test plan
+- [ ] <how you verified the change>
+- [ ] <new tests added under tests/ — point at the file>
+```
+
+Cite the relevant RFC section (RFC 6762 / RFC 6763) for any
+behaviour change that affects packet contents or timing —
+reviewers shouldn't have to reverse-engineer why a constant moved
+or a probe interval changed.
+
+## 3. PR title conventions
+
+PRs are squash-merged, so the PR title becomes the commit on
+`master`. Only the PR title is linted (by the `pr-title` CI job
+running `amannn/action-semantic-pull-request`); per-commit
+messages on the PR branch are not checked.
+
+- **Conventional Commits prefix is required on the PR title.**
+  Pick from: `feat`, `fix`, `perf`, `refactor`, `docs`, `test`,
+  `build`, `ci`, `chore`, `style`, `revert`. The
+  `feat`/`fix`/`perf` prefixes show up in the release-notes;
+  `chore*` and `ci*` are excluded by semantic-release
+  (`exclude_commit_patterns` in `pyproject.toml`), so use those
+  for housekeeping.
+- **Imperative-mood subject.** "fix: handle empty answer", not
+  "fix: handled empty answer".
+- **Lowercase first character after the prefix** (enforced by
+  `subjectPattern: ^(?![A-Z]).+$`).
+- **No `Co-Authored-By` trailers from automated agents.**
+- **One logical change per PR.** Let pre-commit run (ruff
+  lint + format, mypy, flake8, codespell, cython-lint,
+  pyupgrade). If a hook auto-fixes something, re-stage and
+  re-commit.
+
+## 4. Cython / `.pxd` discipline
+
+If the PR touches any module listed in `TO_CYTHONIZE`
+(`build_ext.py`):
+
+- Update the sibling `.pxd` in the same commit if you changed a
+  `cdef class` layout or a `cpdef`/`cdef` signature.
+- Do not hand-edit the in-tree `.c` files; the build regenerates
+  them, and they're excluded from sdist (`exclude = ["**/*.c"]`
+  in `pyproject.toml`).
+- Verify the extension still builds locally:
+  `REQUIRE_CYTHON=1 poetry install` (re-installs in-place,
+  failing loudly if Cython rejects anything).
+- Verify it still works without the extension:
+  `SKIP_CYTHON=1 poetry install && poetry run pytest tests/`.
+
+## 5. Push and create the PR
+
+```bash
+git push -u origin <branch-name>
+gh pr create --repo python-zeroconf/python-zeroconf --base master \
+  --title "<conventional-commit subject>" \
+  --body-file /tmp/pr-body.md
+```
+
+Always pass the body via `--body-file`, never `--body "..."` with
+shell-escaping — Markdown backticks, asterisks, and angle
+brackets must pass through verbatim.
+
+The PR title is what gets enforced — it becomes the squash-merge
+commit subject on `master`, so it has to parse as a Conventional
+Commit on its own. Per-commit messages on the branch are not
+linted.
+
+## 6. After the PR is open
+
+CI runs three jobs:
+
+- `lint` — `pre-commit/action`. If pre-commit passed locally
+  this passes too.
+- `pr-title` — `amannn/action-semantic-pull-request`. Validates
+  the PR title against Conventional Commits. If it fails, fix
+  the title in the GitHub UI or with `gh pr edit --title "..."`;
+  the workflow re-runs on the edit, no push needed.
+- `test` — the full pytest matrix across CPython 3.10–3.14,
+  3.14t (free-threaded), and PyPy 3.10, on Linux + macOS +
+  Windows. The free-threaded entry is the canary for unguarded
+  shared-state bugs; failures there are often genuine even when
+  the GIL-enabled rows pass.
+
+CodSpeed also runs on PRs (`CodSpeedHQ/action`) and posts a
+benchmark delta as a check. A regression there is signal — if
+the PR is a perf change, the comment is the evidence; if not, a
+red CodSpeed check usually means the hot path picked up an extra
+Python-level branch and wants a second look.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5e8d1ef0..2ac9d212 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,44 +4,59 @@ on:
   push:
     branches:
       - master
+      - release-0.x
   pull_request:
 
 concurrency:
   group: ${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
+env:
+  POETRY_VIRTUALENVS_IN_PROJECT: "true"
+  UV_PYTHON_PREFERENCE: only-managed  # avoid ancient system Python
+
 jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
-      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v4
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v5
         with:
           python-version: "3.12"
       - uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
 
-  # Make sure commit messages follow the conventional commits convention:
+  # Make sure the PR title follows the conventional commits convention:
   # https://www.conventionalcommits.org
-  commitlint:
-    name: Lint Commit Messages
+  # PRs are squash-merged, so the PR title becomes the commit on master and
+  # drives python-semantic-release's version bump.
+  pr-title:
+    name: Lint PR Title
     runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    permissions:
+      pull-requests: read
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6.1.1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
-          fetch-depth: 0
-      - uses: wagoid/commitlint-github-action@b948419dd99f3fd78a6548d48f94e3df7f6bf3ed # v6
+          subjectPattern: ^(?![A-Z]).+$
+          subjectPatternError: |
+            The subject "{subject}" found in the pull request title "{title}"
+            didn't match the configured pattern. Please ensure that the subject
+            starts with a lowercase character.
 
   test:
     strategy:
       fail-fast: false
       matrix:
         python-version:
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13"
-          - "pypy-3.9"
+          - "3.14"
+          - "3.14t"
           - "pypy-3.10"
         os:
           - ubuntu-latest
@@ -55,71 +70,97 @@ jobs:
             extension: use_cython
           - os: windows-latest
             extension: use_cython
-          - os: windows-latest
-            python-version: "pypy-3.9"
           - os: windows-latest
             python-version: "pypy-3.10"
-          - os: macos-latest
-            python-version: "pypy-3.9"
           - os: macos-latest
             python-version: "pypy-3.10"
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v4
+      - name: Set up uv
+        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+        with:
+          enable-cache: true
       - name: Install poetry
-        run: pipx install poetry
+        run: uv tool install poetry
       - name: Set up Python
-        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+        id: setup-python
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v5
         with:
           python-version: ${{ matrix.python-version }}
           cache: "poetry"
           allow-prereleases: true
+      - name: Cache poetry venv
+        id: cache-venv
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        with:
+          path: |
+            .venv
+            src/zeroconf/**/*.so
+          key: venv-v1-${{ runner.os }}-py${{ steps.setup-python.outputs.python-version }}-${{ matrix.extension }}-${{ hashFiles('poetry.lock', 'pyproject.toml', 'build_ext.py', 'src/zeroconf/**/*.py', 'src/zeroconf/**/*.pxd') }}
       - name: Install Dependencies no cython
-        if: ${{ matrix.extension == 'skip_cython' }}
+        if: ${{ matrix.extension == 'skip_cython' && steps.cache-venv.outputs.cache-hit != 'true' }}
         env:
           SKIP_CYTHON: 1
         run: poetry install --only=main,dev
       - name: Install Dependencies with cython
-        if: ${{ matrix.extension != 'skip_cython' }}
+        if: ${{ matrix.extension != 'skip_cython' && steps.cache-venv.outputs.cache-hit != 'true' }}
         env:
           REQUIRE_CYTHON: 1
         run: poetry install --only=main,dev
       - name: Test with Pytest
         run: poetry run pytest --durations=20 --timeout=60 -v --cov=zeroconf --cov-branch --cov-report xml --cov-report html --cov-report term-missing tests
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@ad3126e916f78f00edff4ed0317cf185271ccc2d # v5
+        uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
 
   benchmark:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v4
       - name: Setup Python 3.13
-        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+        id: setup-python
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v5
         with:
           python-version: 3.13
-      - uses: snok/install-poetry@76e04a911780d5b312d89783f7b1cd627778900a # v1.4.1
+      - name: Set up uv
+        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+        with:
+          enable-cache: true
+      - name: Install poetry
+        run: uv tool install poetry
+      - name: Cache poetry venv
+        id: cache-venv
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        with:
+          path: |
+            .venv
+            src/zeroconf/**/*.so
+          key: venv-v1-${{ runner.os }}-benchmark-py${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('poetry.lock', 'pyproject.toml', 'build_ext.py', 'src/zeroconf/**/*.py', 'src/zeroconf/**/*.pxd') }}
       - name: Install Dependencies
+        if: steps.cache-venv.outputs.cache-hit != 'true'
         run: |
           REQUIRE_CYTHON=1 poetry install --only=main,dev
         shell: bash
       - name: Run benchmarks
-        uses: CodSpeedHQ/action@0010eb0ca6e89b80c88e8edaaa07cfe5f3e6664d # v3
+        uses: CodSpeedHQ/action@3194d9a39c4d46684cb44bf7207fc56626aad8fd # v3
         with:
           token: ${{ secrets.CODSPEED_TOKEN }}
           run: poetry run pytest --no-cov -vvvvv --codspeed tests/benchmarks
+          mode: instrumentation
 
   release:
     needs:
       - test
       - lint
-      - commitlint
     if: ${{ github.repository_owner }} == "python-zeroconf"
 
     runs-on: ubuntu-latest
     environment: release
-    concurrency: release
+    concurrency:
+      group: release-${{ github.head_ref || github.ref }}
+      cancel-in-progress: false
     permissions:
       id-token: write
       contents: write
@@ -128,32 +169,35 @@ jobs:
       newest_release_tag: ${{ steps.release.outputs.tag }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v4
         with:
           fetch-depth: 0
-          ref: ${{ github.head_ref || github.ref_name }}
+          ref: ${{ github.ref }}
+
+      - name: Create local branch name
+        run: git switch -C ${{ github.head_ref || github.ref_name }}
 
       # Do a dry run of PSR
       - name: Test release
-        uses: python-semantic-release/python-semantic-release@26bb37cfab71a5a372e3db0f48a6eac57519a4a6 # v9.21.0
+        uses: python-semantic-release/python-semantic-release@350c48fcb3ffcdfd2e0a235206bc2ecea6b69df0 # v10.5.3
         if: github.ref_name != 'master'
         with:
-          root_options: --noop
+          no_operation_mode: true
 
       # On main branch: actual PSR + upload to PyPI & GitHub
       - name: Release
-        uses: python-semantic-release/python-semantic-release@26bb37cfab71a5a372e3db0f48a6eac57519a4a6 # v9.21.0
+        uses: python-semantic-release/python-semantic-release@350c48fcb3ffcdfd2e0a235206bc2ecea6b69df0 # v10.5.3
         id: release
         if: github.ref_name == 'master'
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@76f52bc884231f62b9a034ebfe128415bbaabdfc # release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1
         if: steps.release.outputs.released == 'true'
 
       - name: Publish package distributions to GitHub Releases
-        uses: python-semantic-release/upload-to-gh-release@0a92b5d7ebfc15a84f9801ebd1bf706343d43711 # main
+        uses: python-semantic-release/publish-action@310a9983a0ae878b29f3aac778d7c77c1db27378 # v10.5.3
         if: steps.release.outputs.released == 'true'
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
@@ -170,8 +214,7 @@ jobs:
           [
             ubuntu-24.04-arm,
             ubuntu-latest,
-            windows-2019,
-            macos-13,
+            windows-latest,
             macos-latest,
           ]
         qemu: [""]
@@ -184,62 +227,83 @@ jobs:
             musl: "musllinux"
           # qemu is slow, make a single
           # runner per Python version
-          - os: ubuntu-latest
-            qemu: armv7l
-            musl: "musllinux"
-            pyver: cp39
-          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
             qemu: armv7l
             musl: "musllinux"
             pyver: cp310
-          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
             qemu: armv7l
             musl: "musllinux"
             pyver: cp311
-          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
             qemu: armv7l
             musl: "musllinux"
             pyver: cp312
-          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
             qemu: armv7l
             musl: "musllinux"
             pyver: cp313
+          - os: ubuntu-24.04-arm
+            qemu: armv7l
+            musl: "musllinux"
+            pyver: cp314
+          - os: ubuntu-24.04-arm
+            qemu: armv7l
+            musl: "musllinux"
+            pyver: cp314t
           # qemu is slow, make a single
           # runner per Python version
-          - os: ubuntu-latest
-            qemu: armv7l
-            musl: ""
-            pyver: cp39
-          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
             qemu: armv7l
             musl: ""
             pyver: cp310
-          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
             qemu: armv7l
             musl: ""
             pyver: cp311
-          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
             qemu: armv7l
             musl: ""
             pyver: cp312
-          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
             qemu: armv7l
             musl: ""
             pyver: cp313
+          - os: ubuntu-24.04-arm
+            qemu: armv7l
+            musl: ""
+            pyver: cp314
+          - os: ubuntu-24.04-arm
+            qemu: armv7l
+            musl: ""
+            pyver: cp314t
+          # qemu is slow, make a single runner per Python version
+          - {os: ubuntu-latest, qemu: riscv64, musl: "musllinux", pyver: cp310}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "musllinux", pyver: cp311}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "musllinux", pyver: cp312}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "musllinux", pyver: cp313}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "musllinux", pyver: cp314}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "musllinux", pyver: cp314t}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "", pyver: cp310}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "", pyver: cp311}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "", pyver: cp312}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "", pyver: cp313}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "", pyver: cp314}
+          - {os: ubuntu-latest, qemu: riscv64, musl: "", pyver: cp314t}
     steps:
       - name: Checkout
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v4
         with:
           fetch-depth: 0
           ref: "master"
       # Used to host cibuildwheel
       - name: Set up Python
-        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v5
         with:
           python-version: "3.12"
       - name: Set up QEMU
         if: ${{ matrix.qemu }}
-        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392 # v3
+        uses: docker/setup-qemu-action@ce360397dd3f832beb865e1373c09c0e9f86d70a # v4.0.0
         with:
           platforms: all
           # This should be temporary
@@ -262,20 +326,21 @@ jobs:
             echo "CIBW_BUILD=${{ matrix.pyver }}*" >> $GITHUB_ENV
           fi
 
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v4
         with:
           ref: ${{ needs.release.outputs.newest_release_tag }}
           fetch-depth: 0
 
       - name: Build wheels ${{ matrix.musl }} (${{ matrix.qemu }})
-        uses: pypa/cibuildwheel@faf86a6ed7efa889faf6996aa23820831055001a # v2.23.3
+        uses: pypa/cibuildwheel@8d2b08b68458a16aeb24b64e68a09ab1c8e82084 # v3.4.1
         # to supply options, put them in 'env', like:
         env:
-          CIBW_SKIP: cp36-* cp37-* pp36-* pp37-* pp38-* cp38-* ${{ matrix.musl == 'musllinux' && '*manylinux*' || '*musllinux*' }}
+          CIBW_SKIP: cp38-* cp39-* pp38-* pp39-* ${{ matrix.musl == 'musllinux' && '*manylinux*' || '*musllinux*' }}
           CIBW_BEFORE_ALL_LINUX: apt install -y gcc || yum install -y gcc || apk add gcc
+          CIBW_ARCHS_MACOS: arm64
           REQUIRE_CYTHON: 1
 
-      - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v4
         with:
           path: ./wheelhouse/*.whl
           name: wheels-${{ matrix.os }}-${{ matrix.musl }}-${{ matrix.qemu }}-${{ matrix.pyver }}
@@ -288,7 +353,7 @@ jobs:
       id-token: write # IMPORTANT: this permission is mandatory for trusted publishing
 
     steps:
-      - uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v4
         with:
           # unpacks default artifact into dist/
           # if `name: artifact` is omitted, the action will create extra parent dir
@@ -297,4 +362,4 @@ jobs:
           merge-multiple: true
 
       - uses:
-          pypa/gh-action-pypi-publish@76f52bc884231f62b9a034ebfe128415bbaabdfc # v1.12.4
+          pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # v1.14.0
diff --git a/.gitignore b/.gitignore
index 430fbec9..4dde1f97 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
 build/
 *.pyc
 *.pyo
+.coverage
+coverage.xml
+htmlcov/
 Thumbs.db
 .DS_Store
 .project
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 429bea6e..1e6df8db 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -8,13 +8,8 @@ ci:
   autoupdate_commit_msg: "chore(pre-commit.ci): pre-commit autoupdate"
 
 repos:
-  - repo: https://github.com/commitizen-tools/commitizen
-    rev: v4.6.1
-    hooks:
-      - id: commitizen
-        stages: [commit-msg]
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v5.0.0
+    rev: v6.0.0
     hooks:
       - id: check-builtin-literals
       - id: check-case-conflict
@@ -35,31 +30,31 @@ repos:
         args: ["--tab-width", "2"]
         files: ".(css|html|js|json|md|toml|yaml)$"
   - repo: https://github.com/asottile/pyupgrade
-    rev: v3.19.1
+    rev: v3.21.2
     hooks:
       - id: pyupgrade
-        args: [--py39-plus]
+        args: [--py310-plus]
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.11.8
+    rev: v0.15.13
     hooks:
       - id: ruff
         args: [--fix, --exit-non-zero-on-fix]
       - id: ruff-format
   - repo: https://github.com/codespell-project/codespell
-    rev: v2.4.1
+    rev: v2.4.2
     hooks:
       - id: codespell
   - repo: https://github.com/PyCQA/flake8
-    rev: 7.2.0
+    rev: 7.3.0
     hooks:
       - id: flake8
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.15.0
+    rev: v2.1.0
     hooks:
       - id: mypy
         additional_dependencies: [ifaddr]
   - repo: https://github.com/MarcoGorelli/cython-lint
-    rev: v0.16.6
+    rev: v0.19.0
     hooks:
       - id: cython-lint
       - id: double-quote-cython-strings
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d8a3d4cf..d303d06a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,356 @@
 # CHANGELOG
 
+<!-- version list -->
+
+## v0.149.16 (2026-05-21)
+
+### Bug Fixes
+
+- Re-release for GHSA-qc2x-6f54-m6h9
+  ([#1770](https://github.com/python-zeroconf/python-zeroconf/pull/1770),
+  [`fad8646`](https://github.com/python-zeroconf/python-zeroconf/commit/fad86461630237d1f0c04e3745fef65e4cc3055c))
+
+
+## v0.149.15 (2026-05-21)
+
+### Bug Fixes
+
+- Preserve scope_id when scoped AAAA arrives alongside unscoped
+  ([#1764](https://github.com/python-zeroconf/python-zeroconf/pull/1764),
+  [`e2352ea`](https://github.com/python-zeroconf/python-zeroconf/commit/e2352ea84437d6fca81dfbdc41116feaaf45fefc))
+
+
+## v0.149.14 (2026-05-20)
+
+### Bug Fixes
+
+- Skip NSEC records in ServiceBrowser to suppress spurious updates
+  ([#1762](https://github.com/python-zeroconf/python-zeroconf/pull/1762),
+  [`137a5d6`](https://github.com/python-zeroconf/python-zeroconf/commit/137a5d6c29389ffcd8abfba0925d8cbe58cb2c1b))
+
+### Testing
+
+- Add blockbuster to detect blocking calls in asyncio tests
+  ([#1761](https://github.com/python-zeroconf/python-zeroconf/pull/1761),
+  [`90a5a39`](https://github.com/python-zeroconf/python-zeroconf/commit/90a5a39df7400926bc5498a86b9fe4c46eaffd44))
+
+- Scale aggregation timings 10x to speed up timing-dependent tests
+  ([#1759](https://github.com/python-zeroconf/python-zeroconf/pull/1759),
+  [`3e5ac4f`](https://github.com/python-zeroconf/python-zeroconf/commit/3e5ac4fbc5cd8d8b5ffed5cc8994782e7157cfad))
+
+- Shave loopback timing overhead from remaining slow tests
+  ([#1760](https://github.com/python-zeroconf/python-zeroconf/pull/1760),
+  [`343dc7a`](https://github.com/python-zeroconf/python-zeroconf/commit/343dc7a305b47a574f58265081f172ed54f461bb))
+
+- Widen QM follow-up window in info_asking_default test
+  ([#1765](https://github.com/python-zeroconf/python-zeroconf/pull/1765),
+  [`4ffba87`](https://github.com/python-zeroconf/python-zeroconf/commit/4ffba87177fcc11a0fd8ccb7d93c6996a1269a26))
+
+
+## v0.149.13 (2026-05-20)
+
+### Bug Fixes
+
+- Bound record payload reads against rdlength overrun
+  ([#1756](https://github.com/python-zeroconf/python-zeroconf/pull/1756),
+  [`5444495`](https://github.com/python-zeroconf/python-zeroconf/commit/544449596e645fcaad3834fa0cb614a54f847a82))
+
+### Documentation
+
+- Clarify LGPL-2.1-or-later license in README
+  ([#1763](https://github.com/python-zeroconf/python-zeroconf/pull/1763),
+  [`28bb01f`](https://github.com/python-zeroconf/python-zeroconf/commit/28bb01f23951f7883d8c3af66b6d537c34c516c7))
+
+### Refactoring
+
+- Extract loopback Zeroconf fixtures and mock_incoming_msg helper
+  ([#1758](https://github.com/python-zeroconf/python-zeroconf/pull/1758),
+  [`cb0af4a`](https://github.com/python-zeroconf/python-zeroconf/commit/cb0af4a8f4cdaad3721a2851d9fa17709d39ae62))
+
+
+## v0.149.12 (2026-05-20)
+
+### Bug Fixes
+
+- Bound QuestionHistory per-entry known-answer payload
+  ([#1755](https://github.com/python-zeroconf/python-zeroconf/pull/1755),
+  [`4ff6540`](https://github.com/python-zeroconf/python-zeroconf/commit/4ff65407bdc097f73a8b1f98659572e24d5c0df1))
+
+- Bound TC-deferred queues against spoofed-source flood OOM
+  ([#1751](https://github.com/python-zeroconf/python-zeroconf/pull/1751),
+  [`b22c8ff`](https://github.com/python-zeroconf/python-zeroconf/commit/b22c8ff19c66c68907d220a4823c0950f4fa93f7))
+
+
+## v0.149.11 (2026-05-20)
+
+### Bug Fixes
+
+- Bound duplicate-packet dedup against alternating-payload floods
+  ([#1750](https://github.com/python-zeroconf/python-zeroconf/pull/1750),
+  [`8c9d6ce`](https://github.com/python-zeroconf/python-zeroconf/commit/8c9d6ce0ccdb8854d14606c93f3790482363e1b9))
+
+
+## v0.149.10 (2026-05-20)
+
+### Bug Fixes
+
+- Accept uppercase .local. trailer in service_type_name
+  ([#1747](https://github.com/python-zeroconf/python-zeroconf/pull/1747),
+  [`37edde2`](https://github.com/python-zeroconf/python-zeroconf/commit/37edde2f5d9688e9d6c6573ee41a7cd25a54111e))
+
+- Bound TC-deferral assembly window to first-arrival + max delay
+  ([#1732](https://github.com/python-zeroconf/python-zeroconf/pull/1732),
+  [`a096238`](https://github.com/python-zeroconf/python-zeroconf/commit/a0962385a5079d6204fac7744fee9a9d67233eec))
+
+### Testing
+
+- Add codspeed benchmarks for listener duplicate-packet dedup
+  ([#1744](https://github.com/python-zeroconf/python-zeroconf/pull/1744),
+  [`068c3f6`](https://github.com/python-zeroconf/python-zeroconf/commit/068c3f68aeaaaf085d5fa197f7bff304ab80f847))
+
+
+## v0.149.9 (2026-05-20)
+
+### Bug Fixes
+
+- Bound QuestionHistory size to prevent LAN-driven OOM
+  ([#1733](https://github.com/python-zeroconf/python-zeroconf/pull/1733),
+  [`0e5e637`](https://github.com/python-zeroconf/python-zeroconf/commit/0e5e637172ab7991e8e1f13be7e4e5d228ce8b8b))
+
+
+## v0.149.8 (2026-05-19)
+
+### Bug Fixes
+
+- Bound NSEC bitmap length against record end
+  ([#1731](https://github.com/python-zeroconf/python-zeroconf/pull/1731),
+  [`1d83550`](https://github.com/python-zeroconf/python-zeroconf/commit/1d83550c58ed0ea69b611a907cd4bdfcb2eef535))
+
+### Testing
+
+- Give IPv6-only loopback find() its own timeout
+  ([#1721](https://github.com/python-zeroconf/python-zeroconf/pull/1721),
+  [`fcd1ffb`](https://github.com/python-zeroconf/python-zeroconf/commit/fcd1ffb4af9b3b26bc0ecae30641251a4c9a4ba6))
+
+- Widen LOOPBACK_FIND_TIMEOUT under PyPy
+  ([#1742](https://github.com/python-zeroconf/python-zeroconf/pull/1742),
+  [`6924606`](https://github.com/python-zeroconf/python-zeroconf/commit/69246065085fa25f9baf20abbf0eaddcb4a4d88c))
+
+- Widen safety margin in test_response_aggregation_timings_multiple
+  ([#1737](https://github.com/python-zeroconf/python-zeroconf/pull/1737),
+  [`228af17`](https://github.com/python-zeroconf/python-zeroconf/commit/228af178657a70dd2e76420a8187345de6ede46f))
+
+
+## v0.149.7 (2026-05-18)
+
+### Bug Fixes
+
+- Bound DNSCache record count to prevent unbounded LAN-driven growth
+  ([#1718](https://github.com/python-zeroconf/python-zeroconf/pull/1718),
+  [`0ad3f37`](https://github.com/python-zeroconf/python-zeroconf/commit/0ad3f37b5b852b8f614d322283d148efb2cef6e4))
+
+### Testing
+
+- Shave ServiceBrowser first-query delay on loopback
+  ([#1720](https://github.com/python-zeroconf/python-zeroconf/pull/1720),
+  [`0ff3c6b`](https://github.com/python-zeroconf/python-zeroconf/commit/0ff3c6b9dd40e01263ce88803139c3ba68349682))
+
+
+## v0.149.6 (2026-05-18)
+
+### Bug Fixes
+
+- Bound _seen_logs and stop retaining exc_info
+  ([#1717](https://github.com/python-zeroconf/python-zeroconf/pull/1717),
+  [`95561e2`](https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec))
+
+
+## v0.149.5 (2026-05-18)
+
+### Bug Fixes
+
+- Bound DNS compression-pointer chain depth in DNSIncoming
+  ([#1719](https://github.com/python-zeroconf/python-zeroconf/pull/1719),
+  [`f9e2359`](https://github.com/python-zeroconf/python-zeroconf/commit/f9e23592137f30fdf7ef710dba065da31c79b1cf))
+
+### Testing
+
+- Cap helper get_service_info timeout in suppression test (~3.0s → ~1.85s)
+  ([#1708](https://github.com/python-zeroconf/python-zeroconf/pull/1708),
+  [`ee3c7d7`](https://github.com/python-zeroconf/python-zeroconf/commit/ee3c7d74ff45327a3a6d520b86a691e21e2bc219))
+
+- Drop ZeroconfServiceTypes.find() timeouts from 500ms to 200ms on loopback
+  ([#1710](https://github.com/python-zeroconf/python-zeroconf/pull/1710),
+  [`64d143d`](https://github.com/python-zeroconf/python-zeroconf/commit/64d143d2ee7874ee1d9cef0dd2799c008b4aa791))
+
+- Eliminate test_get_info_single race by injecting from the send mock
+  ([#1716](https://github.com/python-zeroconf/python-zeroconf/pull/1716),
+  [`963d3d7`](https://github.com/python-zeroconf/python-zeroconf/commit/963d3d70e1cde056967eba0d8747ddcd247ae707))
+
+- Fix race in test_register_and_lookup_type_by_uppercase_name
+  ([#1712](https://github.com/python-zeroconf/python-zeroconf/pull/1712),
+  [`91aa21d`](https://github.com/python-zeroconf/python-zeroconf/commit/91aa21d52a0873f5fc12d43675b1b521dfe20519))
+
+- Speed up service-info request tests with quick_request_timing fixture
+  ([#1709](https://github.com/python-zeroconf/python-zeroconf/pull/1709),
+  [`4bae30a`](https://github.com/python-zeroconf/python-zeroconf/commit/4bae30a2ed0910ee7c4f1d0f92f2c400a7b10f31))
+
+
+## v0.149.4 (2026-05-17)
+
+### Bug Fixes
+
+- **core**: Release sockets when close runs before engine setup completes
+  ([#1706](https://github.com/python-zeroconf/python-zeroconf/pull/1706),
+  [`0deb56b`](https://github.com/python-zeroconf/python-zeroconf/commit/0deb56b78fe6cd701a43ce34dccd4b69d6dd6d36))
+
+### Testing
+
+- Drop pending multicast responses before TOCTOU assertion
+  ([#1701](https://github.com/python-zeroconf/python-zeroconf/pull/1701),
+  [`d2058d9`](https://github.com/python-zeroconf/python-zeroconf/commit/d2058d95882c70fb2eb786d373a630314e656c15))
+
+- Speed up slow loopback tests (closes #1697)
+  ([#1699](https://github.com/python-zeroconf/python-zeroconf/pull/1699),
+  [`dd341a3`](https://github.com/python-zeroconf/python-zeroconf/commit/dd341a378e904cbf9b9a09e5c2ac8ff7c9944cd0))
+
+- Speed up slow loopback tests (closes #1700)
+  ([#1703](https://github.com/python-zeroconf/python-zeroconf/pull/1703),
+  [`d03ea36`](https://github.com/python-zeroconf/python-zeroconf/commit/d03ea364dea5866e0301ff11f6b78714ecf991e8))
+
+- Speed up test_async_wait_unblocks_on_update
+  ([#1702](https://github.com/python-zeroconf/python-zeroconf/pull/1702),
+  [`653c385`](https://github.com/python-zeroconf/python-zeroconf/commit/653c38559c468672cf907d808d432dec0fb06968))
+
+- Widen scheduling buffer in flaky get_info suppression test
+  ([#1698](https://github.com/python-zeroconf/python-zeroconf/pull/1698),
+  [`9b4db62`](https://github.com/python-zeroconf/python-zeroconf/commit/9b4db625e121c2d590ed8fe2f4d187d5e3bb9a73))
+
+
+## v0.149.3 (2026-05-17)
+
+### Bug Fixes
+
+- **ci**: Drop x86_64 mac wheels and clean up obsolete CIBW_SKIP entries
+  ([#1694](https://github.com/python-zeroconf/python-zeroconf/pull/1694),
+  [`104c5d6`](https://github.com/python-zeroconf/python-zeroconf/commit/104c5d6674896612aa83a89fd17b90de5f38a508))
+
+
+## v0.149.2 (2026-05-17)
+
+### Bug Fixes
+
+- **ci**: Drop retired macos-13 runner and skip cp39/pp39 in wheel matrix
+  ([#1693](https://github.com/python-zeroconf/python-zeroconf/pull/1693),
+  [`745198b`](https://github.com/python-zeroconf/python-zeroconf/commit/745198b1128213915c1c89829feb950046e3de91))
+
+
+## v0.149.1 (2026-05-16)
+
+### Bug Fixes
+
+- **ci**: Drop cp39 from cibuildwheel matrix
+  ([#1691](https://github.com/python-zeroconf/python-zeroconf/pull/1691),
+  [`591288b`](https://github.com/python-zeroconf/python-zeroconf/commit/591288ba77a872ce6ccfe040f9c73da89e180f8d))
+
+
+## v0.149.0 (2026-05-16)
+
+### Features
+
+- Drop Python 3.9 support ([#1688](https://github.com/python-zeroconf/python-zeroconf/pull/1688),
+  [`327b93d`](https://github.com/python-zeroconf/python-zeroconf/commit/327b93dc602707e25d53788f0fb14e142f4558b3))
+
+### Performance Improvements
+
+- **build**: Parallelize cython extension compilation
+  ([#1689](https://github.com/python-zeroconf/python-zeroconf/pull/1689),
+  [`1ea6b94`](https://github.com/python-zeroconf/python-zeroconf/commit/1ea6b940ecbfd7e7654ad022cf7f4f888cf1daa5))
+
+
+## v0.147.4 (2026-05-16)
+
+### Bug Fixes
+
+- **core**: Close owned event loop on Zeroconf.close() to stop FD leak
+  ([#1685](https://github.com/python-zeroconf/python-zeroconf/pull/1685),
+  [`2f78370`](https://github.com/python-zeroconf/python-zeroconf/commit/2f78370c75d1082afe3191b7447aebfff1206657))
+
+### Build System
+
+- Adjust actions checkout ref parameter on release
+  ([#1669](https://github.com/python-zeroconf/python-zeroconf/pull/1669),
+  [`bc8ec8d`](https://github.com/python-zeroconf/python-zeroconf/commit/bc8ec8d59d875522f75901644d423d30d803a030))
+
+### Documentation
+
+- Add CLAUDE.md orientation file and pr-workflow skill
+  ([#1672](https://github.com/python-zeroconf/python-zeroconf/pull/1672),
+  [`8f8b4d6`](https://github.com/python-zeroconf/python-zeroconf/commit/8f8b4d6526729906337f4562c7b391745bb878af))
+
+- Add Cython gotchas section to CLAUDE.md
+  ([#1679](https://github.com/python-zeroconf/python-zeroconf/pull/1679),
+  [`5cfb09d`](https://github.com/python-zeroconf/python-zeroconf/commit/5cfb09d89395cb507d436c45fc38edb9e44b94c8))
+
+- Add SECURITY.md with private vulnerability reporting policy
+  ([#1675](https://github.com/python-zeroconf/python-zeroconf/pull/1675),
+  [`13f9048`](https://github.com/python-zeroconf/python-zeroconf/commit/13f9048f0f9786ce18e89daef04073847735a006))
+
+### Testing
+
+- Add quick_timing fixture and apply to register-heavy tests
+  ([#1678](https://github.com/python-zeroconf/python-zeroconf/pull/1678),
+  [`d5e1f01`](https://github.com/python-zeroconf/python-zeroconf/commit/d5e1f01bb336ea19d982ce7d99f191723d3f18af))
+
+- Fix flaky test_run_coro_with_timeout
+  ([#1683](https://github.com/python-zeroconf/python-zeroconf/pull/1683),
+  [`277f80d`](https://github.com/python-zeroconf/python-zeroconf/commit/277f80da2c0fea5b256f981bd3f425906f6b7be6))
+
+- Pass timeout=0 explicitly in test_event_loop_blocked
+  ([#1676](https://github.com/python-zeroconf/python-zeroconf/pull/1676),
+  [`1b31ed5`](https://github.com/python-zeroconf/python-zeroconf/commit/1b31ed5fed9db1608255799701cd6f32b494952f))
+
+- Pass timeout=200 to ServiceInfo-request timeout tests
+  ([#1677](https://github.com/python-zeroconf/python-zeroconf/pull/1677),
+  [`01ef6ff`](https://github.com/python-zeroconf/python-zeroconf/commit/01ef6ffd9ff442b3cfb37d2793e0ca6ad5148832))
+
+
+## v0.148.0 (2025-10-05)
+
+### Features
+
+- Trigger semantic releases for 0.x branch
+  ([#1626](https://github.com/python-zeroconf/python-zeroconf/pull/1626),
+  [`812a2b3`](https://github.com/python-zeroconf/python-zeroconf/commit/812a2b3ff4370593a7a0c3ad67389c76c434aa9b))
+
+
+## v0.147.3 (2025-10-04)
+
+### Bug Fixes
+
+- Update poetry to v2 ([#1623](https://github.com/python-zeroconf/python-zeroconf/pull/1623),
+  [`2c3c296`](https://github.com/python-zeroconf/python-zeroconf/commit/2c3c29655bd365213a7e0a4360b8dd860d833470))
+
+
+## v0.147.2 (2025-09-05)
+
+### Bug Fixes
+
+- Missing wheel builds for Windows
+  ([#1613](https://github.com/python-zeroconf/python-zeroconf/pull/1613),
+  [`f8e2381`](https://github.com/python-zeroconf/python-zeroconf/commit/f8e2381a500c78dcefeba3772822d5d3ec5f6060))
+
+
+## v0.147.1 (2025-09-05)
+
+### Bug Fixes
+
+- Increase check time and add random wait to avoid service collisions
+  ([#1611](https://github.com/python-zeroconf/python-zeroconf/pull/1611),
+  [`8c382ee`](https://github.com/python-zeroconf/python-zeroconf/commit/8c382eedc6da80031d9a7a42f299f95f115b7e47))
+
+Co-authored-by: J. Nick Koston <nick@koston.org>
+
 
 ## v0.147.0 (2025-05-03)
 
@@ -1956,3 +2307,5 @@ Include documentation and test files in source distributions, in order to make t
 
 
 ## v0.15.1 (2014-07-10)
+
+- Initial Release
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 00000000..e64b2207
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,287 @@
+# Notes for LLM contributors
+
+A short orientation file for an LLM working in this repo. Skim
+before making changes; keep edits consistent with what's described
+here. Read [README.rst](README.rst) for the user-facing intro.
+
+## What this project is
+
+`python-zeroconf` is a pure-Python implementation of multicast DNS
+service discovery (mDNS / DNS-SD, RFC 6762 + RFC 6763). It is the
+mDNS engine behind Home Assistant and a long list of other Python
+projects that need to announce or discover services on the local
+network. Public API is exported from the top-level `zeroconf`
+package; an async API lives at `zeroconf.asyncio`.
+
+There is no external protocol owner — the on-the-wire format is
+the mDNS / DNS-SD RFCs. Behaviour changes that affect packet
+contents or timing should cite the relevant RFC section.
+
+Hot paths (`_cache`, `_dns`, `_history`, `_listener`,
+`_record_update`, `_updates`, `_protocol/{incoming,outgoing}`,
+`_handlers/*`, `_services/*`, `_utils/{ipaddress,time}`) are
+Cythonized at build time for throughput. They keep working as
+pure Python — `SKIP_CYTHON=1` disables the extension build — but
+production wheels ship compiled and CodSpeed benchmarks track that
+path. The authoritative list of cythonized modules lives in
+`build_ext.py` (`TO_CYTHONIZE`).
+
+## Code style
+
+- **Docstrings: terse, default to single-line.** A docstring is
+  the function's _contract_, not its narrative. Almost every
+  docstring should be one line — `"""Summary."""` — describing
+  what the function does and what the caller can pass. Multi-line
+  is the exception, only justified when there is non-obvious
+  caller-visible behaviour the type signature and parameter names
+  don't already convey.
+
+  **What does NOT belong in docstrings or comments:**
+  - Rationale / motivation / "why we used to do X" — that's the
+    PR description and the commit message. Git already remembers.
+  - Cross-references to issue numbers ("closes #N", "follow-up
+    to #M") — the PR body carries those.
+  - Restatement of the function body in prose. If the next line
+    of the docstring is just describing what the next line of
+    code does, delete the docstring line.
+  - Test docstrings retelling the production-side story. A test
+    docstring should name what the test pins, in one sentence —
+    not re-explain the bug, the fix, or the surrounding flow.
+
+- **Comments**: same bar. Default to writing no comments. Add
+  one only when the _why_ is non-obvious: a hidden constraint, a
+  subtle invariant, a workaround for a specific bug, behaviour
+  that would surprise a reader. RFC citations are useful when the
+  reason for a timing constant or framing decision is "the spec
+  says so" — leave those in. If removing the comment wouldn't
+  confuse a future reader, don't write it.
+
+  **Don't remove existing comments** unless the code they
+  describe is gone — the original author left them for a reason.
+
+- **Don't pad commits, docstrings, or comments with cross-
+  references** to old codepaths or issue numbers unless there's
+  a clear reason a future reader needs that link.
+
+- **Method order**: public API at the top, private helpers
+  (`_underscore_prefixed`) at the bottom. Modules whose names
+  start with `_` (`_cache`, `_dns`, `_handlers/`, etc.) are
+  internal; the supported surface is what `zeroconf/__init__.py`
+  and `zeroconf/asyncio.py` re-export.
+
+- **Line length**: 110 (ruff `line-length = 110`).
+  `requires-python = ">=3.10"`, `target-version = "py310"` for
+  ruff; pyupgrade runs `--py310-plus`.
+
+- **Imports**: ruff/isort sorted, `profile = "black"`,
+  `known_first_party = ["zeroconf", "tests"]`. Prefer
+  `from __future__ import annotations` so modern type syntax
+  works on 3.10.
+
+- **Generated `.c` files are not lint-targets.** `*.c` files
+  next to each cythonized module are Cython output — never hand-
+  edit them. They are excluded from sdist (`exclude = ["**/*.c"]`
+  in `pyproject.toml`) and regenerated by the build.
+
+## Commit / PR conventions
+
+- **Conventional Commits PR title, lowercase subject.** PRs are
+  squash-merged, so the **PR title** becomes the commit on
+  `master` and is the only string that has to parse as a
+  Conventional Commit. The repo enforces this via the `pr-title`
+  CI job in `ci.yml` using `amannn/action-semantic-pull-request`.
+  Accepted types: `feat`, `fix`, `chore`, `ci`, `docs`,
+  `refactor`, `test`, `perf`, `build`, etc. The subject (text
+  after `type(scope):`) must start lowercase (enforced by
+  `subjectPattern: ^(?![A-Z]).+$`). Per-commit messages on the
+  PR branch are **not** linted; they get collapsed at squash-
+  merge. `semantic-release` excludes `chore*` and `ci*` from the
+  changelog, so use those prefixes for housekeeping and reserve
+  `feat`/`fix`/`perf` for user-visible changes.
+- **No `Co-Authored-By` trailers from automated agents.** Project
+  preference.
+- Imperative-mood subject after the type prefix ("fix: handle
+  empty answer", not "fix: handled empty answer").
+- There is no `.github/PULL_REQUEST_TEMPLATE.md` in this repo —
+  the PR body is free-form. The `pr-workflow` skill (under
+  `.claude/skills/pr-workflow/`) walks through the conventions
+  that do apply: conventional-commit subject, RFC citations for
+  protocol-affecting changes, a test-plan section.
+- Pre-commit runs ruff (lint + format), mypy, flake8, codespell,
+  cython-lint, and pyupgrade. Run pre-commit locally before
+  pushing; the CI `lint` job is just `pre-commit/action`, so a
+  green local pre-commit run = a green CI lint job.
+
+## Running tests
+
+```bash
+poetry run pytest --durations=20 --timeout=60 -v tests
+```
+
+…or `make test`, which runs the same command. Test discovery
+defaults from `pyproject.toml` already pass `--cov=zeroconf`
+and `pythonpath = ["src"]`. `pytest-asyncio` is used in the
+default per-test mode (no auto mode); async tests are marked
+explicitly with `@pytest.mark.asyncio`.
+
+CodSpeed benchmarks live under `tests/benchmarks/` and run in CI
+through `CodSpeedHQ/action`. Ad-hoc microbenchmarks for manual
+profiling live under `bench/` — those don't run in CI.
+
+The CI matrix includes CPython 3.10 – 3.14, the free-threaded
+3.14t build, and PyPy 3.10. Don't add anything that breaks
+on the free-threaded build (no module-level mutable globals
+mutated from multiple threads without locks; no
+`PyDict_Next`-style escape hatches in Cython).
+
+## Build conventions
+
+- **Cython is optional but expected in wheels.** `build_ext.py`
+  cythonizes every module listed in `TO_CYTHONIZE`. The build is
+  driven by `poetry-core` (`generate-setup-file = true`,
+  `script = "build_ext.py"`); `BuildExt.build_extensions`
+  swallows build failures so source installs fall back to pure
+  Python. `SKIP_CYTHON=1` skips the Cython step entirely;
+  `REQUIRE_CYTHON=1` re-raises so a missing extension fails the
+  build loudly (CI wheel builds use this).
+- **Modules that get Cythonized ship a sibling `.pxd`** for type
+  declarations. When changing the signature of a Cythonized
+  function — or adding a new attribute to a `cdef class` — update
+  the `.pxd` in the same commit, or the extension will pick up a
+  stale declaration and the in-tree `.c` will be regenerated with
+  the wrong layout.
+- Adding a new module to `TO_CYTHONIZE` is a deliberate decision:
+  the module must be hot enough to matter, must not rely on
+  Python-only constructs that Cython refuses (the existing
+  `PERF401`, `PYI032`, `PYI041` ruff ignores exist because Cython
+  rejects closures and PEP 604 unions in `cpdef`), and must stay
+  free-threading-safe.
+- `compiler_directives = {"language_level": "3"}`. The build
+  pipeline does not currently set `freethreading_compatible`,
+  but the test matrix exercises 3.14t, so any new Cython module
+  needs to keep working there.
+
+## Cython gotchas
+
+Non-obvious traps in the `.py` + `.pxd` setup that work fine in
+pure-Python mode but break or silently misbehave in the shipped
+Cython wheels. Distilled from the patterns that already exist in
+this repo's `.pxd` files and from incidents in sibling Cython-
+accelerated projects.
+
+- **`cdef`-typed module constants are not Python-importable.**
+  Declaring `cdef unsigned int _ANSWER_STRATEGY_POINTER` in
+  `query_handler.pxd` makes Cython treat
+  `_ANSWER_STRATEGY_POINTER = 1` in `query_handler.py` as a C int
+  assignment; the Python module dict never gets the binding.
+  `from zeroconf._handlers.query_handler import
+_ANSWER_STRATEGY_POINTER` succeeds in pure-Python but raises
+  `ImportError` under Cython. If you need the value visible from
+  Python (e.g. a test wants to assert on it), define both names —
+  a public `ANSWER_STRATEGY_POINTER = 1` Python binding plus a
+  `cdef`-typed `_ANSWER_STRATEGY_POINTER = ANSWER_STRATEGY_POINTER`
+  alias for hot-path comparisons.
+
+- **Match the existing `unsigned int` convention for length, TTL,
+  type/class, and offset fields.** `_protocol/incoming.pxd`,
+  `_cache.pxd`, and `_handlers/*.pxd` already declare these as
+  `unsigned int` end-to-end. Introducing a `cdef int` return that
+  carries a value originally decoded into `unsigned int` flips
+  sign for any value with bit 31 set — TTL is a 32-bit DNS field
+  (RFC 1035 §3.2.1, interpreted as unsigned), so a large TTL
+  passed back through a `cdef int` boundary becomes negative and
+  trips `< 0` sentinel branches. Stay with `unsigned int` across
+  the whole call chain; if you need a real sentinel, return an
+  explicit value (`UINT_MAX`, a dedicated constant) and check for
+  it by equality.
+
+- **Module-level Python int constants force `PyLong_AsLong` on
+  every hot-path comparison.** `if record.type == _TYPE_PTR`
+  compiles to a Python attribute lookup + `PyLong_AsLong` per
+  call when `_TYPE_PTR` is just a `.py`-level binding. The repo
+  already follows the right pattern — `_cache.pxd` /
+  `record_manager.pxd` declare `cdef unsigned int _TYPE_PTR`,
+  `_DNS_PTR_MIN_TTL`, `_MIN_SCHEDULED_RECORD_EXPIRATION`, etc.
+  When adding a new size / TTL / type constant from `const.py`
+  to a `cdef` hot path in `_protocol/`, `_cache`, `_handlers/`,
+  or `_listener`, add the `cdef`-typed alias to the corresponding
+  `.pxd` at the same time.
+
+- **Sign-compare warnings in generated C are real.** `gcc`/
+  `clang` warns when comparing `unsigned int` with `int` because
+  the signed value is implicitly converted to unsigned for the
+  compare — a negative value becomes a huge positive. Match the
+  signedness of compared operands in the `.pxd` (e.g. if the
+  local is `unsigned int`, declare the constant as
+  `cdef unsigned int`; if the local is `int`, declare it
+  `cdef int`). The warning predicts the unsigned -> signed
+  overflow class of bug.
+
+- **CodSpeed regressions only show up in the Cython build.**
+  Pure-Python (`SKIP_CYTHON=1`) tests can pass while production
+  wire-format hot paths regress. Trust the CodSpeed check on PRs
+  that touch any file in `TO_CYTHONIZE`; rebuild in place with
+  `REQUIRE_CYTHON=1 poetry install --only=main,dev` before
+  pushing if perf-sensitive code changed.
+
+## Reporting security issues
+
+Suspected security vulnerabilities go through GitHub's [private
+vulnerability reporting][gh-report], not public issues or pull
+requests. The policy is spelled out in [SECURITY.md](SECURITY.md).
+If a user describes what sounds like a vulnerability in chat,
+point them at that route instead of opening a public issue, PR,
+or commit that names the bug class and the affected code path.
+
+[gh-report]: https://github.com/python-zeroconf/python-zeroconf/security/advisories/new
+
+## Useful entry points
+
+| Path                             | What                                                                           |
+| -------------------------------- | ------------------------------------------------------------------------------ |
+| `src/zeroconf/__init__.py`       | Public package — re-exports `Zeroconf`, `ServiceBrowser`, `ServiceInfo`, etc.  |
+| `src/zeroconf/asyncio.py`        | Async API: `AsyncZeroconf`, `AsyncServiceBrowser`, `AsyncZeroconfServiceTypes` |
+| `src/zeroconf/_core.py`          | `Zeroconf` core — socket setup, send/recv loop, registration/probing           |
+| `src/zeroconf/_engine.py`        | Asyncio engine driving the listener                                            |
+| `src/zeroconf/_listener.py`      | Cython-accelerated packet listener                                             |
+| `src/zeroconf/_cache.py`         | DNS record cache (Cythonized)                                                  |
+| `src/zeroconf/_dns.py`           | DNS record / question classes (Cythonized)                                     |
+| `src/zeroconf/_history.py`       | Outgoing-question history for known-answer suppression                         |
+| `src/zeroconf/_record_update.py` | Record-update dataclass passed to listeners                                    |
+| `src/zeroconf/_protocol/`        | `DNSIncoming` / `DNSOutgoing` wire codec (Cythonized)                          |
+| `src/zeroconf/_handlers/`        | Query / answer / multicast queueing (Cythonized)                               |
+| `src/zeroconf/_services/`        | `ServiceBrowser`, `ServiceInfo`, `ServiceRegistry`, types                      |
+| `src/zeroconf/_updates.py`       | `RecordUpdateListener` base class (Cythonized)                                 |
+| `src/zeroconf/_utils/`           | `ipaddress`, `time`, `net`, `name`, `asyncio` helpers                          |
+| `src/zeroconf/const.py`          | Timeouts, intervals, multicast group constants                                 |
+| `src/zeroconf/_exceptions.py`    | Public exception hierarchy                                                     |
+| `tests/`                         | Pytest suite                                                                   |
+| `tests/benchmarks/`              | CodSpeed benchmarks                                                            |
+| `bench/`                         | Manual microbenchmarks (not run in CI)                                         |
+| `build_ext.py`                   | `TO_CYTHONIZE` list + `poetry-core` build hook                                 |
+
+## Things not to do
+
+- **Don't hand-edit the generated `.c` files** next to Cythonized
+  modules. They are build output; modify the `.py` (and `.pxd`)
+  and let Cython regenerate.
+- **Don't change a Cythonized module's `cdef class` layout or a
+  `cpdef`/`cdef` signature without updating its `.pxd`** — the
+  extension build will silently pick up a stale declaration and
+  the resulting wheel will crash at import time.
+- **Don't add `Co-Authored-By` trailers from automated agents
+  to commits** in this repo.
+- **Don't introduce a PR title that violates Conventional
+  Commits.** The `pr-title` job will fail the PR.
+- **Don't tighten timings or constants in `const.py` without an
+  RFC citation in the commit message.** mDNS interop with
+  Avahi / Bonjour / Windows hinges on those numbers.
+- **Don't bypass `BuildExt`'s exception swallowing in
+  `build_ext.py` without thought.** Pure-Python fallback is a
+  feature for source installs on platforms without a compiler
+  (and for the PyPy matrix entries, which never load the C
+  extensions).
+- **Don't break the free-threaded test matrix entry (`3.14t`).**
+  CPython 3.14t exercises this code without the GIL; module-
+  level mutable state and unguarded cross-thread Cython attribute
+  access will surface as flakiness there before anywhere else.
diff --git a/README.rst b/README.rst
index c27833f8..08d48822 100644
--- a/README.rst
+++ b/README.rst
@@ -53,8 +53,8 @@ Compared to some other Zeroconf/Bonjour/Avahi Python packages, python-zeroconf:
 Python compatibility
 --------------------
 
-* CPython 3.9+
-* PyPy 3.9+
+* CPython 3.10+
+* PyPy 3.10+
 
 Versioning
 ----------
@@ -151,4 +151,10 @@ Changelog
 License
 =======
 
-LGPL, see COPYING file for details.
+GNU Lesser General Public License v2.1 or later (LGPL-2.1-or-later).
+
+The full text of LGPL 2.1 is included in the `COPYING <COPYING>`_ file.
+You may, at your option, use this library under the terms of any later
+version of the LGPL published by the Free Software Foundation. The
+canonical SPDX identifier for this project is ``LGPL-2.1-or-later``, as
+declared in ``pyproject.toml``.
diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 00000000..5dee00d6
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,52 @@
+# Security Policy
+
+## Reporting a vulnerability
+
+Please report security vulnerabilities privately through GitHub's
+[private vulnerability reporting][gh-report] for this repository.
+That route sends the report directly to the maintainers and lets
+us coordinate a fix, a CVE, and a release before public
+disclosure.
+
+**Do not** open a regular GitHub issue, a pull request, or post
+to a public channel (mailing list, chat room, Stack Overflow,
+etc.) for a suspected vulnerability. If you are unsure whether
+something is a vulnerability, use the private report — we would
+rather see a false alarm than a public one.
+
+We aim to acknowledge new reports within a few business days.
+
+[gh-report]: https://github.com/python-zeroconf/python-zeroconf/security/advisories/new
+
+## Supported versions
+
+Security fixes are released against the latest `0.x` line on
+PyPI. Older releases are not maintained — please upgrade to the
+current release before reporting, and confirm the issue still
+reproduces there.
+
+## Scope
+
+`python-zeroconf` is an mDNS / DNS-SD library. By design it
+parses untrusted multicast traffic from the local network
+(RFC 6762, RFC 6763). In-scope issues include:
+
+- Memory-safety, parsing, or denial-of-service issues triggered
+  by crafted mDNS / DNS-SD packets reaching `DNSIncoming`, the
+  record cache, the service registry, or listener callbacks.
+- Logic bugs that cause the library to answer queries it should
+  not, leak information across interfaces, or hijack a service
+  name from another responder in a way the RFCs don't sanction.
+- Issues in the build / packaging pipeline (`build_ext.py`,
+  wheel contents, signed-release flow) that could lead to a
+  compromised wheel on PyPI.
+
+Out of scope:
+
+- Risks inherent to running an mDNS responder on an untrusted
+  network — mDNS is unauthenticated by design (RFC 6762 §21).
+  Reports of the form "a malicious LAN peer can send packets"
+  are expected behaviour unless they cross one of the lines
+  above.
+- Misconfiguration of a downstream application that uses the
+  library.
diff --git a/build_ext.py b/build_ext.py
index ff088f83..f77d3e2e 100644
--- a/build_ext.py
+++ b/build_ext.py
@@ -46,6 +46,8 @@
 
 class BuildExt(build_ext):
     def build_extensions(self) -> None:
+        if self.parallel is None:  # type: ignore[has-type]
+            self.parallel = os.cpu_count() or 1
         try:
             super().build_extensions()
         except Exception:
@@ -56,7 +58,7 @@ def build(setup_kwargs: Any) -> None:
     if os.environ.get("SKIP_CYTHON"):
         return
     try:
-        from Cython.Build import cythonize
+        from Cython.Build import cythonize  # noqa: PLC0415
 
         setup_kwargs.update(
             {
diff --git a/commitlint.config.mjs b/commitlint.config.mjs
deleted file mode 100644
index deb029ab..00000000
--- a/commitlint.config.mjs
+++ /dev/null
@@ -1,8 +0,0 @@
-export default {
-  extends: ["@commitlint/config-conventional"],
-  rules: {
-    "header-max-length": [0, "always", Infinity],
-    "body-max-line-length": [0, "always", Infinity],
-    "footer-max-line-length": [0, "always", Infinity],
-  },
-};
diff --git a/poetry.lock b/poetry.lock
index 950e3cbd..9215b275 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 2.1.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.2.1 and should not be changed by hand.
 
 [[package]]
 name = "alabaster"
@@ -28,96 +28,44 @@ files = [
 dev = ["backports.zoneinfo ; python_version < \"3.9\"", "freezegun (>=1.0,<2.0)", "jinja2 (>=3.0)", "pytest (>=6.0)", "pytest-cov", "pytz", "setuptools", "tzdata ; sys_platform == \"win32\""]
 
 [[package]]
-name = "certifi"
-version = "2025.1.31"
-description = "Python package for providing Mozilla's CA Bundle."
+name = "backports-asyncio-runner"
+version = "1.2.0"
+description = "Backport of asyncio.Runner, a context manager that controls event loop life cycle."
 optional = false
-python-versions = ">=3.6"
-groups = ["docs"]
+python-versions = "<3.11,>=3.8"
+groups = ["dev"]
+markers = "python_version == \"3.10\""
 files = [
-    {file = "certifi-2025.1.31-py3-none-any.whl", hash = "sha256:ca78db4565a652026a4db2bcdf68f2fb589ea80d0be70e03929ed730746b84fe"},
-    {file = "certifi-2025.1.31.tar.gz", hash = "sha256:3d5da6925056f6f18f119200434a4780a94263f10d1c21d032a6f6b2baa20651"},
+    {file = "backports_asyncio_runner-1.2.0-py3-none-any.whl", hash = "sha256:0da0a936a8aeb554eccb426dc55af3ba63bcdc69fa1a600b5bb305413a4477b5"},
+    {file = "backports_asyncio_runner-1.2.0.tar.gz", hash = "sha256:a5aa7b2b7d8f8bfcaa2b57313f70792df84e32a2a746f585213373f900b42162"},
 ]
 
 [[package]]
-name = "cffi"
-version = "1.17.1"
-description = "Foreign Function Interface for Python calling C code."
+name = "blockbuster"
+version = "1.5.26"
+description = "Utility to detect blocking calls in the async event loop"
 optional = false
 python-versions = ">=3.8"
 groups = ["dev"]
 files = [
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 ]
 
 [[package]]
@@ -406,7 +354,7 @@ description = "Backport of PEP 654 (exception groups)"
 optional = false
 python-versions = ">=3.7"
 groups = ["dev"]
-markers = "python_version < \"3.11\""
+markers = "python_version == \"3.10\""
 files = [
     {file = "exceptiongroup-1.2.2-py3-none-any.whl", hash = "sha256:3111b9d131c238bec2f8f516e123e14ba243563fb135d3fe885990585aa7795b"},
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@@ -415,20 +363,32 @@ files = [
 [package.extras]
 test = ["pytest (>=6)"]
 
+[[package]]
+name = "forbiddenfruit"
+version = "0.1.4"
+description = "Patch python built-in objects"
+optional = false
+python-versions = "*"
+groups = ["dev"]
+markers = "implementation_name == \"cpython\""
+files = [
+    {file = "forbiddenfruit-0.1.4.tar.gz", hash = "sha256:e3f7e66561a29ae129aac139a85d610dbf3dd896128187ed5454b6421f624253"},
+]
+
 [[package]]
 name = "idna"
-version = "3.10"
+version = "3.15"
 description = "Internationalized Domain Names in Applications (IDNA)"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.8"
 groups = ["docs"]
 files = [
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+    {file = "idna-3.15-py3-none-any.whl", hash = "sha256:048adeaf8c2d788c40fee287673ccaa74c24ffd8dcf09ffa555a2fbb59f10ac8"},
+    {file = "idna-3.15.tar.gz", hash = "sha256:ca962446ea538f7092a95e057da437618e886f4d349216d2b1e294abfdb65fdc"},
 ]
 
 [package.extras]
-all = ["flake8 (>=7.1.1)", "mypy (>=1.11.2)", "pytest (>=8.3.2)", "ruff (>=0.6.2)"]
+all = ["mypy (>=1.11.2)", "pytest (>=8.3.2)", "ruff (>=0.6.2)"]
 
 [[package]]
 name = "ifaddr"
@@ -454,31 +414,6 @@ files = [
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 ]
 
-[[package]]
-name = "importlib-metadata"
-version = "8.6.1"
-description = "Read metadata from Python packages"
-optional = false
-python-versions = ">=3.9"
-groups = ["dev", "docs"]
-markers = "python_version < \"3.10\""
-files = [
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-
-[package.dependencies]
-zipp = ">=3.20"
-
-[package.extras]
-check = ["pytest-checkdocs (>=2.4)", "pytest-ruff (>=0.2.1) ; sys_platform != \"cygwin\""]
-cover = ["pytest-cov"]
-doc = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-lint"]
-enabler = ["pytest-enabler (>=2.2)"]
-perf = ["ipython"]
-test = ["flufl.flake8", "importlib_resources (>=1.3) ; python_version < \"3.9\"", "jaraco.test (>=5.4)", "packaging", "pyfakefs", "pytest (>=6,!=8.1.*)", "pytest-perf (>=0.9.2)"]
-type = ["pytest-mypy"]
-
 [[package]]
 name = "iniconfig"
 version = "2.0.0"
@@ -645,18 +580,6 @@ files = [
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
 
-[[package]]
-name = "pycparser"
-version = "2.22"
-description = "C parser in Python"
-optional = false
-python-versions = ">=3.8"
-groups = ["dev"]
-files = [
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-]
-
 [[package]]
 name = "pygments"
 version = "2.19.1"
@@ -674,42 +597,44 @@ windows-terminal = ["colorama (>=0.4.6)"]
 
 [[package]]
 name = "pytest"
-version = "8.3.5"
+version = "9.0.3"
 description = "pytest: simple powerful testing with Python"
 optional = false
-python-versions = ">=3.8"
+python-versions = ">=3.10"
 groups = ["dev"]
 files = [
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+    {file = "pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c"},
 ]
 
 [package.dependencies]
-colorama = {version = "*", markers = "sys_platform == \"win32\""}
-exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
-iniconfig = "*"
-packaging = "*"
+colorama = {version = ">=0.4", markers = "sys_platform == \"win32\""}
+exceptiongroup = {version = ">=1", markers = "python_version < \"3.11\""}
+iniconfig = ">=1.0.1"
+packaging = ">=22"
 pluggy = ">=1.5,<2"
+pygments = ">=2.7.2"
 tomli = {version = ">=1", markers = "python_version < \"3.11\""}
 
 [package.extras]
-dev = ["argcomplete", "attrs (>=19.2)", "hypothesis (>=3.56)", "mock", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
+dev = ["argcomplete", "attrs (>=19.2)", "hypothesis (>=3.56)", "mock", "requests", "setuptools", "xmlschema"]
 
 [[package]]
 name = "pytest-asyncio"
-version = "0.26.0"
+version = "1.3.0"
 description = "Pytest support for asyncio"
 optional = false
-python-versions = ">=3.9"
+python-versions = ">=3.10"
 groups = ["dev"]
 files = [
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+    {file = "pytest_asyncio-1.3.0.tar.gz", hash = "sha256:d7f52f36d231b80ee124cd216ffb19369aa168fc10095013c6b014a34d3ee9e5"},
 ]
 
 [package.dependencies]
-pytest = ">=8.2,<9"
-typing-extensions = {version = ">=4.12", markers = "python_version < \"3.10\""}
+backports-asyncio-runner = {version = ">=1.1,<2", markers = "python_version < \"3.11\""}
+pytest = ">=8.2,<10"
+typing-extensions = {version = ">=4.12", markers = "python_version < \"3.13\""}
 
 [package.extras]
 docs = ["sphinx (>=5.3)", "sphinx-rtd-theme (>=1)"]
@@ -717,66 +642,80 @@ testing = ["coverage (>=6.2)", "hypothesis (>=5.7.1)"]
 
 [[package]]
 name = "pytest-codspeed"
-version = "3.2.0"
+version = "5.0.2"
 description = "Pytest plugin to create CodSpeed benchmarks"
 optional = false
 python-versions = ">=3.9"
 groups = ["dev"]
 files = [
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 pytest = ">=3.8"
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-test = ["pytest (>=7.0,<8.0)", "pytest-cov (>=4.0.0,<4.1.0)"]
 
 [[package]]
 name = "pytest-cov"
-version = "6.1.1"
+version = "7.1.0"
 description = "Pytest plugin for measuring coverage."
 optional = false
 python-versions = ">=3.9"
 groups = ["dev"]
 files = [
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 ]
 
 [package.dependencies]
-coverage = {version = ">=7.5", extras = ["toml"]}
-pytest = ">=4.6"
+coverage = {version = ">=7.10.6", extras = ["toml"]}
+pluggy = ">=1.2"
+pytest = ">=7"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests", "pytest-xdist", "virtualenv"]
+testing = ["process-tests", "pytest-xdist", "virtualenv"]
 
 [[package]]
 name = "pytest-timeout"
-version = "2.3.1"
+version = "2.4.0"
 description = "pytest plugin to abort hanging tests"
 optional = false
 python-versions = ">=3.7"
 groups = ["dev"]
 files = [
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 ]
 
 [package.dependencies]
@@ -784,25 +723,26 @@ pytest = ">=7.0.0"
 
 [[package]]
 name = "requests"
-version = "2.32.3"
+version = "2.33.0"
 description = "Python HTTP for Humans."
 optional = false
-python-versions = ">=3.8"
+python-versions = ">=3.10"
 groups = ["docs"]
 files = [
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 ]
 
 [package.dependencies]
-certifi = ">=2017.4.17"
-charset-normalizer = ">=2,<4"
+certifi = ">=2023.5.7"
+charset_normalizer = ">=2,<4"
 idna = ">=2.5,<4"
-urllib3 = ">=1.21.1,<3"
+urllib3 = ">=1.26,<3"
 
 [package.extras]
 socks = ["PySocks (>=1.5.6,!=1.5.7)"]
-use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
+test = ["PySocks (>=1.5.6,!=1.5.7)", "pytest (>=3)", "pytest-cov", "pytest-httpbin (==2.1.0)", "pytest-mock", "pytest-xdist"]
+use-chardet-on-py3 = ["chardet (>=3.0.2,<8)"]
 
 [[package]]
 name = "rich"
@@ -826,24 +766,24 @@ jupyter = ["ipywidgets (>=7.5.1,<9)"]
 
 [[package]]
 name = "setuptools"
-version = "80.3.1"
-description = "Easily download, build, install, upgrade, and uninstall Python packages"
+version = "82.0.1"
+description = "Most extensible Python build backend with support for C/C++ extension modules"
 optional = false
 python-versions = ">=3.9"
 groups = ["dev"]
 files = [
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 [package.extras]
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+check = ["pytest-checkdocs (>=2.4)", "pytest-ruff (>=0.2.1) ; sys_platform != \"cygwin\"", "ruff (>=0.13.0) ; sys_platform != \"cygwin\""]
+core = ["importlib_metadata (>=6) ; python_version < \"3.10\"", "jaraco.functools (>=4)", "jaraco.text (>=3.7)", "more_itertools", "more_itertools (>=8.8)", "packaging (>=24.2)", "tomli (>=2.0.1) ; python_version < \"3.11\"", "wheel (>=0.43.0)"]
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+type = ["importlib_metadata (>=7.0.2) ; python_version < \"3.10\"", "jaraco.develop (>=7.21) ; sys_platform != \"cygwin\"", "mypy (==1.18.*)", "pytest-mypy"]
 
 [[package]]
 name = "snowballstemmer"
@@ -859,56 +799,55 @@ files = [
 
 [[package]]
 name = "sphinx"
-version = "7.4.7"
+version = "8.1.3"
 description = "Python documentation generator"
 optional = false
-python-versions = ">=3.9"
+python-versions = ">=3.10"
 groups = ["docs"]
 files = [
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 docutils = ">=0.20,<0.22"
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 requests = ">=2.30.0"
 snowballstemmer = ">=2.2"
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-sphinxcontrib-devhelp = "*"
-sphinxcontrib-htmlhelp = ">=2.0.0"
-sphinxcontrib-jsmath = "*"
-sphinxcontrib-qthelp = "*"
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+sphinxcontrib-devhelp = ">=1.0.6"
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+sphinxcontrib-qthelp = ">=1.0.6"
 sphinxcontrib-serializinghtml = ">=1.1.9"
 tomli = {version = ">=2", markers = "python_version < \"3.11\""}
 
 [package.extras]
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+lint = ["flake8 (>=6.0)", "mypy (==1.11.1)", "pyright (==1.1.384)", "pytest (>=6.0)", "ruff (==0.6.9)", "sphinx-lint (>=0.9)", "tomli (>=2)", "types-Pillow (==10.2.0.20240822)", "types-Pygments (==2.18.0.20240506)", "types-colorama (==0.4.15.20240311)", "types-defusedxml (==0.7.0.20240218)", "types-docutils (==0.21.0.20241005)", "types-requests (==2.32.0.20240914)", "types-urllib3 (==1.26.25.14)"]
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 [[package]]
 name = "sphinx-rtd-theme"
-version = "3.0.2"
+version = "3.1.0"
 description = "Read the Docs theme for Sphinx"
 optional = false
 python-versions = ">=3.8"
 groups = ["docs"]
 files = [
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 ]
 
 [package.dependencies]
-docutils = ">0.18,<0.22"
-sphinx = ">=6,<9"
+docutils = ">0.18,<0.23"
+sphinx = ">=6,<10"
 sphinxcontrib-jquery = ">=4,<5"
 
 [package.extras]
@@ -1070,7 +1009,7 @@ files = [
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 ]
-markers = {dev = "python_full_version <= \"3.11.0a6\"", docs = "python_version < \"3.11\""}
+markers = {dev = "python_full_version <= \"3.11.0a6\"", docs = "python_version == \"3.10\""}
 
 [[package]]
 name = "typing-extensions"
@@ -1079,7 +1018,7 @@ description = "Backported and Experimental Type Hints for Python 3.8+"
 optional = false
 python-versions = ">=3.8"
 groups = ["dev"]
-markers = "python_version < \"3.11\""
+markers = "python_version < \"3.13\""
 files = [
     {file = "typing_extensions-4.12.2-py3-none-any.whl", hash = "sha256:04e5ca0351e0f3f85c6853954072df659d0d13fac324d0072316b67d7794700d"},
     {file = "typing_extensions-4.12.2.tar.gz", hash = "sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8"},
@@ -1087,44 +1026,23 @@ files = [
 
 [[package]]
 name = "urllib3"
-version = "2.3.0"
+version = "2.7.0"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 optional = false
-python-versions = ">=3.9"
+python-versions = ">=3.10"
 groups = ["docs"]
 files = [
-    {file = "urllib3-2.3.0-py3-none-any.whl", hash = "sha256:1cee9ad369867bfdbbb48b7dd50374c0967a0bb7710050facf0dd6911440e3df"},
-    {file = "urllib3-2.3.0.tar.gz", hash = "sha256:f8c5449b3cf0861679ce7e0503c7b44b5ec981bec0d1d3795a07f1ba96f0204d"},
+    {file = "urllib3-2.7.0-py3-none-any.whl", hash = "sha256:9fb4c81ebbb1ce9531cce37674bbc6f1360472bc18ca9a553ede278ef7276897"},
+    {file = "urllib3-2.7.0.tar.gz", hash = "sha256:231e0ec3b63ceb14667c67be60f2f2c40a518cb38b03af60abc813da26505f4c"},
 ]
 
 [package.extras]
-brotli = ["brotli (>=1.0.9) ; platform_python_implementation == \"CPython\"", "brotlicffi (>=0.8.0) ; platform_python_implementation != \"CPython\""]
+brotli = ["brotli (>=1.2.0) ; platform_python_implementation == \"CPython\"", "brotlicffi (>=1.2.0.0) ; platform_python_implementation != \"CPython\""]
 h2 = ["h2 (>=4,<5)"]
 socks = ["pysocks (>=1.5.6,!=1.5.7,<2.0)"]
-zstd = ["zstandard (>=0.18.0)"]
-
-[[package]]
-name = "zipp"
-version = "3.21.0"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-optional = false
-python-versions = ">=3.9"
-groups = ["dev", "docs"]
-markers = "python_version < \"3.10\""
-files = [
-    {file = "zipp-3.21.0-py3-none-any.whl", hash = "sha256:ac1bbe05fd2991f160ebce24ffbac5f6d11d83dc90891255885223d42b3cd931"},
-    {file = "zipp-3.21.0.tar.gz", hash = "sha256:2c9958f6430a2040341a52eb608ed6dd93ef4392e02ffe219417c1b28b5dd1f4"},
-]
-
-[package.extras]
-check = ["pytest-checkdocs (>=2.4)", "pytest-ruff (>=0.2.1) ; sys_platform != \"cygwin\""]
-cover = ["pytest-cov"]
-doc = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-lint"]
-enabler = ["pytest-enabler (>=2.2)"]
-test = ["big-O", "importlib-resources ; python_version < \"3.9\"", "jaraco.functools", "jaraco.itertools", "jaraco.test", "more-itertools", "pytest (>=6,!=8.1.*)", "pytest-ignore-flaky"]
-type = ["pytest-mypy"]
+zstd = ["backports-zstd (>=1.0.0) ; python_version < \"3.14\""]
 
 [metadata]
 lock-version = "2.1"
-python-versions = "^3.9"
-content-hash = "972988da838067a7f2d12b8212ce54ba946cb38a4f63576a520dd1ed40ac3e9b"
+python-versions = "^3.10"
+content-hash = "c0d62f11cb94761d233c73a46ff3f626640ae3ef3af9a2ece9f37095a47d4c71"
diff --git a/pyproject.toml b/pyproject.toml
index d47a1966..67badccf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,12 +1,28 @@
-[tool.poetry]
+[build-system]
+requires = ['setuptools>=77.0', 'Cython>=3.0.8', "poetry-core>=2.1.0"]
+build-backend = "poetry.core.masonry.api"
+
+[project]
 name = "zeroconf"
-version = "0.147.0"
-description = "A pure python implementation of multicast DNS service discovery"
-authors = ["Paul Scott-Murphy", "William McBrine", "Jakub Stasiak", "J. Nick Koston"]
+version = "0.149.16"
 license = "LGPL-2.1-or-later"
+description = "A pure python implementation of multicast DNS service discovery"
 readme = "README.rst"
-repository = "https://github.com/python-zeroconf/python-zeroconf"
-documentation = "https://python-zeroconf.readthedocs.io"
+authors = [
+    { name = "Paul Scott-Murphy" },
+    { name = "William McBrine" },
+    { name = "Jakub Stasiak" },
+    { name = "J. Nick Koston" },
+]
+requires-python = ">=3.10"
+
+[project.urls]
+"Repository" = "https://github.com/python-zeroconf/python-zeroconf"
+"Documentation" = "https://python-zeroconf.readthedocs.io"
+"Bug Tracker" = "https://github.com/python-zeroconf/python-zeroconf/issues"
+"Changelog" = "https://github.com/python-zeroconf/python-zeroconf/blob/master/CHANGELOG.md"
+
+[tool.poetry]
 classifiers=[
 	'Development Status :: 5 - Production/Stable',
 	'Intended Audience :: Developers',
@@ -15,11 +31,6 @@ classifiers=[
 	'Operating System :: POSIX :: Linux',
 	'Operating System :: MacOS :: MacOS X',
 	'Topic :: Software Development :: Libraries',
-	'Programming Language :: Python :: 3.9',
-	'Programming Language :: Python :: 3.10',
-	'Programming Language :: Python :: 3.11',
-	'Programming Language :: Python :: 3.12',
-	'Programming Language :: Python :: 3.13',
 	'Programming Language :: Python :: Implementation :: CPython',
 	'Programming Language :: Python :: Implementation :: PyPy',
 ]
@@ -35,22 +46,19 @@ include = [
 # Make sure we don't package temporary C files generated by the build process
 exclude = [ "**/*.c" ]
 
-[tool.poetry.urls]
-"Bug Tracker" = "https://github.com/python-zeroconf/python-zeroconf/issues"
-"Changelog" = "https://github.com/python-zeroconf/python-zeroconf/blob/master/CHANGELOG.md"
-
 [tool.poetry.build]
 generate-setup-file = true
 script = "build_ext.py"
 
 [tool.semantic_release]
 branch = "master"
-version_toml = ["pyproject.toml:tool.poetry.version"]
+version_toml = ["pyproject.toml:project.version"]
 version_variables = [
     "src/zeroconf/__init__.py:__version__"
 ]
 build_command = "pip install poetry && poetry build"
 tag_format = "{version}"
+allow_zero_version = true
 
 [tool.semantic_release.changelog]
 exclude_commit_patterns = [
@@ -64,29 +72,33 @@ keep_trailing_newline = true
 [tool.semantic_release.branches.master]
 match = "master"
 
+[tool.semantic_release.branches."release-0.x"]
+match = "release-0.x"
+
 [tool.semantic_release.branches.noop]
-match = "(?!master$)"
+match = "(?!(master|release-0.x)$)"
 prerelease = true
 
 [tool.poetry.dependencies]
-python = "^3.9"
+python = "^3.10"
 ifaddr = ">=0.1.7"
 
 [tool.poetry.group.dev.dependencies]
-pytest = ">=7.2,<9.0"
-pytest-cov = ">=4,<7"
-pytest-asyncio = ">=0.20.3,<0.27.0"
-cython = "^3.0.5"
-setuptools = ">=65.6.3,<81.0.0"
+pytest = ">=9.0.3,<10.0"
+pytest-cov = ">=4,<8"
+pytest-asyncio = ">=1.3.0,<1.4.0"
+cython = "^3.2.4"
+setuptools = ">=65.6.3,<83.0.0"
 pytest-timeout = "^2.1.0"
-pytest-codspeed = "^3.1.0"
+pytest-codspeed = ">=5.0.2,<6.0"
+blockbuster = ">=1.5.5,<2.0.0"
 
 [tool.poetry.group.docs.dependencies]
 sphinx = "^7.4.7 || ^8.1.3"
-sphinx-rtd-theme = "^3.0.2"
+sphinx-rtd-theme = "^3.1.0"
 
 [tool.ruff]
-target-version = "py39"
+target-version = "py310"
 line-length = 110
 
 [tool.ruff.lint]
@@ -150,21 +162,16 @@ select = [
     "SLF001",
     "PLR2004", # too many to fix right now
     "PT011", # too many to fix right now
-    "PT006", # too many to fix right now
     "PGH003", # too many to fix right now
-    "PT007", # too many to fix right now
     "PT027",  # too many to fix right now
     "PLW0603" , # too many to fix right now
     "PLR0915", # too many to fix right now
     "FLY002", # too many to fix right now
     "PT018", # too many to fix right now
     "PLR0124", # too many to fix right now
-    "SIM202" , # too many to fix right now
     "PT012" , # too many to fix right now
     "TID252", # too many to fix right now
     "PLR0913", # skip this one
-    "SIM102" , # too many to fix right now
-    "SIM108", # too many to fix right now
     "T201", # too many to fix right now
     "PT004", # nice to have
 ]
@@ -266,11 +273,6 @@ allow_untyped_defs = true
 module = "bench.*"
 ignore_errors = true
 
-[build-system]
-# 1.5.2 required for https://github.com/python-poetry/poetry/issues/7505
-requires = ['setuptools>=65.4.1', 'wheel', 'Cython>=3.0.8', "poetry-core>=1.5.2"]
-build-backend = "poetry.core.masonry.api"
-
 [tool.codespell]
 ignore-words-list = ["additionals", "HASS"]
 
diff --git a/src/zeroconf/__init__.py b/src/zeroconf/__init__.py
index 439ffceb..5b79402c 100644
--- a/src/zeroconf/__init__.py
+++ b/src/zeroconf/__init__.py
@@ -88,7 +88,7 @@
 
 __author__ = "Paul Scott-Murphy, William McBrine"
 __maintainer__ = "Jakub Stasiak <jakub@stasiak.at>"
-__version__ = "0.147.0"
+__version__ = "0.149.16"
 __license__ = "LGPL"
 
 
diff --git a/src/zeroconf/_cache.pxd b/src/zeroconf/_cache.pxd
index 05a40c0f..023304bc 100644
--- a/src/zeroconf/_cache.pxd
+++ b/src/zeroconf/_cache.pxd
@@ -19,6 +19,7 @@ cdef object _UNIQUE_RECORD_TYPES
 cdef unsigned int _TYPE_PTR
 cdef cython.uint _ONE_SECOND
 cdef unsigned int _MIN_SCHEDULED_RECORD_EXPIRATION
+cdef unsigned int _MAX_CACHE_RECORDS
 
 
 @cython.locals(record_cache=dict)
@@ -31,6 +32,7 @@ cdef class DNSCache:
     cdef public cython.dict service_cache
     cdef public list _expire_heap
     cdef public dict _expirations
+    cdef public unsigned int _total_records
 
     cpdef bint async_add_records(self, object entries)
 
@@ -60,10 +62,17 @@ cdef class DNSCache:
         service_store=cython.dict,
         service_record=DNSService,
         when=object,
-        new=bint
+        new=bint,
+        is_new=bint
     )
     cdef bint _async_add(self, DNSRecord record)
 
+    @cython.locals(record=DNSRecord, when_record=tuple)
+    cdef void _async_evict_oldest(self)
+
+    @cython.locals(expire_heap_len="unsigned int")
+    cdef void _maybe_rebuild_heap(self)
+
     @cython.locals(service_record=DNSService)
     cdef void _async_remove(self, DNSRecord record)
 
diff --git a/src/zeroconf/_cache.py b/src/zeroconf/_cache.py
index c7ca8472..df60982b 100644
--- a/src/zeroconf/_cache.py
+++ b/src/zeroconf/_cache.py
@@ -24,7 +24,7 @@
 
 from collections.abc import Iterable
 from heapq import heapify, heappop, heappush
-from typing import Union, cast
+from typing import cast
 
 from ._dns import (
     DNSAddress,
@@ -37,10 +37,10 @@
     DNSText,
 )
 from ._utils.time import current_time_millis
-from .const import _ONE_SECOND, _TYPE_PTR
+from .const import _MAX_CACHE_RECORDS, _ONE_SECOND, _TYPE_PTR
 
 _UNIQUE_RECORD_TYPES = (DNSAddress, DNSHinfo, DNSPointer, DNSText, DNSService)
-_UniqueRecordsType = Union[DNSAddress, DNSHinfo, DNSPointer, DNSText, DNSService]
+_UniqueRecordsType = DNSAddress | DNSHinfo | DNSPointer | DNSText | DNSService
 _DNSRecordCacheType = dict[str, dict[DNSRecord, DNSRecord]]
 _DNSRecord = DNSRecord
 _str = str
@@ -72,6 +72,7 @@ def __init__(self) -> None:
         self._expire_heap: list[tuple[float, DNSRecord]] = []
         self._expirations: dict[DNSRecord, float] = {}
         self.service_cache: _DNSRecordCacheType = {}
+        self._total_records: int = 0
 
     # Functions prefixed with async_ are NOT threadsafe and must
     # be run in the event loop.
@@ -89,15 +90,34 @@ def _async_add(self, record: _DNSRecord) -> bool:
         # replaces any existing records that are __eq__ to each other which
         # removes the risk that accessing the cache from the wrong
         # direction would return the old incorrect entry.
-        if (store := self.cache.get(record.key)) is None:
+        store = self.cache.get(record.key)
+        is_new = store is None or record not in store
+        # Bound total cache size; evict closest-to-expiration entry to
+        # make room before inserting a new record. Prevents a LAN-local
+        # flood of unique-name records from growing the cache without
+        # bound (RFC 6762 §10 advisory caching, defense-in-depth).
+        if is_new and self._total_records >= _MAX_CACHE_RECORDS:
+            self._async_evict_oldest()
+            # The victim may have been the last record under
+            # ``record.key``, in which case ``_remove_key`` deleted
+            # the bucket. Re-fetch before creating below.
+            store = self.cache.get(record.key)
+        if store is None:
             store = self.cache[record.key] = {}
-        new = record not in store and not isinstance(record, DNSNsec)
+        new = is_new and not isinstance(record, DNSNsec)
+        if is_new:
+            self._total_records += 1
         store[record] = record
         when = record.created + (record.ttl * 1000)
         if self._expirations.get(record) != when:
-            # Avoid adding duplicates to the heap
             heappush(self._expire_heap, (when, record))
             self._expirations[record] = when
+            # Re-adds of an existing record with a new TTL push a fresh
+            # entry but leave the prior tuple behind as stale, so a peer
+            # that just replays cached records can grow ``_expire_heap``
+            # without ever tripping the cap. Rebuild when stale entries
+            # dominate.
+            self._maybe_rebuild_heap()
 
         if isinstance(record, DNSService):
             service_record = record
@@ -106,6 +126,28 @@ def _async_add(self, record: _DNSRecord) -> bool:
             service_store[service_record] = service_record
         return new
 
+    def _async_evict_oldest(self) -> None:
+        """Drop the closest-to-expiration record to make room for a new one."""
+        while self._expire_heap:
+            when_record = heappop(self._expire_heap)
+            record = when_record[1]
+            if self._expirations.get(record) != when_record[0]:
+                continue
+            self._async_remove(record)
+            return
+
+    def _maybe_rebuild_heap(self) -> None:
+        """Rebuild ``_expire_heap`` when stale entries dominate live ones."""
+        expire_heap_len = len(self._expire_heap)
+        if (
+            expire_heap_len > _MIN_SCHEDULED_RECORD_EXPIRATION
+            and expire_heap_len > len(self._expirations) * 2
+        ):
+            self._expire_heap = [
+                entry for entry in self._expire_heap if self._expirations.get(entry[1]) == entry[0]
+            ]
+            heapify(self._expire_heap)
+
     def async_add_records(self, entries: Iterable[DNSRecord]) -> bool:
         """Add multiple records.
 
@@ -129,6 +171,7 @@ def _async_remove(self, record: _DNSRecord) -> None:
             _remove_key(self.service_cache, service_record.server_key, service_record)
         _remove_key(self.cache, record.key, record)
         self._expirations.pop(record, None)
+        self._total_records -= 1
 
     def async_remove_records(self, entries: Iterable[DNSRecord]) -> None:
         """Remove multiple records.
@@ -145,43 +188,23 @@ def async_expire(self, now: _float) -> list[DNSRecord]:
 
         :param now: The current time in milliseconds.
         """
-        if not (expire_heap_len := len(self._expire_heap)):
+        if not self._expire_heap:
             return []
 
         expired: list[DNSRecord] = []
-        # Find any expired records and add them to the to-delete list
         while self._expire_heap:
             when_record = self._expire_heap[0]
             when = when_record[0]
             if when > now:
                 break
             heappop(self._expire_heap)
-            # Check if the record hasn't been re-added to the heap
-            # with a different expiration time as it will be removed
-            # later when it reaches the top of the heap and its
-            # expiration time is met.
+            # Skip entries left behind by a TTL re-add; the live tuple is
+            # later in the heap and will be removed when it reaches the top.
             record = when_record[1]
             if self._expirations.get(record) == when:
                 expired.append(record)
 
-        # If the expiration heap grows larger than the number expirations
-        # times two, we clean it up to avoid keeping expired entries in
-        # the heap and consuming memory. We guard this with a minimum
-        # threshold to avoid cleaning up the heap too often when there are
-        # only a few scheduled expirations.
-        if (
-            expire_heap_len > _MIN_SCHEDULED_RECORD_EXPIRATION
-            and expire_heap_len > len(self._expirations) * 2
-        ):
-            # Remove any expired entries from the expiration heap
-            # that do not match the expiration time in the expirations
-            # as it means the record has been re-added to the heap
-            # with a different expiration time.
-            self._expire_heap = [
-                entry for entry in self._expire_heap if self._expirations.get(entry[1]) == entry[0]
-            ]
-            heapify(self._expire_heap)
-
+        self._maybe_rebuild_heap()
         self.async_remove_records(expired)
         return expired
 
diff --git a/src/zeroconf/_core.py b/src/zeroconf/_core.py
index 5e3a7f46..f184b6fa 100644
--- a/src/zeroconf/_core.py
+++ b/src/zeroconf/_core.py
@@ -24,6 +24,7 @@
 
 import asyncio
 import logging
+import random
 import sys
 import threading
 from collections.abc import Awaitable
@@ -103,6 +104,13 @@
 
 _REGISTER_BROADCASTS = 3
 
+# RFC 6762 §8.1 thundering-herd avoidance: wait a random
+# 0-250ms before the first probe so simultaneously-started
+# responders don't collide. We default to 150-250ms to
+# preserve existing timing assumptions; tests on loopback
+# may patch this lower via the `quick_timing` fixture.
+_PROBE_RANDOM_DELAY_INTERVAL = (150, 250)  # ms
+
 
 def async_send_with_transport(
     log_debug: bool,
@@ -153,6 +161,7 @@ def __init__(
         unicast: bool = False,
         ip_version: IPVersion | None = None,
         apple_p2p: bool = False,
+        use_asyncio: bool | None = None,
     ) -> None:
         """Creates an instance of the Zeroconf class, establishing
         multicast communications, listening and reaping threads.
@@ -168,6 +177,14 @@ def __init__(
         :param ip_version: IP versions to support. If `choice` is a list, the default is detected
             from it. Otherwise defaults to V4 only for backward compatibility.
         :param apple_p2p: use AWDL interface (only macOS)
+        :param use_asyncio: explicitly control whether to attach to the running
+            asyncio event loop (``True``) or run an internal thread with its
+            own loop (``False``). ``None`` (default) keeps the historic
+            behavior: attach if an event loop is running, otherwise start a
+            thread. Set to ``False`` when running inside an environment that
+            already has an event loop (e.g. Jupyter) but you want blocking
+            semantics. ``True`` raises :class:`RuntimeError` immediately if no
+            running event loop is found, instead of falling back to the thread.
         """
         if ip_version is None:
             ip_version = autodetect_ip_version(interfaces)
@@ -177,7 +194,11 @@ def __init__(
         if apple_p2p and sys.platform != "darwin":
             raise RuntimeError("Option `apple_p2p` is not supported on non-Apple platforms.")
 
+        if use_asyncio is True and get_running_loop() is None:
+            raise RuntimeError("use_asyncio=True requires a running asyncio event loop")
+
         self.unicast = unicast
+        self._use_asyncio = use_asyncio
         listen_socket, respond_sockets = create_sockets(interfaces, unicast, ip_version, apple_p2p=apple_p2p)
         log.debug("Listen socket %s, respond sockets %s", listen_socket, respond_sockets)
 
@@ -215,7 +236,7 @@ def started(self) -> bool:
 
     def start(self) -> None:
         """Start Zeroconf."""
-        self.loop = get_running_loop()
+        self.loop = None if self._use_asyncio is False else get_running_loop()
         if self.loop:
             self.engine.setup(self.loop, None)
             return
@@ -544,6 +565,11 @@ async def async_check_service(
         instance_name = instance_name_from_service_info(info, strict=strict)
         if cooperating_responders:
             return
+
+        # Wait a random amount of time up avoid collisions and avoid
+        # a thundering herd when multiple services are started on the network
+        await self.async_wait(random.randint(*_PROBE_RANDOM_DELAY_INTERVAL))  # noqa: S311
+
         next_instance_number = 2
         next_time = now = current_time_millis()
         i = 0
@@ -670,13 +696,22 @@ def _close(self) -> None:
 
     def _shutdown_threads(self) -> None:
         """Shutdown any threads."""
+        assert self.loop is not None
+        if self.loop.is_closed():
+            # close() is documented as idempotent — a second call after the
+            # loop has been torn down must be a no-op rather than raising.
+            return
         self.notify_all()
         if not self._loop_thread:
             return
-        assert self.loop is not None
         shutdown_loop(self.loop)
         self._loop_thread.join()
         self._loop_thread = None
+        # The loop's selector (epoll FD on Linux) and self-pipe sockets stay
+        # open until loop.close() is called. We own this loop because
+        # _start_thread() created it, so close it here to avoid leaking
+        # those file descriptors across Zeroconf() construct/close cycles.
+        self.loop.close()
 
     def close(self) -> None:
         """Ends the background threads, and prevent this instance from
diff --git a/src/zeroconf/_dns.py b/src/zeroconf/_dns.py
index 60df14b1..93069eb3 100644
--- a/src/zeroconf/_dns.py
+++ b/src/zeroconf/_dns.py
@@ -63,7 +63,7 @@ class DNSQuestionType(enum.Enum):
     QM = 2
 
 
-class DNSEntry:
+class DNSEntry:  # noqa: PLW1641
     """A DNS entry"""
 
     __slots__ = ("class_", "key", "name", "type", "unique")
@@ -161,7 +161,7 @@ def __repr__(self) -> str:
         )
 
 
-class DNSRecord(DNSEntry):
+class DNSRecord(DNSEntry):  # noqa: PLW1641
     """A DNS record - like a DNS entry, but has a TTL"""
 
     __slots__ = ("created", "ttl")
diff --git a/src/zeroconf/_engine.py b/src/zeroconf/_engine.py
index 8a371e1e..0e1c01a1 100644
--- a/src/zeroconf/_engine.py
+++ b/src/zeroconf/_engine.py
@@ -114,10 +114,17 @@ async def _async_create_endpoints(self) -> None:
                 lambda: AsyncListener(self.zc),  # type: ignore[arg-type, return-value]
                 sock=s,
             )
+            # Register the wrapped transport before releasing the engine's
+            # handle so a concurrent shutdown always sees ``s`` in exactly
+            # one place; do not add an ``await`` between these two steps.
             self.protocols.append(cast(AsyncListener, protocol))
             self.readers.append(make_wrapped_transport(cast(asyncio.DatagramTransport, transport)))
             if s in sender_sockets:
                 self.senders.append(make_wrapped_transport(cast(asyncio.DatagramTransport, transport)))
+            if s is self._listen_socket:
+                self._listen_socket = None
+            if s in self._respond_sockets:
+                self._respond_sockets.remove(s)
 
     def _async_cache_cleanup(self) -> None:
         """Periodic cache cleanup."""
@@ -139,19 +146,37 @@ def _async_schedule_next_cache_cleanup(self) -> None:
     async def _async_close(self) -> None:
         """Cancel and wait for the cleanup task to finish."""
         assert self._setup_task is not None
-        await self._setup_task
+        # Swallow CancelledError only if the setup task itself was
+        # cancelled (close-before-start); outer-task cancellation must
+        # propagate.
+        try:
+            await self._setup_task
+        except asyncio.CancelledError:
+            if not self._setup_task.cancelled():
+                raise
         self._async_shutdown()
         await asyncio.sleep(0)  # flush out any call soons
-        assert self._cleanup_timer is not None
-        self._cleanup_timer.cancel()
+        if self._cleanup_timer is not None:
+            self._cleanup_timer.cancel()
 
     def _async_shutdown(self) -> None:
-        """Shutdown transports and sockets."""
+        """Shutdown transports and sockets; safe to call repeatedly."""
         assert self.running_future is not None
         assert self.loop is not None
         self.running_future = self.loop.create_future()
+        # Cancel pending setup so it can't wrap fresh transports after
+        # shutdown has started.
+        if self._setup_task is not None and not self._setup_task.done():
+            self._setup_task.cancel()
         for wrapped_transport in itertools.chain(self.senders, self.readers):
             wrapped_transport.transport.close()
+        # Anything still here was never adopted by a transport.
+        if self._listen_socket is not None:
+            self._listen_socket.close()
+            self._listen_socket = None
+        for s in self._respond_sockets:
+            s.close()
+        self._respond_sockets = []
 
     def close(self) -> None:
         """Close from sync context.
diff --git a/src/zeroconf/_history.pxd b/src/zeroconf/_history.pxd
index d1bb7baf..dab257e4 100644
--- a/src/zeroconf/_history.pxd
+++ b/src/zeroconf/_history.pxd
@@ -4,13 +4,18 @@ from ._dns cimport DNSQuestion
 
 
 cdef cython.double _DUPLICATE_QUESTION_INTERVAL
+cdef unsigned int _MAX_QUESTION_HISTORY_ENTRIES
+cdef unsigned int _MAX_KNOWN_ANSWERS_PER_HISTORY_ENTRY
 
 cdef class QuestionHistory:
 
-    cdef cython.dict _history
+    cdef public cython.dict _history
 
     cpdef void add_question_at_time(self, DNSQuestion question, double now, cython.set known_answers)
 
+    @cython.locals(oldest=DNSQuestion, oldest_entry=cython.tuple, oldest_than=double)
+    cdef void _evict_to_make_room(self, double now)
+
     @cython.locals(than=double, previous_question=cython.tuple, previous_known_answers=cython.set)
     cpdef bint suppresses(self, DNSQuestion question, double now, cython.set known_answers)
 
diff --git a/src/zeroconf/_history.py b/src/zeroconf/_history.py
index 1b6f3fad..10696f4f 100644
--- a/src/zeroconf/_history.py
+++ b/src/zeroconf/_history.py
@@ -23,7 +23,11 @@
 from __future__ import annotations
 
 from ._dns import DNSQuestion, DNSRecord
-from .const import _DUPLICATE_QUESTION_INTERVAL
+from .const import (
+    _DUPLICATE_QUESTION_INTERVAL,
+    _MAX_KNOWN_ANSWERS_PER_HISTORY_ENTRY,
+    _MAX_QUESTION_HISTORY_ENTRIES,
+)
 
 # The QuestionHistory is used to implement Duplicate Question Suppression
 # https://datatracker.ietf.org/doc/html/rfc6762#section-7.3
@@ -40,6 +44,17 @@ def __init__(self) -> None:
 
     def add_question_at_time(self, question: DNSQuestion, now: _float, known_answers: set[DNSRecord]) -> None:
         """Remember a question with known answers."""
+        if len(known_answers) > _MAX_KNOWN_ANSWERS_PER_HISTORY_ENTRY:
+            # Refuse to pin an attacker-sized known-answer payload.
+            # Any pre-existing entry for this question stays in place
+            # so legitimate suppression continues; the cost is missing
+            # one round of suppression for this (likely malicious)
+            # query. Truncating instead would over-suppress because
+            # `suppresses()` matches when the stored set is a subset
+            # of the incoming known-answers (smaller set, easier match).
+            return
+        if question not in self._history and len(self._history) >= _MAX_QUESTION_HISTORY_ENTRIES:
+            self._evict_to_make_room(now)
         self._history[question] = (now, known_answers)
 
     def suppresses(self, question: DNSQuestion, now: _float, known_answers: set[DNSRecord]) -> bool:
@@ -75,3 +90,19 @@ def async_expire(self, now: _float) -> None:
     def clear(self) -> None:
         """Clear the history."""
         self._history.clear()
+
+    def _evict_to_make_room(self, now: _float) -> None:
+        """Drop expired or oldest entries when the history is at cap.
+
+        Peeks at the oldest insertion (dict is ordered) — only runs the
+        full O(n) async_expire sweep if it could actually reclaim
+        something, else a sustained flood at cap turns each insert into
+        a wasted scan. Falls back to oldest-first eviction.
+        """
+        oldest = next(iter(self._history))
+        oldest_entry = self._history[oldest]
+        oldest_than = oldest_entry[0]
+        if now - oldest_than > _DUPLICATE_QUESTION_INTERVAL:
+            self.async_expire(now)
+        while len(self._history) >= _MAX_QUESTION_HISTORY_ENTRIES:
+            del self._history[next(iter(self._history))]
diff --git a/src/zeroconf/_listener.pxd b/src/zeroconf/_listener.pxd
index 4cbc5d00..260ba091 100644
--- a/src/zeroconf/_listener.pxd
+++ b/src/zeroconf/_listener.pxd
@@ -14,6 +14,9 @@ cdef bint TYPE_CHECKING
 
 cdef cython.uint _MAX_MSG_ABSOLUTE
 cdef cython.uint _DUPLICATE_PACKET_SUPPRESSION_INTERVAL
+cdef cython.uint _RECENT_PACKETS_MAX
+cdef cython.uint _MAX_DEFERRED_ADDRS
+cdef cython.uint _MAX_DEFERRED_PER_ADDR
 
 
 cdef class AsyncListener:
@@ -29,16 +32,23 @@ cdef class AsyncListener:
     cdef public object sock_description
     cdef public cython.dict _deferred
     cdef public cython.dict _timers
+    cdef public cython.dict _deferred_deadlines
+    cdef public cython.dict _recent_packets
 
     @cython.locals(now=double, debug=cython.bint)
     cpdef datagram_received(self, cython.bytes bytes, cython.tuple addrs)
 
-    @cython.locals(msg=DNSIncoming)
+    @cython.locals(msg=DNSIncoming, recent_time=double)
     cpdef _process_datagram_at_time(self, bint debug, cython.uint data_len, double now, bytes data, cython.tuple addrs)
 
     cdef _cancel_any_timers_for_addr(self, object addr)
 
-    @cython.locals(incoming=DNSIncoming, deferred=list)
+    cdef _evict_oldest_deferred(self)
+
+    @cython.locals(deadline=object, fire_at=double)
+    cdef double _compute_deferred_fire_at(self, object addr, double now, double delay)
+
+    @cython.locals(incoming=DNSIncoming, deferred=list, now=double, delay=double, fire_at=double)
     cpdef handle_query_or_defer(
         self,
         DNSIncoming msg,
diff --git a/src/zeroconf/_listener.py b/src/zeroconf/_listener.py
index ed503169..7be2a828 100644
--- a/src/zeroconf/_listener.py
+++ b/src/zeroconf/_listener.py
@@ -32,7 +32,13 @@
 from ._protocol.incoming import DNSIncoming
 from ._transport import _WrappedTransport, make_wrapped_transport
 from ._utils.time import current_time_millis, millis_to_seconds
-from .const import _DUPLICATE_PACKET_SUPPRESSION_INTERVAL, _MAX_MSG_ABSOLUTE
+from .const import (
+    _DUPLICATE_PACKET_SUPPRESSION_INTERVAL,
+    _MAX_DEFERRED_ADDRS,
+    _MAX_DEFERRED_PER_ADDR,
+    _MAX_MSG_ABSOLUTE,
+    _RECENT_PACKETS_MAX,
+)
 
 if TYPE_CHECKING:
     from ._core import Zeroconf
@@ -58,7 +64,9 @@ class AsyncListener:
 
     __slots__ = (
         "_deferred",
+        "_deferred_deadlines",
         "_query_handler",
+        "_recent_packets",
         "_record_manager",
         "_registry",
         "_timers",
@@ -82,6 +90,13 @@ def __init__(self, zc: Zeroconf) -> None:
         self.sock_description: str | None = None
         self._deferred: dict[str, list[DNSIncoming]] = {}
         self._timers: dict[str, asyncio.TimerHandle] = {}
+        self._deferred_deadlines: dict[str, float] = {}
+        # Bounded recency window so an alternating (A, B, A, B, ...)
+        # flood cannot defeat single-slot dedup; relies on dict insertion
+        # order so the oldest entry is evicted first. Only payloads
+        # without a QU question are cached so unicast replies still go
+        # out on every receipt.
+        self._recent_packets: dict[bytes, float] = {}
         super().__init__()
 
     def datagram_received(self, data: _bytes, addrs: tuple[str, int] | tuple[str, int, int, int]) -> None:
@@ -128,6 +143,31 @@ def _process_datagram_at_time(
                 )
             return
 
+        # `get(data, -1e30)` keeps the suppression compare a single C
+        # double compare; the sentinel is far below any real `now -
+        # _DUPLICATE_PACKET_SUPPRESSION_INTERVAL` so a cache miss never
+        # triggers the branch even when `now` is small (time.monotonic
+        # is allowed to start near zero, leaving `now - INTERVAL`
+        # negative for the first ~1s after boot). Only non-QU payloads
+        # are cached, so any hit here is safe to suppress without re-
+        # checking has_qu_question.
+        recent_time = self._recent_packets.get(data, -1e30)
+        if (now - _DUPLICATE_PACKET_SUPPRESSION_INTERVAL) < recent_time:
+            # No timestamp refresh on hit so the suppression window
+            # ends at first-observation + interval; one parse-and-
+            # dispatch fires per payload per interval, capping the
+            # CPU cost under a sustained alternating flood.
+            if debug:
+                log.debug(
+                    "Ignoring duplicate message with no unicast questions"
+                    " received from %s [socket %s] (%d bytes) as [%r]",
+                    addrs,
+                    self.sock_description,
+                    data_len,
+                    data,
+                )
+            return
+
         if len(addrs) == 2:
             v6_flow_scope: tuple[()] | tuple[int, int] = ()
             # https://github.com/python/mypy/issues/1178
@@ -148,6 +188,15 @@ def _process_datagram_at_time(
         self.data = data
         self.last_time = now
         self.last_message = msg
+        if not msg.has_qu_question():
+            # Refresh LRU position when an entry exists but the
+            # suppression window has expired; otherwise evict the oldest
+            # entry once the window is full.
+            if data in self._recent_packets:
+                del self._recent_packets[data]
+            elif len(self._recent_packets) >= _RECENT_PACKETS_MAX:
+                del self._recent_packets[next(iter(self._recent_packets))]
+            self._recent_packets[data] = now
         if msg.valid is True:
             if debug:
                 log.debug(
@@ -197,18 +246,35 @@ def handle_query_or_defer(
             self._respond_query(msg, addr, port, transport, v6_flow_scope)
             return
 
+        if addr not in self._deferred and len(self._deferred) >= _MAX_DEFERRED_ADDRS:
+            # Bound total deferred addrs so a spoofed-source flood
+            # cannot keep adding distinct entries; evict the oldest
+            # (insertion-order) entry and discard its in-flight queue.
+            self._evict_oldest_deferred()
+
         deferred = self._deferred.setdefault(addr, [])
+        if len(deferred) >= _MAX_DEFERRED_PER_ADDR:
+            # Bound per-addr queue length; further fragments from the
+            # same source are dropped until the timer flushes.
+            return
         # If we get the same packet we ignore it
         for incoming in reversed(deferred):
             if incoming.data == msg.data:
                 return
         deferred.append(msg)
-        delay = millis_to_seconds(random.randint(*_TC_DELAY_RANDOM_INTERVAL))  # noqa: S311
         loop = self.zc.loop
         assert loop is not None
+        now = loop.time()
+        delay = millis_to_seconds(random.randint(*_TC_DELAY_RANDOM_INTERVAL))  # noqa: S311
+        fire_at = self._compute_deferred_fire_at(addr, now, delay)
+        if fire_at < 0.0:
+            # Sentinel: a new reset would push the flush past the
+            # per-addr reassembly deadline, so leave the existing
+            # TimerHandle in place rather than re-arming it.
+            return
         self._cancel_any_timers_for_addr(addr)
         self._timers[addr] = loop.call_at(
-            loop.time() + delay,
+            fire_at,
             self._respond_query,
             None,
             addr,
@@ -217,11 +283,47 @@ def handle_query_or_defer(
             v6_flow_scope,
         )
 
+    def _compute_deferred_fire_at(self, addr: _str, now: _float, delay: _float) -> _float:
+        """Return the bounded call_at time for a TC-deferred flush, or -1.0 to keep the existing timer."""
+        # RFC 6762 §18.5 frames the random delay as a fixed reassembly budget
+        # starting at first arrival, not a sliding heartbeat.
+        deadline = self._deferred_deadlines.get(addr)
+        if deadline is None:
+            deadline = now + millis_to_seconds(_TC_DELAY_RANDOM_INTERVAL[1])
+            self._deferred_deadlines[addr] = deadline
+        fire_at = now + delay
+        if fire_at >= deadline:
+            if addr in self._timers:
+                # Existing timer already fires at or before the deadline;
+                # signal the caller to leave it alone rather than reset it.
+                return -1.0
+            # First packet for this addr already proposes a fire-time at
+            # or past the deadline — clamp to the deadline so the flush
+            # still happens within the reassembly budget.
+            return deadline
+        # Within budget: schedule at the proposed fire-time.
+        return fire_at
+
     def _cancel_any_timers_for_addr(self, addr: _str) -> None:
         """Cancel any future truncated packet timers for the address."""
         if addr in self._timers:
             self._timers.pop(addr).cancel()
 
+    def _evict_oldest_deferred(self) -> None:
+        """Discard the oldest deferred addr's reassembly state.
+
+        Used when ``_MAX_DEFERRED_ADDRS`` would be exceeded; the
+        evicted addr's queue and timer are dropped without firing, so
+        the bound holds even when an attacker rotates source IPs.
+        Eviction is FIFO (oldest by first-seen, via dict insertion
+        order) rather than LRU so an active flooder cannot pin its
+        slots by re-sending into the same addr.
+        """
+        oldest_addr = next(iter(self._deferred))
+        self._cancel_any_timers_for_addr(oldest_addr)
+        self._deferred_deadlines.pop(oldest_addr, None)
+        del self._deferred[oldest_addr]
+
     def _respond_query(
         self,
         msg: DNSIncoming | None,
@@ -232,6 +334,7 @@ def _respond_query(
     ) -> None:
         """Respond to a query and reassemble any truncated deferred packets."""
         self._cancel_any_timers_for_addr(addr)
+        self._deferred_deadlines.pop(addr, None)
         packets = self._deferred.pop(addr, [])
         if msg:
             packets.append(msg)
diff --git a/src/zeroconf/_logger.py b/src/zeroconf/_logger.py
index 0d734dfd..99990cf6 100644
--- a/src/zeroconf/_logger.py
+++ b/src/zeroconf/_logger.py
@@ -25,7 +25,7 @@
 
 import logging
 import sys
-from typing import Any, ClassVar, cast
+from typing import Any
 
 log = logging.getLogger(__name__.split(".", maxsplit=1)[0])
 log.addHandler(logging.NullHandler())
@@ -39,50 +39,73 @@ def set_logger_level_if_unset() -> None:
 set_logger_level_if_unset()
 
 
-class QuietLogger:
-    _seen_logs: ClassVar[dict[str, int | tuple]] = {}
+_MAX_SEEN_LOGS = 512
+_seen_logs: dict[str, None] = {}
+
+
+def _evict_oldest(seen: dict[str, None]) -> bool:
+    """Pop the oldest entry from ``seen``; return False if it raced.
+
+    Individual dict ops (``pop`` with a default, ``next``) are atomic
+    on the free-threaded build, but the compound ``iter`` → ``next``
+    used to pick the FIFO victim can raise ``RuntimeError`` if
+    another thread mutates the dict between the two ops. The caller
+    breaks its drain loop on False so concurrent mutation can't make
+    it spin.
+    """
+    try:
+        seen.pop(next(iter(seen)), None)
+    except (RuntimeError, StopIteration):
+        return False
+    return True
+
+
+def _mark_seen(seen: dict[str, None], key: str) -> bool:
+    """Record ``key`` in ``seen`` and return True if it was newly added.
+
+    Bounds the dict so callers passing attacker-influenced keys (peer
+    addresses, packet offsets) cannot grow it without bound. Evicts
+    the oldest entries on overflow (dict preserves insertion order on
+    Python 3.7+), so ``_MAX_SEEN_LOGS`` is a recency window.
+
+    The dict is shared across all ``Zeroconf`` instances in the
+    process; on the free-threaded build (3.14t) and under multi-
+    instance sync use, callers can race the ``len < cap`` check and
+    both insert, leaving the dict transiently above the cap. The
+    drain loop runs on every call (steady-state-at-cap hits are a
+    single ``len`` + compare past the membership check because the
+    helper short-circuits) so a contention burst is corrected by the
+    next caller regardless of whether it's a hit or a miss.
+    """
+    inserting = key not in seen
+    # Hit (``inserting`` is False): drain only if drifted above cap.
+    # Miss (``inserting`` is True): drain to ``cap - 1`` to make room
+    # for the new key. Bool subtracts as 0/1 to pick the right limit.
+    while len(seen) > _MAX_SEEN_LOGS - inserting and _evict_oldest(seen):
+        pass
+    if inserting:
+        seen[key] = None
+    return inserting
+
 
+class QuietLogger:
     @classmethod
     def log_exception_warning(cls, *logger_data: Any) -> None:
-        exc_info = sys.exc_info()
-        exc_str = str(exc_info[1])
-        if exc_str not in cls._seen_logs:
-            # log at warning level the first time this is seen
-            cls._seen_logs[exc_str] = exc_info
-            logger = log.warning
-        else:
-            logger = log.debug
+        first_time = _mark_seen(_seen_logs, str(sys.exc_info()[1]))
+        logger = log.warning if first_time else log.debug
         logger(*(logger_data or ["Exception occurred"]), exc_info=True)
 
     @classmethod
     def log_exception_debug(cls, *logger_data: Any) -> None:
-        log_exc_info = False
-        exc_info = sys.exc_info()
-        exc_str = str(exc_info[1])
-        if exc_str not in cls._seen_logs:
-            # log the trace only on the first time
-            cls._seen_logs[exc_str] = exc_info
-            log_exc_info = True
-        log.debug(*(logger_data or ["Exception occurred"]), exc_info=log_exc_info)
+        first_time = _mark_seen(_seen_logs, str(sys.exc_info()[1]))
+        log.debug(*(logger_data or ["Exception occurred"]), exc_info=first_time)
 
     @classmethod
     def log_warning_once(cls, *args: Any) -> None:
-        msg_str = args[0]
-        if msg_str not in cls._seen_logs:
-            cls._seen_logs[msg_str] = 0
-            logger = log.warning
-        else:
-            logger = log.debug
-        cls._seen_logs[msg_str] = cast(int, cls._seen_logs[msg_str]) + 1
+        logger = log.warning if _mark_seen(_seen_logs, args[0]) else log.debug
         logger(*args)
 
     @classmethod
     def log_exception_once(cls, exc: Exception, *args: Any) -> None:
-        msg_str = args[0]
-        if msg_str not in cls._seen_logs:
-            cls._seen_logs[msg_str] = 0
-            logger = log.warning
-        else:
-            logger = log.debug
-        cls._seen_logs[msg_str] = cast(int, cls._seen_logs[msg_str]) + 1
+        logger = log.warning if _mark_seen(_seen_logs, args[0]) else log.debug
         logger(*args, exc_info=exc)
diff --git a/src/zeroconf/_protocol/incoming.pxd b/src/zeroconf/_protocol/incoming.pxd
index feaa2a02..ac8c6e21 100644
--- a/src/zeroconf/_protocol/incoming.pxd
+++ b/src/zeroconf/_protocol/incoming.pxd
@@ -83,7 +83,7 @@ cdef class DNSIncoming:
         link_py_int=object,
         linked_labels=cython.list
     )
-    cdef unsigned int _decode_labels_at_offset(self, unsigned int off, cython.list labels, cython.set seen_pointers)
+    cdef unsigned int _decode_labels_at_offset(self, unsigned int off, cython.list labels, cython.set seen_pointers, unsigned int depth)
 
     @cython.locals(offset="unsigned int")
     cdef void _read_header(self)
@@ -128,6 +128,7 @@ cdef class DNSIncoming:
         byte="unsigned int",
         i="unsigned int",
         bitmap_length="unsigned int",
+        bitmap_end="unsigned int",
     )
     cdef list _read_bitmap(self, unsigned int end)
 
diff --git a/src/zeroconf/_protocol/incoming.py b/src/zeroconf/_protocol/incoming.py
index 2d977b64..9ef2631a 100644
--- a/src/zeroconf/_protocol/incoming.py
+++ b/src/zeroconf/_protocol/incoming.py
@@ -37,7 +37,7 @@
     DNSText,
 )
 from .._exceptions import IncomingDecodeError
-from .._logger import log
+from .._logger import _mark_seen, log
 from .._utils.time import current_time_millis
 from ..const import (
     _FLAGS_QR_MASK,
@@ -60,10 +60,10 @@
 MAX_DNS_LABELS = 128
 MAX_NAME_LENGTH = 253
 
-DECODE_EXCEPTIONS = (IndexError, struct.error, IncomingDecodeError)
+DECODE_EXCEPTIONS = (IndexError, struct.error, IncomingDecodeError, RecursionError)
 
 
-_seen_logs: dict[str, int | tuple] = {}
+_seen_logs: dict[str, None] = {}
 _str = str
 _int = int
 
@@ -182,13 +182,7 @@ def _initial_parse(self) -> None:
 
     @classmethod
     def _log_exception_debug(cls, *logger_data: Any) -> None:
-        log_exc_info = False
-        exc_info = sys.exc_info()
-        exc_str = str(exc_info[1])
-        if exc_str not in _seen_logs:
-            # log the trace only on the first time
-            _seen_logs[exc_str] = exc_info
-            log_exc_info = True
+        log_exc_info = _mark_seen(_seen_logs, str(sys.exc_info()[1]))
         log.debug(*(logger_data or ["Exception occurred"]), exc_info=log_exc_info)
 
     def answers(self) -> list[DNSRecord]:
@@ -260,12 +254,27 @@ def _read_character_string(self) -> str:
         """Reads a character string from the packet"""
         length = self.view[self.offset]
         self.offset += 1
+        # Python slicing silently truncates when indices exceed the buffer,
+        # but self.offset still advances by the declared length below; without
+        # this check a record with an inflated character-string length would
+        # land in the cache carrying a payload shorter than the wire claimed
+        # and leave the parser pointed past _data_len for the next record.
+        if self.offset + length > self._data_len:
+            raise IncomingDecodeError(
+                f"Character string length {length} at offset {self.offset} overruns "
+                f"packet of {self._data_len} bytes from {self.source}"
+            )
         info = self.data[self.offset : self.offset + length].decode("utf-8", "replace")
         self.offset += length
         return info
 
     def _read_string(self, length: _int) -> bytes:
         """Reads a string of a given length from the packet"""
+        if self.offset + length > self._data_len:
+            raise IncomingDecodeError(
+                f"String length {length} at offset {self.offset} overruns "
+                f"packet of {self._data_len} bytes from {self.source}"
+            )
         info = self.data[self.offset : self.offset + length]
         self.offset += length
         return info
@@ -303,6 +312,19 @@ def _read_others(self) -> None:
                     self.data,
                     exc_info=True,
                 )
+            if rec is not None and self.offset != end:
+                # The decoded record consumed a different number of bytes than
+                # rdlength advertised. The record is built from a slice that
+                # straddles its rdata boundary, so drop it and resync to the
+                # declared end so the next record header lands aligned.
+                log.debug(
+                    "Record for %s with type %s did not consume exactly rdlength=%d; dropping",
+                    domain,
+                    _TYPES.get(type_, type_),
+                    length,
+                )
+                self.offset = end
+                rec = None
             if rec is not None:
                 self._answers.append(rec)
 
@@ -394,9 +416,23 @@ def _read_bitmap(self, end: _int) -> list[int]:
             offset = self.offset
             offset_plus_one = offset + 1
             offset_plus_two = offset + 2
+            # RFC 4034 §4.1.2: each window block is window-number byte +
+            # bitmap-length byte (1..32) + bitmap. A bitmap_length that walks
+            # past the record's declared end would otherwise leave self.offset
+            # pointing inside (or past) the next record header, corrupting
+            # every subsequent record in the same packet.
+            if offset_plus_two > end:
+                raise IncomingDecodeError(
+                    f"NSEC bitmap window header truncated at offset {offset} from {self.source}"
+                )
             window = view[offset]
             bitmap_length = view[offset_plus_one]
             bitmap_end = offset_plus_two + bitmap_length
+            if bitmap_length == 0 or bitmap_length > 32 or bitmap_end > end:
+                raise IncomingDecodeError(
+                    f"NSEC bitmap length {bitmap_length} invalid or overruns record end "
+                    f"at offset {offset} from {self.source}"
+                )
             for i, byte in enumerate(self.data[offset_plus_two:bitmap_end]):
                 for bit in range(8):
                     if byte & (0x80 >> bit):
@@ -409,7 +445,7 @@ def _read_name(self) -> str:
         labels: list[str] = []
         seen_pointers: set[int] = set()
         original_offset = self.offset
-        self.offset = self._decode_labels_at_offset(original_offset, labels, seen_pointers)
+        self.offset = self._decode_labels_at_offset(original_offset, labels, seen_pointers, 0)
         self._name_cache[original_offset] = labels
         name = ".".join(labels) + "."
         if len(name) > MAX_NAME_LENGTH:
@@ -418,8 +454,14 @@ def _read_name(self) -> str:
             )
         return name
 
-    def _decode_labels_at_offset(self, off: _int, labels: list[str], seen_pointers: set[int]) -> int:
+    def _decode_labels_at_offset(
+        self, off: _int, labels: list[str], seen_pointers: set[int], depth: _int
+    ) -> int:
         # This is a tight loop that is called frequently, small optimizations can make a difference.
+        if depth > MAX_DNS_LABELS:
+            raise IncomingDecodeError(
+                f"DNS compression pointer chain exceeds {MAX_DNS_LABELS} at {off} from {self.source}"
+            )
         view = self.view
         while off < self._data_len:
             length = view[off]
@@ -457,7 +499,7 @@ def _decode_labels_at_offset(self, off: _int, labels: list[str], seen_pointers:
             if not linked_labels:
                 linked_labels = []
                 seen_pointers.add(link_py_int)
-                self._decode_labels_at_offset(link, linked_labels, seen_pointers)
+                self._decode_labels_at_offset(link, linked_labels, seen_pointers, depth + 1)
                 self._name_cache[link_py_int] = linked_labels
             labels.extend(linked_labels)
             if len(labels) > MAX_DNS_LABELS:
diff --git a/src/zeroconf/_services/__init__.py b/src/zeroconf/_services/__init__.py
index b244552f..cc794dc6 100644
--- a/src/zeroconf/_services/__init__.py
+++ b/src/zeroconf/_services/__init__.py
@@ -23,7 +23,8 @@
 from __future__ import annotations
 
 import enum
-from typing import TYPE_CHECKING, Any, Callable
+from collections.abc import Callable
+from typing import TYPE_CHECKING, Any
 
 if TYPE_CHECKING:
     from .._core import Zeroconf
diff --git a/src/zeroconf/_services/browser.pxd b/src/zeroconf/_services/browser.pxd
index 1ea99c82..ef9dcafc 100644
--- a/src/zeroconf/_services/browser.pxd
+++ b/src/zeroconf/_services/browser.pxd
@@ -14,6 +14,7 @@ cdef bint TYPE_CHECKING
 cdef object cached_possible_types
 cdef cython.uint _EXPIRE_REFRESH_TIME_PERCENT, _MAX_MSG_TYPICAL, _DNS_PACKET_HEADER_LEN
 cdef cython.uint _TYPE_PTR
+cdef cython.uint _TYPE_NSEC
 cdef object _CLASS_IN
 cdef object SERVICE_STATE_CHANGE_ADDED, SERVICE_STATE_CHANGE_REMOVED, SERVICE_STATE_CHANGE_UPDATED
 cdef cython.set _ADDRESS_RECORD_TYPES
diff --git a/src/zeroconf/_services/browser.py b/src/zeroconf/_services/browser.py
index 1f60e8f9..ed70793f 100644
--- a/src/zeroconf/_services/browser.py
+++ b/src/zeroconf/_services/browser.py
@@ -23,19 +23,19 @@
 from __future__ import annotations
 
 import asyncio
+import contextlib
 import heapq
 import queue
 import random
 import threading
 import time
 import warnings
-from collections.abc import Iterable
+from collections.abc import Callable, Iterable
 from functools import partial
 from types import TracebackType  # used in type hints
 from typing import (
     TYPE_CHECKING,
     Any,
-    Callable,
     cast,
 )
 
@@ -63,6 +63,7 @@
     _MDNS_ADDR,
     _MDNS_ADDR6,
     _MDNS_PORT,
+    _TYPE_NSEC,
     _TYPE_PTR,
 )
 
@@ -99,7 +100,7 @@
 heappush = heapq.heappush
 
 
-class _ScheduledPTRQuery:
+class _ScheduledPTRQuery:  # noqa: PLW1641
     __slots__ = (
         "alias",
         "cancelled",
@@ -678,7 +679,12 @@ def async_update_records(self, zc: Zeroconf, now: float_, records: list[RecordUp
             old_record = record_update.old
             record_type = record.type
 
-            if record_type is _TYPE_PTR:
+            # NSEC records assert non-existence of a record type
+            # (RFC 6762 §6.1); skip so we do not fire spurious updates.
+            if record_type == _TYPE_NSEC:
+                continue
+
+            if record_type == _TYPE_PTR:
                 if TYPE_CHECKING:
                     record = cast(DNSPointer, record)
                 pointer = record
@@ -793,7 +799,16 @@ def cancel(self) -> None:
         """Cancel the browser."""
         assert self.zc.loop is not None
         self.queue.put(None)
-        self.zc.loop.call_soon_threadsafe(self._async_cancel)
+        # While the loop is running, _async_cancel stops the query scheduler
+        # and cancels the query-sender task — that is the normal cleanup
+        # path. Skip scheduling solely because the loop is closed: a closed
+        # loop rejects call_soon_threadsafe with RuntimeError. The
+        # is_closed() check narrows the common case (loop already closed by
+        # Zeroconf.close()) without paying for raise/catch; suppress covers
+        # the residual is_closed() -> call_soon_threadsafe race window.
+        with contextlib.suppress(RuntimeError):
+            if not self.zc.loop.is_closed():
+                self.zc.loop.call_soon_threadsafe(self._async_cancel)
         self.join()
 
     def run(self) -> None:
diff --git a/src/zeroconf/_services/info.pxd b/src/zeroconf/_services/info.pxd
index 3f65bc0a..7fc85f9a 100644
--- a/src/zeroconf/_services/info.pxd
+++ b/src/zeroconf/_services/info.pxd
@@ -107,6 +107,9 @@ cdef class ServiceInfo(RecordUpdateListener):
     )
     cdef bint _process_record_threadsafe(self, object zc, DNSRecord record, double now)
 
+    @cython.locals(existing_idx=int, existing=object)
+    cdef bint _upsert_ipv6_address(self, object ip_addr)
+
     @cython.locals(cache=DNSCache)
     cdef cython.list _get_address_records_from_cache_by_type(self, object zc, object _type)
 
diff --git a/src/zeroconf/_services/info.py b/src/zeroconf/_services/info.py
index 9b38de9d..d080761d 100644
--- a/src/zeroconf/_services/info.py
+++ b/src/zeroconf/_services/info.py
@@ -24,6 +24,7 @@
 
 import asyncio
 import random
+from collections.abc import Sequence
 from typing import TYPE_CHECKING, cast
 
 from .._cache import DNSCache
@@ -108,6 +109,36 @@
     from .._core import Zeroconf
 
 
+def _index_of_same_address(
+    addresses: Sequence[ZeroconfIPv4Address | ZeroconfIPv6Address],
+    ip_addr: ZeroconfIPv4Address | ZeroconfIPv6Address,
+) -> int:
+    """Return the index of an existing entry with the same packed bytes, or -1.
+
+    Match by ``zc_integer`` so IPv6 addresses that differ only in
+    scope_id (one observed without scope on an IPv4 socket, another
+    observed with scope on an IPv6 socket) collapse to a single entry.
+    """
+    target = ip_addr.zc_integer
+    for idx, existing in enumerate(addresses):
+        if existing.zc_integer == target:
+            return idx
+    return -1
+
+
+def _has_more_scope_info(
+    new_addr: ZeroconfIPv4Address | ZeroconfIPv6Address,
+    existing: ZeroconfIPv4Address | ZeroconfIPv6Address,
+) -> bool:
+    """True if ``new_addr`` carries a scope_id the ``existing`` entry lacks."""
+    if new_addr.version != 6:
+        return False
+    if TYPE_CHECKING:
+        assert isinstance(new_addr, ZeroconfIPv6Address)
+        assert isinstance(existing, ZeroconfIPv6Address)
+    return new_addr.scope_id is not None and existing.scope_id is None
+
+
 def instance_name_from_service_info(info: ServiceInfo, strict: bool = True) -> str:
     """Calculate the instance name from the ServiceInfo."""
     # This is kind of funky because of the subtype based tests
@@ -453,11 +484,49 @@ def _get_ip_addresses_from_cache_lifo(
             if record.is_expired(now):
                 continue
             ip_addr = get_ip_address_object_from_record(record)
-            if ip_addr is not None and ip_addr not in address_list:
+            if ip_addr is None:
+                continue
+            # The cache keeps scoped and unscoped link-local AAAA
+            # records as separate entries because DNSAddress equality
+            # includes scope_id. Collapse them here so each address
+            # appears once; the scoped variant wins so callers of
+            # parsed_scoped_addresses() get a %<interface_index>-
+            # qualified link-local address when one was observed.
+            existing_idx = _index_of_same_address(address_list, ip_addr)
+            if existing_idx == -1:
                 address_list.append(ip_addr)
+                continue
+            # Move the re-seen address to the end so the later observation
+            # wins both in value (scope) and in LIFO position after reverse.
+            existing = address_list.pop(existing_idx)
+            address_list.append(ip_addr if _has_more_scope_info(ip_addr, existing) else existing)
         address_list.reverse()  # Reverse to get LIFO order
         return address_list
 
+    def _upsert_ipv6_address(self, ip_addr: ZeroconfIPv6Address) -> bool:
+        """Insert or update an IPv6 address in LIFO order.
+
+        Compares by integer (not IPv6Address equality, which respects
+        scope_id) so the same link-local address received first without
+        scope (IPv4 socket) and then with scope (IPv6 socket) collapses
+        to one entry. The scoped variant wins so parsed_scoped_addresses()
+        can return a qualified address.
+        """
+        ipv6_addresses = self._ipv6_addresses
+        existing_idx = _index_of_same_address(ipv6_addresses, ip_addr)
+        if existing_idx == -1:
+            ipv6_addresses.insert(0, ip_addr)
+            return True
+        existing = ipv6_addresses[existing_idx]
+        if _has_more_scope_info(ip_addr, existing):
+            ipv6_addresses.pop(existing_idx)
+            ipv6_addresses.insert(0, ip_addr)
+            return True
+        if existing_idx != 0:
+            ipv6_addresses.pop(existing_idx)
+            ipv6_addresses.insert(0, existing)
+        return False
+
     def _set_ipv6_addresses_from_cache(self, zc: Zeroconf, now: float_) -> None:
         """Set IPv6 addresses from the cache."""
         if TYPE_CHECKING:
@@ -532,19 +601,7 @@ def _process_record_threadsafe(self, zc: Zeroconf, record: DNSRecord, now: float
 
             if TYPE_CHECKING:
                 assert isinstance(ip_addr, ZeroconfIPv6Address)
-            ipv6_addresses = self._ipv6_addresses
-            if ip_addr not in self._ipv6_addresses:
-                ipv6_addresses.insert(0, ip_addr)
-                return True
-            # Use int() to compare the addresses as integers
-            # since by default IPv6Address.__eq__ compares the
-            # the addresses on version and int which more than
-            # we need here since we know the version is 6.
-            if ip_addr.zc_integer != self._ipv6_addresses[0].zc_integer:
-                ipv6_addresses.remove(ip_addr)
-                ipv6_addresses.insert(0, ip_addr)
-
-            return False
+            return self._upsert_ipv6_address(ip_addr)
 
         if record_key != self.key:
             return False
diff --git a/src/zeroconf/_utils/name.py b/src/zeroconf/_utils/name.py
index de35f7af..165ce99d 100644
--- a/src/zeroconf/_utils/name.py
+++ b/src/zeroconf/_utils/name.py
@@ -83,7 +83,9 @@ def service_type_name(type_: str, *, strict: bool = True) -> str:  # pylint: dis
         # https://datatracker.ietf.org/doc/html/rfc6763#section-7.2
         raise BadTypeInNameException(f"Full name ({type_}) must be > 256 bytes")
 
-    if type_.endswith((_TCP_PROTOCOL_LOCAL_TRAILER, _NONTCP_PROTOCOL_LOCAL_TRAILER)):
+    # RFC 1035 §2.3.3 / RFC 6762 §16 — DNS name comparisons are case-insensitive.
+    type_lower = type_.lower()
+    if type_lower.endswith((_TCP_PROTOCOL_LOCAL_TRAILER, _NONTCP_PROTOCOL_LOCAL_TRAILER)):
         remaining = type_[: -len(_TCP_PROTOCOL_LOCAL_TRAILER)].split(".")
         trailer = type_[-len(_TCP_PROTOCOL_LOCAL_TRAILER) :]
         has_protocol = True
@@ -92,7 +94,7 @@ def service_type_name(type_: str, *, strict: bool = True) -> str:  # pylint: dis
             f"Type '{type_}' must end with "
             f"'{_TCP_PROTOCOL_LOCAL_TRAILER}' or '{_NONTCP_PROTOCOL_LOCAL_TRAILER}'"
         )
-    elif type_.endswith(_LOCAL_TRAILER):
+    elif type_lower.endswith(_LOCAL_TRAILER):
         remaining = type_[: -len(_LOCAL_TRAILER)].split(".")
         trailer = type_[-len(_LOCAL_TRAILER) + 1 :]
         has_protocol = False
diff --git a/src/zeroconf/_utils/net.py b/src/zeroconf/_utils/net.py
index e67edf78..01c5b040 100644
--- a/src/zeroconf/_utils/net.py
+++ b/src/zeroconf/_utils/net.py
@@ -30,7 +30,7 @@
 import sys
 import warnings
 from collections.abc import Iterable, Sequence
-from typing import Any, Union, cast
+from typing import Any, cast
 
 import ifaddr
 
@@ -44,7 +44,7 @@ class InterfaceChoice(enum.Enum):
     All = 2
 
 
-InterfacesType = Union[Sequence[Union[str, int, tuple[tuple[str, int, int], int]]], InterfaceChoice]
+InterfacesType = Sequence[str | int | tuple[tuple[str, int, int], int]] | InterfaceChoice
 
 
 @enum.unique
diff --git a/src/zeroconf/asyncio.py b/src/zeroconf/asyncio.py
index a0f4a99d..45aac67a 100644
--- a/src/zeroconf/asyncio.py
+++ b/src/zeroconf/asyncio.py
@@ -24,9 +24,8 @@
 
 import asyncio
 import contextlib
-from collections.abc import Awaitable
+from collections.abc import Awaitable, Callable
 from types import TracebackType  # used in type hints
-from typing import Callable
 
 from ._core import Zeroconf
 from ._dns import DNSQuestionType
diff --git a/src/zeroconf/const.py b/src/zeroconf/const.py
index c3a62875..f1b43be5 100644
--- a/src/zeroconf/const.py
+++ b/src/zeroconf/const.py
@@ -28,11 +28,17 @@
 # Some timing constants
 
 _UNREGISTER_TIME = 125  # ms
-_CHECK_TIME = 175  # ms
+_CHECK_TIME = 500  # ms
 _REGISTER_TIME = 225  # ms
 _LISTENER_TIME = 200  # ms
 _BROWSER_TIME = 10000  # ms
 _DUPLICATE_PACKET_SUPPRESSION_INTERVAL = 1000  # ms
+# Per-listener bounded recency window. 16 is large enough to defeat
+# the alternating-payload bypass (RFC 6762 §6.2, issue #1724 — even a
+# rotation of a dozen distinct payloads still dedups), and small
+# enough that the dict bookkeeping per miss stays cheap under a
+# hostile flood.
+_RECENT_PACKETS_MAX = 16
 _DUPLICATE_QUESTION_INTERVAL = 999  # ms # Must be 1ms less than _DUPLICATE_PACKET_SUPPRESSION_INTERVAL
 _CACHE_CLEANUP_INTERVAL = 10  # s
 _LOADED_SYSTEM_TIMEOUT = 10  # s
@@ -59,6 +65,47 @@
 # level of rate limit and safe guards so we use 1/4 of the recommended value
 _DNS_PTR_MIN_TTL = 1125
 
+# Upper bound on the number of records the DNSCache will hold before it
+# starts evicting the closest-to-expiration entry to make room for new
+# arrivals. Bounds the memory a malicious LAN peer can force the cache
+# to retain by multicasting many unique-name records.
+_MAX_CACHE_RECORDS = 10000
+
+# Upper bound on the number of entries QuestionHistory will hold between
+# the periodic 10s cache-cleanup ticks. Bounds the memory a malicious LAN
+# peer can force the duplicate-question-suppression history to retain by
+# flooding distinct questions (RFC 6762 §7.3, defense-in-depth).
+_MAX_QUESTION_HISTORY_ENTRIES = 10000
+
+# Per-entry cap on the number of known-answer records QuestionHistory
+# will retain. Each TC-deferred reassembly can carry up to ~12k records
+# (~750 records/packet x _MAX_DEFERRED_PER_ADDR fragments), and the
+# resulting set is stored by reference under each non-unicast question
+# in the history dict; without a per-entry cap a LAN attacker can pin
+# hundreds of MB across the _MAX_QUESTION_HISTORY_ENTRIES dimension.
+# 256 is well above any RFC-realistic known-answer list for a single
+# question; oversized payloads are dropped from the history (no
+# suppression for that one query) rather than truncated, since a
+# truncated stored set would over-suppress legitimate follow-up
+# queries (`suppresses()` returns True when stored set is a subset of
+# the incoming known-answers, so a smaller stored set matches more
+# easily).
+_MAX_KNOWN_ANSWERS_PER_HISTORY_ENTRY = 256
+
+# Per-addr cap on the number of truncated (TC-bit) packets retained for
+# RFC 6762 §18.5 reassembly. The spec anticipates only a handful of
+# segments per truncated query; 16 is well above legitimate need and
+# keeps the per-arrival dedup scan a constant-time cost under a flood.
+_MAX_DEFERRED_PER_ADDR = 16
+
+# Per-listener cap on the number of distinct addrs with in-flight
+# TC-deferral state. Each entry can hold up to _MAX_DEFERRED_PER_ADDR
+# packets of up to _MAX_MSG_ABSOLUTE bytes; 512 leaves headroom for a
+# legitimate burst (LAN-wide power-resume / boot storm where many
+# devices announce at once) while bounding worst-case memory at
+# ~72 MB even when a peer floods with spoofed source IPs.
+_MAX_DEFERRED_ADDRS = 512
+
 _DNS_PACKET_HEADER_LEN = 12
 
 _MAX_MSG_TYPICAL = 1460  # unused
diff --git a/tests/__init__.py b/tests/__init__.py
index a70cca60..d68444d0 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -23,24 +23,62 @@
 from __future__ import annotations
 
 import asyncio
+import platform
 import socket
 import time
+from collections.abc import Iterable
 from functools import cache
 from unittest import mock
 
 import ifaddr
 
-from zeroconf import DNSIncoming, DNSQuestion, DNSRecord, Zeroconf
+from zeroconf import DNSIncoming, DNSOutgoing, DNSQuestion, DNSRecord, Zeroconf, const
 from zeroconf._history import QuestionHistory
 
 _MONOTONIC_RESOLUTION = time.get_clock_info("monotonic").resolution
 
+_IS_PYPY = platform.python_implementation() == "PyPy"
+
+# get_service_info / async_request timeout for tests using the
+# `quick_request_timing` fixture. The fixture cuts the initial-query
+# delay to ~15ms (10ms _LISTENER_TIME + 1-5ms jitter), so 50ms is
+# ample headroom for tests that only need to observe the first one
+# or two queries.
+QUICK_REQUEST_TIMEOUT_MS = 50
+
+# Timeout for ZeroconfServiceTypes.find() / AsyncZeroconfServiceTypes.async_find()
+# in loopback integration tests. `find()` is just `time.sleep(timeout)` —
+# it doesn't short-circuit on the first matching response — so the
+# timeout becomes a lower bound on the test runtime. Callers MUST use
+# the `quick_timing` fixture, which shrinks the browser's first-query
+# delay from RFC 6762 §5.2's 20-120ms window to 1-5ms; with that shave
+# the registrar's response lands inside ~10ms and 75ms is ~7x headroom.
+# PyPy's JIT is still warming up the first time this path runs early in
+# the suite, so the round trip is too slow for 75ms; give it more room.
+LOOPBACK_FIND_TIMEOUT = 0.3 if _IS_PYPY else 0.075
+
+# IPv6-only `find()` on Linux GitHub runners can hit `[Errno 101] Network
+# is unreachable` on the `::1` socket and falls back to the `fe80::` link-
+# local interface, which adds latency the IPv4 loopback path never pays.
+# PyPy widens that further with JIT warmup. The 75ms budget that works on
+# IPv4 loopback is too tight for the V6Only path under those conditions
+# — give it more headroom.
+IPV6_LOOPBACK_FIND_TIMEOUT = 0.5
+
 
 class QuestionHistoryWithoutSuppression(QuestionHistory):
     def suppresses(self, question: DNSQuestion, now: float, known_answers: set[DNSRecord]) -> bool:
         return False
 
 
+def mock_incoming_msg(records: Iterable[DNSRecord]) -> DNSIncoming:
+    """Build a `DNSIncoming` response message from a list of `DNSRecord`s."""
+    generated = DNSOutgoing(const._FLAGS_QR_RESPONSE)
+    for record in records:
+        generated.add_answer_at_time(record, 0)
+    return DNSIncoming(generated.packets()[0])
+
+
 def _inject_responses(zc: Zeroconf, msgs: list[DNSIncoming]) -> None:
     """Inject a DNSIncoming response."""
     assert zc.loop is not None
@@ -89,16 +127,38 @@ def has_working_ipv6():
 def _clear_cache(zc: Zeroconf) -> None:
     zc.cache.cache.clear()
     zc.question_history.clear()
+    # Reset per-listener dedup state so identical packets sent in the
+    # next phase of the test are not suppressed by the bounded recency
+    # window populated during the previous phase.
+    if zc.engine is not None:
+        for protocol in zc.engine.protocols:
+            protocol._recent_packets.clear()
+            protocol.data = None
+            protocol.last_time = 0
+
+
+def _backdate_cache(zc: Zeroconf, ms: int = 1100) -> None:
+    """Backdate every cached record's `created` time by `ms` milliseconds.
+
+    rfc6762#section-10.2 keys off "received more than one second ago", so
+    backdating is equivalent to sleeping `ms` in real time without the
+    wall-clock wait.
+
+    Iterate `store.values()`, not the dict directly — when a record is
+    re-added with an equal hash, the key stays the original object while
+    the value is replaced with the latest; mutating the key would update
+    stale objects no one reads.
+    """
+    for store in zc.cache.cache.values():
+        for record in store.values():
+            record.created -= ms
 
 
 def time_changed_millis(millis: float | None = None) -> None:
     """Call all scheduled events for a time."""
     loop = asyncio.get_running_loop()
     loop_time = loop.time()
-    if millis is not None:
-        mock_seconds_into_future = millis / 1000
-    else:
-        mock_seconds_into_future = loop_time
+    mock_seconds_into_future = millis / 1000 if millis is not None else loop_time
 
     with mock.patch("time.monotonic", return_value=mock_seconds_into_future):
         for task in list(loop._scheduled):  # type: ignore[attr-defined]
diff --git a/tests/benchmarks/test_cache_bound.py b/tests/benchmarks/test_cache_bound.py
new file mode 100644
index 00000000..774129e3
--- /dev/null
+++ b/tests/benchmarks/test_cache_bound.py
@@ -0,0 +1,68 @@
+"""Benchmark for the DNSCache record-count bound + overflow eviction."""
+
+from __future__ import annotations
+
+from collections.abc import Iterator
+from itertools import count
+
+from pytest_codspeed import BenchmarkFixture
+
+from zeroconf import DNSAddress, DNSCache, current_time_millis
+from zeroconf.const import _CLASS_IN, _MAX_CACHE_RECORDS, _TYPE_A
+
+
+def _make_records(count_: int, now: float, prefix: str = "bench") -> list[DNSAddress]:
+    return [
+        DNSAddress(
+            f"{prefix}-{i}.local.",
+            _TYPE_A,
+            _CLASS_IN,
+            120,
+            bytes(((i >> 24) & 0xFF, (i >> 16) & 0xFF, (i >> 8) & 0xFF, i & 0xFF)),
+            created=now + i,
+        )
+        for i in range(count_)
+    ]
+
+
+def _unbounded_records(now: float, prefix: str = "evict") -> Iterator[DNSAddress]:
+    """Unbounded generator of unique-name DNSAddress records."""
+    for i in count():
+        yield DNSAddress(
+            f"{prefix}-{i}.local.",
+            _TYPE_A,
+            _CLASS_IN,
+            120,
+            bytes(((i >> 24) & 0xFF, (i >> 16) & 0xFF, (i >> 8) & 0xFF, i & 0xFF)),
+            created=now + i,
+        )
+
+
+def test_cache_add_below_cap(benchmark: BenchmarkFixture) -> None:
+    """Adding records while the cache is well below the cap (no eviction)."""
+    now = current_time_millis()
+    records = _make_records(1000, now)
+
+    @benchmark
+    def _add() -> None:
+        cache = DNSCache()
+        cache.async_add_records(records)
+
+
+def test_cache_add_at_cap_evicts(benchmark: BenchmarkFixture) -> None:
+    """Steady-state add at the cap: every measured insert forces one eviction.
+
+    Pre-fills the cache to ``_MAX_CACHE_RECORDS`` outside the timed body so
+    only the eviction-path adds are measured. Each benchmark iteration
+    pulls one fresh unique record from an unbounded generator, keeping the
+    cache permanently at the cap. The generator avoids the iteration-count
+    cap that a pre-built pool would impose for very fast operations.
+    """
+    now = current_time_millis()
+    cache = DNSCache()
+    cache.async_add_records(_make_records(_MAX_CACHE_RECORDS, now, prefix="fill"))
+    pool = _unbounded_records(now + _MAX_CACHE_RECORDS)
+
+    @benchmark
+    def _evict_one() -> None:
+        cache.async_add_records([next(pool)])
diff --git a/tests/benchmarks/test_ipaddress.py b/tests/benchmarks/test_ipaddress.py
new file mode 100644
index 00000000..60aea89c
--- /dev/null
+++ b/tests/benchmarks/test_ipaddress.py
@@ -0,0 +1,48 @@
+"""Benchmarks for zeroconf._utils.ipaddress address objects."""
+
+from __future__ import annotations
+
+from pytest_codspeed import BenchmarkFixture
+
+from zeroconf._utils.ipaddress import ZeroconfIPv4Address, ZeroconfIPv6Address
+
+_IPV4_STRS = [f"10.{(i >> 8) & 0xFF}.{i & 0xFF}.1" for i in range(1000)]
+_IPV6_BYTES = [(0x20010DB8 << 96 | i).to_bytes(16, "big") for i in range(1000)]
+
+
+def test_create_ipv4_addresses(benchmark: BenchmarkFixture) -> None:
+    """Benchmark constructing 1000 distinct IPv4 address objects."""
+
+    @benchmark
+    def _create() -> None:
+        for addr in _IPV4_STRS:
+            ZeroconfIPv4Address(addr)
+
+
+def test_create_ipv6_addresses(benchmark: BenchmarkFixture) -> None:
+    """Benchmark constructing 1000 distinct IPv6 address objects."""
+
+    @benchmark
+    def _create() -> None:
+        for addr in _IPV6_BYTES:
+            ZeroconfIPv6Address(addr)
+
+
+def test_hash_ipv4_address(benchmark: BenchmarkFixture) -> None:
+    """Benchmark hashing the same IPv4 address object 1000 times."""
+    addr = ZeroconfIPv4Address("10.0.0.1")
+
+    @benchmark
+    def _hash() -> None:
+        for _ in range(1000):
+            hash(addr)
+
+
+def test_hash_ipv6_address(benchmark: BenchmarkFixture) -> None:
+    """Benchmark hashing the same IPv6 address object 1000 times."""
+    addr = ZeroconfIPv6Address(b"\x20\x01\x0d\xb8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01")
+
+    @benchmark
+    def _hash() -> None:
+        for _ in range(1000):
+            hash(addr)
diff --git a/tests/benchmarks/test_listener_dedup.py b/tests/benchmarks/test_listener_dedup.py
new file mode 100644
index 00000000..b1b500ba
--- /dev/null
+++ b/tests/benchmarks/test_listener_dedup.py
@@ -0,0 +1,128 @@
+"""Benchmarks for the listener duplicate-packet suppression hot path.
+
+These pin the cost of ``AsyncListener._process_datagram_at_time`` under
+three packet-stream shapes that exercise the dedup branch differently:
+
+- ``test_dedup_hit_same_payload`` — N copies of one payload (steady-state
+  dedup hit).
+- ``test_alternating_payloads`` — A, B, A, B, ... The single-slot
+  remembered-last-packet dedup misses on every packet because each one
+  differs from its immediate predecessor; a bounded recency window
+  dedups after the second packet. This is the flood shape from
+  issue #1724.
+- ``test_unique_payloads`` — N distinct payloads (no dedup hit possible
+  on either implementation). Measures the store/evict overhead on the
+  miss path.
+
+Downstream work is held constant across implementations by overriding
+``handle_query_or_defer`` on a subclass with a no-op, so the only
+remaining variable is the dedup decision itself.
+"""
+
+from __future__ import annotations
+
+import pytest
+from pytest_codspeed import BenchmarkFixture
+
+from zeroconf import DNSOutgoing, DNSQuestion, const
+from zeroconf._listener import AsyncListener
+from zeroconf._utils.time import current_time_millis
+from zeroconf.asyncio import AsyncZeroconf
+
+
+class _InertListener(AsyncListener):
+    """AsyncListener that skips response generation.
+
+    The dedup branch is the only piece that diverges between the
+    single-slot and bounded-window implementations. Stubbing query
+    handling keeps the per-packet cost outside the dedup branch
+    constant so the benchmark isolates the change under test.
+    """
+
+    def handle_query_or_defer(self, *args: object, **kwargs: object) -> None:  # type: ignore[override]
+        return None
+
+
+def _make_query_packet(name: str) -> bytes:
+    out = DNSOutgoing(const._FLAGS_QR_QUERY, multicast=True)
+    out.add_question(DNSQuestion(name, const._TYPE_PTR, const._CLASS_IN))
+    return out.packets()[0]
+
+
+_ITERATIONS = 200
+_ADDRS: tuple[str, int] = ("192.0.2.1", 5353)
+
+
+def _build_listener(aiozc: AsyncZeroconf) -> _InertListener:
+    zc = aiozc.zeroconf
+    # A non-empty registry keeps the realistic code path live (the early
+    # ``has_entries`` exit would otherwise bypass the per-packet work we
+    # want to measure). Toggling the flag directly avoids the event-loop
+    # round-trip that ``async_register_service`` would impose.
+    zc.registry.has_entries = True
+    listener = _InertListener(zc)
+    listener.transport = object()  # type: ignore[assignment]
+    return listener
+
+
+@pytest.mark.asyncio
+async def test_dedup_hit_same_payload(benchmark: BenchmarkFixture) -> None:
+    """Steady-state dedup hit: same payload repeated."""
+    aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
+    await aiozc.zeroconf.async_wait_for_start()
+    listener = _build_listener(aiozc)
+    packet = _make_query_packet("a._http._tcp.local.")
+    data_len = len(packet)
+    # Prime the dedup state so the first iteration is already a hit.
+    listener._process_datagram_at_time(False, data_len, current_time_millis(), packet, _ADDRS)
+
+    @benchmark
+    def _run() -> None:
+        # Single fresh timestamp keeps every call inside the
+        # suppression interval so each one is a dedup hit.
+        t = current_time_millis()
+        for _ in range(_ITERATIONS):
+            listener._process_datagram_at_time(False, data_len, t, packet, _ADDRS)
+
+    await aiozc.async_close()
+
+
+@pytest.mark.asyncio
+async def test_alternating_payloads(benchmark: BenchmarkFixture) -> None:
+    """Flood shape from issue #1724: A, B, A, B, ..."""
+    aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
+    await aiozc.zeroconf.async_wait_for_start()
+    listener = _build_listener(aiozc)
+    packet_a = _make_query_packet("a._http._tcp.local.")
+    packet_b = _make_query_packet("b._http._tcp.local.")
+    len_a = len(packet_a)
+    len_b = len(packet_b)
+
+    @benchmark
+    def _run() -> None:
+        t = current_time_millis()
+        for i in range(_ITERATIONS):
+            if i & 1:
+                listener._process_datagram_at_time(False, len_b, t, packet_b, _ADDRS)
+            else:
+                listener._process_datagram_at_time(False, len_a, t, packet_a, _ADDRS)
+
+    await aiozc.async_close()
+
+
+@pytest.mark.asyncio
+async def test_unique_payloads(benchmark: BenchmarkFixture) -> None:
+    """Stream of distinct payloads — no dedup hit on either implementation."""
+    aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
+    await aiozc.zeroconf.async_wait_for_start()
+    listener = _build_listener(aiozc)
+    packets = [_make_query_packet(f"x{i}._http._tcp.local.") for i in range(_ITERATIONS)]
+    lengths = [len(p) for p in packets]
+
+    @benchmark
+    def _run() -> None:
+        t = current_time_millis()
+        for packet, data_len in zip(packets, lengths, strict=True):
+            listener._process_datagram_at_time(False, data_len, t, packet, _ADDRS)
+
+    await aiozc.async_close()
diff --git a/tests/benchmarks/test_mark_seen.py b/tests/benchmarks/test_mark_seen.py
new file mode 100644
index 00000000..4f82da8c
--- /dev/null
+++ b/tests/benchmarks/test_mark_seen.py
@@ -0,0 +1,39 @@
+"""Benchmark for _logger._mark_seen."""
+
+from __future__ import annotations
+
+from pytest_codspeed import BenchmarkFixture
+
+from zeroconf._logger import _MAX_SEEN_LOGS, _mark_seen
+
+
+def test_mark_seen_hit(benchmark: BenchmarkFixture) -> None:
+    """Benchmark the cache-hit path (same key repeated)."""
+    seen: dict[str, None] = {"warm": None}
+
+    @benchmark
+    def _hit() -> None:
+        for _ in range(1000):
+            _mark_seen(seen, "warm")
+
+
+def test_mark_seen_fill(benchmark: BenchmarkFixture) -> None:
+    """Benchmark filling from empty up to the cap (no evictions)."""
+    keys = [f"key-{i}" for i in range(_MAX_SEEN_LOGS)]
+
+    @benchmark
+    def _fill() -> None:
+        seen: dict[str, None] = {}
+        for k in keys:
+            _mark_seen(seen, k)
+
+
+def test_mark_seen_churn(benchmark: BenchmarkFixture) -> None:
+    """Benchmark sustained eviction (every call past the cap drops oldest)."""
+    keys = [f"churn-{i}" for i in range(_MAX_SEEN_LOGS * 4)]
+
+    @benchmark
+    def _churn() -> None:
+        seen: dict[str, None] = {}
+        for k in keys:
+            _mark_seen(seen, k)
diff --git a/tests/conftest.py b/tests/conftest.py
index 531c810b..573b9394 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -3,12 +3,75 @@
 from __future__ import annotations
 
 import threading
+from collections.abc import AsyncGenerator, Generator, Iterator
 from unittest.mock import patch
 
 import pytest
+import pytest_asyncio
 
-from zeroconf import _core, const
+from zeroconf import Zeroconf, _core, const
 from zeroconf._handlers import query_handler
+from zeroconf._services import browser as service_browser
+from zeroconf._services import info as service_info
+from zeroconf.asyncio import AsyncZeroconf
+
+try:
+    from blockbuster import BlockBuster, blockbuster_ctx
+except ImportError:  # platforms without blockbuster (e.g. PyPy under QEMU)
+    BlockBuster = None  # type: ignore[assignment,misc]
+    blockbuster_ctx = None  # type: ignore[assignment]
+
+_BENCHMARKS_DIR = "tests/benchmarks"
+
+# Tests that perform sync IO inside the asyncio event loop and trip
+# blockbuster. Marked xfail (strict=False) so CI stays green; pop
+# entries as the underlying blocking calls get fixed. Most of the
+# `test_async_service_registration*` and `test_async_tasks` entries
+# share a single root cause: `Zeroconf.async_close()` -> ... ->
+# `ServiceBrowser.cancel()` calls `Thread.join()` to drain the
+# dedicated browser thread, and on Python 3.10-3.12 the thread is
+# still alive when the join happens. `test_use_asyncio_false_*` is
+# by design (sync bootstrap when `use_asyncio=False` is requested from
+# inside a running loop); `test_run_coro_with_timeout` exercises the
+# sync-from-thread bridge intentionally. The strict=False marker keeps
+# the suite green on the Python versions where the race resolves the
+# other way.
+_KNOWN_BLOCKING: frozenset[str] = frozenset(
+    {
+        "tests/test_asyncio.py::test_async_service_registration",
+        "tests/test_asyncio.py::test_async_service_registration_with_server_missing",
+        "tests/test_asyncio.py::test_async_service_registration_same_server_different_ports",
+        "tests/test_asyncio.py::test_async_service_registration_same_server_same_ports",
+        "tests/test_asyncio.py::test_async_tasks",
+        "tests/test_core.py::Framework::test_use_asyncio_false_forces_thread_when_loop_running",
+        "tests/utils/test_asyncio.py::test_run_coro_with_timeout",
+    }
+)
+
+
+def pytest_collection_modifyitems(config: pytest.Config, items: list[pytest.Item]) -> None:
+    """Mark known-blocking tests xfail so blockbuster doesn't fail the suite."""
+    if blockbuster_ctx is None:
+        return
+    marker = pytest.mark.xfail(
+        reason="blockbuster: blocking call in asyncio path",
+        strict=False,
+    )
+    for item in items:
+        if item.nodeid in _KNOWN_BLOCKING:
+            item.add_marker(marker)
+
+
+@pytest.fixture(autouse=True)
+def blockbuster(
+    request: pytest.FixtureRequest,
+) -> Iterator[BlockBuster | None]:
+    """Fail any test that performs a blocking call inside the asyncio loop."""
+    if blockbuster_ctx is None or _BENCHMARKS_DIR in str(request.node.fspath):
+        yield None
+        return
+    with blockbuster_ctx() as bb:
+        yield bb
 
 
 @pytest.fixture(autouse=True)
@@ -20,6 +83,36 @@ def verify_threads_ended():
     assert not threads
 
 
+@pytest.fixture
+def zc_loopback() -> Generator[Zeroconf]:
+    """Yield a loopback `Zeroconf` and close it on teardown.
+
+    Replaces the inline `zc = Zeroconf(interfaces=["127.0.0.1"])` +
+    explicit `zc.close()` pattern duplicated across the suite. Calling
+    `zc.close()` inside a test is still safe — `close()` is idempotent.
+    """
+    zc = Zeroconf(interfaces=["127.0.0.1"])
+    try:
+        yield zc
+    finally:
+        zc.close()
+
+
+@pytest_asyncio.fixture
+async def aiozc_loopback() -> AsyncGenerator[AsyncZeroconf]:
+    """Yield a loopback `AsyncZeroconf` and close it on teardown.
+
+    Replaces the inline `aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])`
+    + explicit `await aiozc.async_close()` pattern duplicated across the
+    suite. Calling `async_close()` inside a test is still safe.
+    """
+    aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
+    try:
+        yield aiozc
+    finally:
+        await aiozc.async_close()
+
+
 @pytest.fixture
 def run_isolated():
     """Change the mDNS port to run the test in isolation."""
@@ -40,3 +133,76 @@ def disable_duplicate_packet_suppression():
     """
     with patch.object(const, "_DUPLICATE_PACKET_SUPPRESSION_INTERVAL", 0):
         yield
+
+
+@pytest.fixture
+def quick_timing() -> Generator[None]:
+    """Shorten the probe/announce/goodbye/first-query intervals for tests on loopback.
+
+    The production values (_CHECK_TIME=500ms, _REGISTER_TIME=225ms,
+    _UNREGISTER_TIME=125ms, _PROBE_RANDOM_DELAY_INTERVAL=150-250ms,
+    _FIRST_QUERY_DELAY_RANDOM_INTERVAL=20-120ms) exist for RFC 6762
+    interop on real networks (§8.1 thundering-herd avoidance for
+    probing, §5.2 for the initial-query delay). Tests on 127.0.0.1
+    do not need them and pay 1-2s per register/unregister cycle,
+    150-250ms per probe, and 20-120ms per ServiceBrowser startup
+    without this fixture. Opt in either by adding `quick_timing`
+    to a test's argument list or via
+    `@pytest.mark.usefixtures("quick_timing")` on the test or
+    its class.
+    """
+    with (
+        patch.object(_core, "_CHECK_TIME", 10),
+        patch.object(_core, "_REGISTER_TIME", 10),
+        patch.object(_core, "_UNREGISTER_TIME", 10),
+        patch.object(_core, "_PROBE_RANDOM_DELAY_INTERVAL", (1, 5)),
+        patch.object(service_browser, "_FIRST_QUERY_DELAY_RANDOM_INTERVAL", (1, 5)),
+    ):
+        yield
+
+
+@pytest.fixture
+def quick_aggregation_timing() -> Generator[None]:
+    """Scale multicast aggregation / network-protection delays 10x for tests.
+
+    The aggregation tests in `tests/test_handlers.py` verify timing-
+    dependent behaviour of `MulticastOutgoingQueue`: aggregation window,
+    network protection (~1s), and protected aggregation. The behaviour
+    under test is a ratio of these constants — the exact wall-clock
+    values are not the contract — so scaling them down and the test
+    sleeps in lock-step preserves what is tested while dropping each
+    test from ~3s to ~0.3s.
+
+    The patches must be in place before `AsyncZeroconf(...)` is
+    constructed because `MulticastOutgoingQueue` reads the constants at
+    init time and stashes them on the instance. The per-queue
+    `_multicast_delay_random_min` / `_max` jitter (1-5ms here) can
+    still be set on the queue instance after construction by the test
+    itself — those slots are `cdef public` in the .pxd.
+    """
+    with (
+        patch.object(_core, "_AGGREGATION_DELAY", 50),
+        patch.object(_core, "_PROTECTED_AGGREGATION_DELAY", 20),
+        patch.object(_core, "_ONE_SECOND", 100),
+    ):
+        yield
+
+
+@pytest.fixture
+def quick_request_timing() -> Generator[None]:
+    """Shorten the initial-query delay used by AsyncServiceInfo.async_request.
+
+    The 200ms `_LISTENER_TIME` and 20-120ms random jitter (RFC 6762
+    §5.2) help spread queries from multiple clients on real networks.
+    On loopback they're pure overhead — get_service_info-style tests
+    wait ~250ms before the first query even fires. Opt in either by
+    adding `quick_request_timing` to a test's argument list or via
+    `@pytest.mark.usefixtures("quick_request_timing")` on the test
+    or its class, then drop the test's own timeouts (which had to
+    accommodate that delay).
+    """
+    with (
+        patch.object(service_info, "_LISTENER_TIME", 10),
+        patch.object(service_info, "_AVOID_SYNC_DELAY_RANDOM_INTERVAL", (1, 5)),
+    ):
+        yield
diff --git a/tests/services/test_browser.py b/tests/services/test_browser.py
index e9135bb6..28b3d12e 100644
--- a/tests/services/test_browser.py
+++ b/tests/services/test_browser.py
@@ -8,7 +8,6 @@
 import socket
 import time
 import unittest
-from collections.abc import Iterable
 from threading import Event
 from typing import cast
 from unittest.mock import patch
@@ -36,6 +35,7 @@
     _inject_response,
     _wait_for_start,
     has_working_ipv6,
+    mock_incoming_msg,
     time_changed_millis,
 )
 
@@ -54,13 +54,6 @@ def teardown_module():
         log.setLevel(original_logging_level)
 
 
-def mock_incoming_msg(records: Iterable[r.DNSRecord]) -> r.DNSIncoming:
-    generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
-    for record in records:
-        generated.add_answer_at_time(record, 0)
-    return r.DNSIncoming(generated.packets()[0])
-
-
 def test_service_browser_cancel_multiple_times():
     """Test we can cancel a ServiceBrowser multiple times before close."""
 
@@ -227,10 +220,7 @@ def mock_record_update_incoming_msg(
             generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
             assert generated.is_response() is True
 
-            if service_state_change == r.ServiceStateChange.Removed:
-                ttl = 0
-            else:
-                ttl = 120
+            ttl = 0 if service_state_change == r.ServiceStateChange.Removed else 120
 
             generated.add_answer_at_time(
                 r.DNSText(
@@ -334,7 +324,9 @@ def mock_record_update_incoming_msg(
             service_updated_event.clear()
             service_text = b"path=/~matt2/"
             _inject_response(zeroconf, mock_record_update_incoming_msg(r.ServiceStateChange.Updated))
-            service_updated_event.wait(wait_time)
+            # Negative assertion: a duplicate update must NOT fire the listener. The wait
+            # always times out, so keep the budget short rather than reusing wait_time.
+            service_updated_event.wait(0.3)
             assert service_added_count == 1
             assert service_updated_count == 2
             assert service_removed_count == 0
@@ -557,7 +549,7 @@ def on_service_state_change(zeroconf, service_type, state_change, name):
 
 
 @pytest.mark.asyncio
-async def test_asking_default_is_asking_qm_questions_after_the_first_qu():
+async def test_asking_default_is_asking_qm_questions_after_the_first_qu(quick_timing: None) -> None:
     """Verify the service browser's first questions are QU and refresh queries are QM."""
     service_added = asyncio.Event()
     service_removed = asyncio.Event()
@@ -659,7 +651,7 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
 
 
 @pytest.mark.asyncio
-async def test_ttl_refresh_cancelled_rescue_query():
+async def test_ttl_refresh_cancelled_rescue_query(quick_timing: None) -> None:
     """Verify seeing a name again cancels the rescue query."""
     service_added = asyncio.Event()
     service_removed = asyncio.Event()
@@ -847,7 +839,7 @@ def on_service_state_change(zeroconf, service_type, state_change, name):
             await aiozc.async_close()
 
 
-def test_legacy_record_update_listener():
+def test_legacy_record_update_listener(quick_timing: None) -> None:
     """Test a RecordUpdateListener that does not implement update_records."""
 
     # instantiate a zeroconf instance
@@ -1034,7 +1026,7 @@ def update_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-de
 
 
 def test_service_browser_listeners_no_update_service():
-    """Test that the ServiceBrowser ServiceListener that does not implement update_service."""
+    """A listener that ignores update events records only add/remove callbacks."""
 
     # instantiate a zeroconf instance
     zc = Zeroconf(interfaces=["127.0.0.1"])
@@ -1052,6 +1044,9 @@ def remove_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-de
             if name == registration_name:
                 callbacks.append(("remove", type_, name))
 
+        def update_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-def]
+            pass
+
     listener = MyServiceListener()
 
     browser = r.ServiceBrowser(zc, type_, None, listener)
@@ -1090,6 +1085,73 @@ def remove_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-de
     zc.close()
 
 
+def test_service_browser_nsec_record_does_not_trigger_update():
+    """NSEC records assert non-existence and must not fire ServiceStateChange.Updated."""
+    zc = Zeroconf(interfaces=["127.0.0.1"])
+    type_ = "_hap._tcp.local."
+    registration_name = f"xxxyyy.{type_}"
+    callbacks: list[tuple[str, str, str]] = []
+    service_added = Event()
+
+    class MyServiceListener(r.ServiceListener):
+        def add_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-def]
+            if name == registration_name:
+                callbacks.append(("add", type_, name))
+                service_added.set()
+
+        def remove_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-def]
+            if name == registration_name:
+                callbacks.append(("remove", type_, name))
+
+        def update_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-def]
+            if name == registration_name:
+                callbacks.append(("update", type_, name))
+
+    listener = MyServiceListener()
+    browser = r.ServiceBrowser(zc, type_, None, listener)
+    try:
+        desc = {"path": "/~paulsm/"}
+        address = socket.inet_aton("10.0.1.2")
+        info = ServiceInfo(type_, registration_name, 80, 0, 0, desc, "ash-2.local.", addresses=[address])
+
+        _inject_response(
+            zc,
+            mock_incoming_msg(
+                [
+                    info.dns_pointer(),
+                    info.dns_service(),
+                    info.dns_text(),
+                    *info.dns_addresses(),
+                ]
+            ),
+        )
+        assert service_added.wait(timeout=5), "add_service callback never fired"
+
+        # NSEC inject runs synchronously through the event loop; once
+        # _inject_response returns, async_update_records has already
+        # decided not to enqueue a callback for the NSEC record.
+        _inject_response(
+            zc,
+            mock_incoming_msg(
+                [
+                    r.DNSNsec(
+                        registration_name,
+                        const._TYPE_NSEC,
+                        const._CLASS_IN | const._CLASS_UNIQUE,
+                        const._DNS_OTHER_TTL,
+                        registration_name,
+                        [const._TYPE_AAAA],
+                    ),
+                ]
+            ),
+        )
+
+        assert callbacks == [("add", type_, registration_name)]
+    finally:
+        browser.cancel()
+        zc.close()
+
+
 def test_service_browser_uses_non_strict_names():
     """Verify we can look for technically invalid names as we cannot change what others do."""
 
@@ -1500,10 +1562,15 @@ def update_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-de
     # Force the ttl to be 1 second
     now = current_time_millis()
     for cache_record in list(zc.cache.cache.values()):
-        for record in cache_record:
+        for record in cache_record.values():
             zc.cache._async_set_created_ttl(record, now, 1)
 
-    time.sleep(0.3)
+    # Wait for the add callback to fire from the original inject_response.
+    for _ in range(30):
+        time.sleep(0.01)
+        if len(callbacks) == 1:
+            break
+
     info.port = 400
     info._dns_service_cache = None  # we are mutating the record so clear the cache
 
@@ -1512,8 +1579,8 @@ def update_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-de
         mock_incoming_msg([info.dns_service()]),
     )
 
-    for _ in range(10):
-        time.sleep(0.05)
+    for _ in range(30):
+        time.sleep(0.01)
         if len(callbacks) == 2:
             break
 
@@ -1522,8 +1589,19 @@ def update_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-de
         ("update", type_, registration_name),
     ]
 
-    for _ in range(25):
-        time.sleep(0.05)
+    # Re-add every cached record with `created` in the past so the
+    # next reaper tick (0.01s) expires them and fires the remove
+    # callback, instead of waiting the full TTL in real time.
+    # Going through `_async_set_created_ttl` updates the expiration
+    # heap; mutating `record.created` directly would leave the heap
+    # entry pointing at the original `when` so the reaper never wakes.
+    past = current_time_millis() - 2000
+    for cache_record in list(zc.cache.cache.values()):
+        for record in list(cache_record.values()):
+            zc.cache._async_set_created_ttl(record, past, 1)
+
+    for _ in range(30):
+        time.sleep(0.01)
         if len(callbacks) == 3:
             break
 
@@ -1568,16 +1646,15 @@ def test_scheduled_ptr_query_dunder_methods():
 
 
 @pytest.mark.asyncio
-async def test_close_zeroconf_without_browser_before_start_up_queries():
+async def test_close_zeroconf_without_browser_before_start_up_queries(quick_timing: None) -> None:
     """Test that we stop sending startup queries if zeroconf is closed out from under the browser."""
     service_added = asyncio.Event()
     type_ = "_http._tcp.local."
     registration_name = f"xxxyyy.{type_}"
 
     def on_service_state_change(zeroconf, service_type, state_change, name):
-        if name == registration_name:
-            if state_change is ServiceStateChange.Added:
-                service_added.set()
+        if name == registration_name and state_change is ServiceStateChange.Added:
+            service_added.set()
 
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     zeroconf_browser = aiozc.zeroconf
@@ -1636,7 +1713,7 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
 
 
 @pytest.mark.asyncio
-async def test_close_zeroconf_without_browser_after_start_up_queries():
+async def test_close_zeroconf_without_browser_after_start_up_queries(quick_timing: None) -> None:
     """Test that we stop sending rescue queries if zeroconf is closed out from under the browser."""
     service_added = asyncio.Event()
 
@@ -1644,9 +1721,8 @@ async def test_close_zeroconf_without_browser_after_start_up_queries():
     registration_name = f"xxxyyy.{type_}"
 
     def on_service_state_change(zeroconf, service_type, state_change, name):
-        if name == registration_name:
-            if state_change is ServiceStateChange.Added:
-                service_added.set()
+        if name == registration_name and state_change is ServiceStateChange.Added:
+            service_added.set()
 
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     zeroconf_browser = aiozc.zeroconf
diff --git a/tests/services/test_info.py b/tests/services/test_info.py
index 660b56d2..219f5226 100644
--- a/tests/services/test_info.py
+++ b/tests/services/test_info.py
@@ -8,7 +8,6 @@
 import socket
 import threading
 import unittest
-from collections.abc import Iterable
 from ipaddress import ip_address
 from threading import Event
 from unittest.mock import patch
@@ -19,11 +18,12 @@
 from zeroconf import DNSAddress, RecordUpdate, const
 from zeroconf._protocol.outgoing import DNSOutgoing
 from zeroconf._services import info
-from zeroconf._services.info import ServiceInfo
+from zeroconf._services.info import ServiceInfo, _has_more_scope_info
+from zeroconf._utils.ipaddress import ZeroconfIPv4Address
 from zeroconf._utils.net import IPVersion
 from zeroconf.asyncio import AsyncZeroconf
 
-from .. import _inject_response, has_working_ipv6
+from .. import QUICK_REQUEST_TIMEOUT_MS, _inject_response, has_working_ipv6, mock_incoming_msg
 
 log = logging.getLogger("zeroconf")
 original_logging_level = logging.NOTSET
@@ -252,6 +252,7 @@ def test_service_info_rejects_expired_records(self):
 
     @unittest.skipIf(not has_working_ipv6(), "Requires IPv6")
     @unittest.skipIf(os.environ.get("SKIP_IPV6"), "IPv6 tests disabled")
+    @pytest.mark.usefixtures("quick_request_timing")
     def test_get_info_partial(self):
         zc = r.Zeroconf(interfaces=["127.0.0.1"])
 
@@ -279,14 +280,6 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
         # patch the zeroconf send
         with patch.object(zc, "async_send", send):
 
-            def mock_incoming_msg(records: Iterable[r.DNSRecord]) -> r.DNSIncoming:
-                generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
-
-                for record in records:
-                    generated.add_answer_at_time(record, 0)
-
-                return r.DNSIncoming(generated.packets()[0])
-
             def get_service_info_helper(zc, type, name):
                 nonlocal service_info
                 service_info = zc.get_service_info(type, name)
@@ -422,26 +415,40 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
         # patch the zeroconf send
         with patch.object(zc, "async_send", send):
 
-            def mock_incoming_msg(records: Iterable[r.DNSRecord]) -> r.DNSIncoming:
-                generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
-
-                for record in records:
-                    generated.add_answer_at_time(record, 0)
-
-                return r.DNSIncoming(generated.packets()[0])
-
-            def get_service_info_helper(zc, type, name):
+            def get_service_info_helper(zc, type, name, timeout):
                 nonlocal service_info
-                service_info = zc.get_service_info(type, name)
+                service_info = zc.get_service_info(type, name, timeout)
                 service_info_event.set()
 
             try:
+                # Seed TXT/A/AAAA with a far-future `than` before the
+                # helper thread starts. The first (QU) query bypasses
+                # suppression so phase 1 still observes 4 questions; the
+                # second (QM) query fires ~220-320ms after the first, too
+                # tight a window to seed reliably from the test thread on
+                # slow runners. async_expire only removes entries where
+                # now - than > _DUPLICATE_QUESTION_INTERVAL, so future-
+                # dated entries persist for the duration of the test.
+                seed_history_questions = (
+                    r.DNSQuestion(service_name, const._TYPE_A, const._CLASS_IN),
+                    r.DNSQuestion(service_name, const._TYPE_AAAA, const._CLASS_IN),
+                    r.DNSQuestion(service_name, const._TYPE_TXT, const._CLASS_IN),
+                )
+                far_future = r.current_time_millis() + 60_000
+                for question in seed_history_questions:
+                    zc.question_history.add_question_at_time(question, far_future, set())
+
+                # No answers ever come back (all queries are suppressed),
+                # so cap the helper at the worst-case sum of the three
+                # phase waits below plus margin instead of the 3000ms
+                # default. Phase 3 waits ~1.6s (the 999ms QM gap plus
+                # jitter and 500ms buffer); 1500ms covers it.
                 helper_thread = threading.Thread(
                     target=get_service_info_helper,
-                    args=(zc, service_type, service_name),
+                    args=(zc, service_type, service_name, 1500),
                 )
                 helper_thread.start()
-                wait_time = (const._LISTENER_TIME + info._AVOID_SYNC_DELAY_RANDOM_INTERVAL[1] + 5) / 1000
+                wait_time = (const._LISTENER_TIME + info._AVOID_SYNC_DELAY_RANDOM_INTERVAL[1] + 500) / 1000
 
                 # Expect query for SRV, TXT, A, AAAA
                 send_event.wait(wait_time)
@@ -457,64 +464,29 @@ def get_service_info_helper(zc, type, name):
                 # by the question history
                 last_sent = None
                 send_event.clear()
-                for _ in range(3):
-                    send_event.wait(
-                        wait_time * 0.25
-                    )  # Wait long enough to be inside the question history window
-                    now = r.current_time_millis()
-                    zc.question_history.add_question_at_time(
-                        r.DNSQuestion(service_name, const._TYPE_A, const._CLASS_IN),
-                        now,
-                        set(),
-                    )
-                    zc.question_history.add_question_at_time(
-                        r.DNSQuestion(service_name, const._TYPE_AAAA, const._CLASS_IN),
-                        now,
-                        set(),
-                    )
-                    zc.question_history.add_question_at_time(
-                        r.DNSQuestion(service_name, const._TYPE_TXT, const._CLASS_IN),
-                        now,
-                        set(),
-                    )
-                send_event.wait(wait_time * 0.25)
+                send_event.wait(wait_time)
                 assert last_sent is not None
                 assert len(last_sent.questions) == 1  # type: ignore[unreachable]
                 assert r.DNSQuestion(service_name, const._TYPE_SRV, const._CLASS_IN) in last_sent.questions
                 assert service_info is None
 
+                # Future-date SRV too: the SRV entry added by the previous
+                # QM query has `than = now`, so it expires after
+                # _DUPLICATE_QUESTION_INTERVAL — before the next scheduled
+                # QM query (~1s + jitter later).
+                zc.question_history.add_question_at_time(
+                    r.DNSQuestion(service_name, const._TYPE_SRV, const._CLASS_IN),
+                    r.current_time_millis() + 60_000,
+                    set(),
+                )
+
                 wait_time = (
-                    const._DUPLICATE_QUESTION_INTERVAL + info._AVOID_SYNC_DELAY_RANDOM_INTERVAL[1] + 5
+                    const._DUPLICATE_QUESTION_INTERVAL + info._AVOID_SYNC_DELAY_RANDOM_INTERVAL[1] + 500
                 ) / 1000
                 # Expect no queries as all are suppressed by the question history
                 last_sent = None
                 send_event.clear()
-                for _ in range(3):
-                    send_event.wait(
-                        wait_time * 0.25
-                    )  # Wait long enough to be inside the question history window
-                    now = r.current_time_millis()
-                    zc.question_history.add_question_at_time(
-                        r.DNSQuestion(service_name, const._TYPE_A, const._CLASS_IN),
-                        now,
-                        set(),
-                    )
-                    zc.question_history.add_question_at_time(
-                        r.DNSQuestion(service_name, const._TYPE_AAAA, const._CLASS_IN),
-                        now,
-                        set(),
-                    )
-                    zc.question_history.add_question_at_time(
-                        r.DNSQuestion(service_name, const._TYPE_TXT, const._CLASS_IN),
-                        now,
-                        set(),
-                    )
-                    zc.question_history.add_question_at_time(
-                        r.DNSQuestion(service_name, const._TYPE_SRV, const._CLASS_IN),
-                        now,
-                        set(),
-                    )
-                send_event.wait(wait_time * 0.25)
+                send_event.wait(wait_time)
                 # All questions are suppressed so no query should be sent
                 assert last_sent is None
                 assert service_info is None
@@ -524,6 +496,7 @@ def get_service_info_helper(zc, type, name):
                 zc.remove_all_service_listeners()
                 zc.close()
 
+    @pytest.mark.usefixtures("quick_request_timing")
     def test_get_info_single(self):
         zc = r.Zeroconf(interfaces=["127.0.0.1"])
 
@@ -534,91 +507,82 @@ def test_get_info_single(self):
         service_address = "10.0.1.2"
 
         service_info = None
-        send_event = Event()
         service_info_event = Event()
 
-        last_sent: r.DNSOutgoing | None = None
+        ttl = 120
+        response_records = [
+            r.DNSText(
+                service_name,
+                const._TYPE_TXT,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                ttl,
+                service_text,
+            ),
+            r.DNSService(
+                service_name,
+                const._TYPE_SRV,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                ttl,
+                0,
+                0,
+                80,
+                service_server,
+            ),
+            r.DNSAddress(
+                service_server,
+                const._TYPE_A,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                ttl,
+                socket.inet_pton(socket.AF_INET, service_address),
+            ),
+        ]
 
-        def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
-            """Sends an outgoing packet."""
-            nonlocal last_sent
+        sent_queries: list[r.DNSOutgoing] = []
 
-            last_sent = out
-            send_event.set()
+        def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
+            """Capture each query and, on the first one, fill the cache
+            inline so the next iteration of `async_request` finds
+            `_is_complete=True` and exits without sending another query.
+
+            Running the inject from inside `send` keeps it on the event
+            loop thread and atomic with the first send — eliminating the
+            test-thread → `run_coroutine_threadsafe` race that flaked
+            under PyPy + use_cython when `quick_request_timing` shortens
+            the inter-iteration delay to ~15ms.
+            """
+            sent_queries.append(out)
+            if len(sent_queries) == 1:
+                zc.record_manager.async_updates_from_response(mock_incoming_msg(response_records))
+
+        def get_service_info_helper(zc, type, name):
+            nonlocal service_info
+            service_info = zc.get_service_info(type, name)
+            service_info_event.set()
 
         # patch the zeroconf send
         with patch.object(zc, "async_send", send):
-
-            def mock_incoming_msg(records: Iterable[r.DNSRecord]) -> r.DNSIncoming:
-                generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
-
-                for record in records:
-                    generated.add_answer_at_time(record, 0)
-
-                return r.DNSIncoming(generated.packets()[0])
-
-            def get_service_info_helper(zc, type, name):
-                nonlocal service_info
-                service_info = zc.get_service_info(type, name)
-                service_info_event.set()
-
             try:
-                ttl = 120
                 helper_thread = threading.Thread(
                     target=get_service_info_helper,
                     args=(zc, service_type, service_name),
                 )
                 helper_thread.start()
-                wait_time = 1
 
-                # Expect query for SRV, TXT, A, AAAA
-                send_event.wait(wait_time)
-                assert last_sent is not None
-                assert len(last_sent.questions) == 4
-                assert r.DNSQuestion(service_name, const._TYPE_SRV, const._CLASS_IN) in last_sent.questions
-                assert r.DNSQuestion(service_name, const._TYPE_TXT, const._CLASS_IN) in last_sent.questions
-                assert r.DNSQuestion(service_name, const._TYPE_A, const._CLASS_IN) in last_sent.questions
-                assert r.DNSQuestion(service_name, const._TYPE_AAAA, const._CLASS_IN) in last_sent.questions
-                assert service_info is None
-
-                # Expect no further queries
-                last_sent = None
-                send_event.clear()
-                _inject_response(
-                    zc,
-                    mock_incoming_msg(
-                        [
-                            r.DNSText(
-                                service_name,
-                                const._TYPE_TXT,
-                                const._CLASS_IN | const._CLASS_UNIQUE,
-                                ttl,
-                                service_text,
-                            ),
-                            r.DNSService(
-                                service_name,
-                                const._TYPE_SRV,
-                                const._CLASS_IN | const._CLASS_UNIQUE,
-                                ttl,
-                                0,
-                                0,
-                                80,
-                                service_server,
-                            ),
-                            r.DNSAddress(
-                                service_server,
-                                const._TYPE_A,
-                                const._CLASS_IN | const._CLASS_UNIQUE,
-                                ttl,
-                                socket.inet_pton(socket.AF_INET, service_address),
-                            ),
-                        ]
-                    ),
-                )
-                send_event.wait(wait_time)
-                assert last_sent is None
+                # Helper should complete promptly — the inline inject in
+                # `send` populates the cache before the request loop's
+                # next iteration.
+                service_info_event.wait(1)
                 assert service_info is not None
 
+                # First (and only) query: QU for SRV/TXT/A/AAAA.
+                assert len(sent_queries) == 1
+                first_sent = sent_queries[0]
+                assert len(first_sent.questions) == 4
+                assert r.DNSQuestion(service_name, const._TYPE_SRV, const._CLASS_IN) in first_sent.questions
+                assert r.DNSQuestion(service_name, const._TYPE_TXT, const._CLASS_IN) in first_sent.questions
+                assert r.DNSQuestion(service_name, const._TYPE_A, const._CLASS_IN) in first_sent.questions
+                assert r.DNSQuestion(service_name, const._TYPE_AAAA, const._CLASS_IN) in first_sent.questions
+
             finally:
                 helper_thread.join()
                 zc.remove_all_service_listeners()
@@ -827,6 +791,222 @@ def test_scoped_addresses_from_cache():
     zeroconf.close()
 
 
+def test_scoped_address_preferred_when_unscoped_arrives_first_in_cache():
+    """A scoped AAAA in the cache wins over an earlier unscoped copy of the same address."""
+    type_ = "_http._tcp.local."
+    registration_name = f"scoped-first.{type_}"
+    zeroconf = r.Zeroconf(interfaces=["127.0.0.1"])
+    host = "scoped-first.local."
+    packed = socket.inet_pton(socket.AF_INET6, "fe80::52e:c2f2:bc5f:e9c6")
+
+    zeroconf.cache.async_add_records(
+        [
+            r.DNSPointer(
+                type_,
+                const._TYPE_PTR,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                registration_name,
+            ),
+            r.DNSService(
+                registration_name,
+                const._TYPE_SRV,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                0,
+                0,
+                80,
+                host,
+            ),
+            r.DNSAddress(
+                host,
+                const._TYPE_AAAA,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                packed,
+                scope_id=None,
+            ),
+            r.DNSAddress(
+                host,
+                const._TYPE_AAAA,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                packed,
+                scope_id=7,
+            ),
+        ]
+    )
+
+    info = ServiceInfo(type_, registration_name)
+    info.load_from_cache(zeroconf)
+    assert info.parsed_scoped_addresses() == ["fe80::52e:c2f2:bc5f:e9c6%7"]
+    assert info.ip_addresses_by_version(r.IPVersion.V6Only) == [ip_address("fe80::52e:c2f2:bc5f:e9c6%7")]
+    zeroconf.close()
+
+
+@pytest.mark.asyncio
+async def test_scoped_address_replaces_unscoped_in_live_update():
+    """A late-arriving scoped AAAA replaces a previously-stored unscoped variant."""
+    type_ = "_http._tcp.local."
+    registration_name = f"scoped-live.{type_}"
+    aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
+    host = "scoped-live.local."
+    packed = socket.inet_pton(socket.AF_INET6, "fe80::52e:c2f2:bc5f:e9c6")
+
+    info = ServiceInfo(type_, registration_name, server=host)
+    now = r.current_time_millis()
+    unscoped = r.DNSAddress(
+        host,
+        const._TYPE_AAAA,
+        const._CLASS_IN | const._CLASS_UNIQUE,
+        120,
+        packed,
+        scope_id=None,
+    )
+    scoped = r.DNSAddress(
+        host,
+        const._TYPE_AAAA,
+        const._CLASS_IN | const._CLASS_UNIQUE,
+        120,
+        packed,
+        scope_id=9,
+    )
+    info.async_update_records(aiozc.zeroconf, now, [RecordUpdate(unscoped, None)])
+    assert info.parsed_scoped_addresses() == ["fe80::52e:c2f2:bc5f:e9c6"]
+    info.async_update_records(aiozc.zeroconf, now, [RecordUpdate(scoped, unscoped)])
+    assert info.parsed_scoped_addresses() == ["fe80::52e:c2f2:bc5f:e9c6%9"]
+    await aiozc.async_close()
+
+
+def test_scoped_address_kept_when_unscoped_arrives_after_in_cache():
+    """Scoped AAAA seen first in iteration keeps its scope when an unscoped duplicate follows."""
+    type_ = "_http._tcp.local."
+    registration_name = f"scoped-after.{type_}"
+    zeroconf = r.Zeroconf(interfaces=["127.0.0.1"])
+    host = "scoped-after.local."
+    packed = socket.inet_pton(socket.AF_INET6, "fe80::52e:c2f2:bc5f:e9c6")
+
+    zeroconf.cache.async_add_records(
+        [
+            r.DNSPointer(
+                type_,
+                const._TYPE_PTR,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                registration_name,
+            ),
+            r.DNSService(
+                registration_name,
+                const._TYPE_SRV,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                0,
+                0,
+                80,
+                host,
+            ),
+            r.DNSAddress(
+                host,
+                const._TYPE_AAAA,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                packed,
+                scope_id=5,
+            ),
+            r.DNSAddress(
+                host,
+                const._TYPE_AAAA,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                packed,
+                scope_id=None,
+            ),
+        ]
+    )
+
+    info = ServiceInfo(type_, registration_name)
+    info.load_from_cache(zeroconf)
+    assert info.parsed_scoped_addresses() == ["fe80::52e:c2f2:bc5f:e9c6%5"]
+    assert info.ip_addresses_by_version(r.IPVersion.V6Only) == [ip_address("fe80::52e:c2f2:bc5f:e9c6%5")]
+    zeroconf.close()
+
+
+def test_has_more_scope_info_returns_false_for_ipv4():
+    """The scope_id helper short-circuits for IPv4 since A records carry no scope."""
+    ip4 = ZeroconfIPv4Address("192.0.2.1")
+    assert _has_more_scope_info(ip4, ip4) is False
+
+
+def test_scope_upgrade_preserves_lifo_recency_order():
+    """A scoped AAAA that upgrades an earlier entry becomes the most recent in LIFO order."""
+    type_ = "_http._tcp.local."
+    registration_name = f"reorder.{type_}"
+    zeroconf = r.Zeroconf(interfaces=["127.0.0.1"])
+    host = "reorder.local."
+    link_local = socket.inet_pton(socket.AF_INET6, "fe80::52e:c2f2:bc5f:e9c6")
+    ula = socket.inet_pton(socket.AF_INET6, "fdc8:d776:7cca:46ed::2")
+
+    zeroconf.cache.async_add_records(
+        [
+            r.DNSPointer(
+                type_,
+                const._TYPE_PTR,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                registration_name,
+            ),
+            r.DNSService(
+                registration_name,
+                const._TYPE_SRV,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                0,
+                0,
+                80,
+                host,
+            ),
+            r.DNSAddress(
+                host,
+                const._TYPE_AAAA,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                link_local,
+                scope_id=None,
+            ),
+            r.DNSAddress(
+                host,
+                const._TYPE_AAAA,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                ula,
+                scope_id=None,
+            ),
+            r.DNSAddress(
+                host,
+                const._TYPE_AAAA,
+                const._CLASS_IN | const._CLASS_UNIQUE,
+                120,
+                link_local,
+                scope_id=11,
+            ),
+        ]
+    )
+
+    info = ServiceInfo(type_, registration_name)
+    info.load_from_cache(zeroconf)
+    # The scoped link-local upgrade is the most recent observation, so it
+    # has to come first in LIFO order, ahead of the earlier unrelated ULA.
+    assert info.ip_addresses_by_version(r.IPVersion.V6Only) == [
+        ip_address("fe80::52e:c2f2:bc5f:e9c6%11"),
+        ip_address("fdc8:d776:7cca:46ed::2"),
+    ]
+    assert info.parsed_scoped_addresses() == [
+        "fe80::52e:c2f2:bc5f:e9c6%11",
+        "fdc8:d776:7cca:46ed::2",
+    ]
+    zeroconf.close()
+
+
 # This test uses asyncio because it needs to access the cache directly
 # which is not threadsafe
 @pytest.mark.asyncio
@@ -998,7 +1178,7 @@ def test_serviceinfo_accepts_bytes_or_string_dict():
     assert info_service.dns_text().text == b"\x0epath=/~paulsm/"
 
 
-def test_asking_qu_questions():
+def test_asking_qu_questions(quick_request_timing):
     """Verify explicitly asking QU questions."""
     type_ = "_quservice._tcp.local."
     zeroconf = r.Zeroconf(interfaces=["127.0.0.1"])
@@ -1017,12 +1197,14 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT):
 
     # patch the zeroconf send
     with patch.object(zeroconf, "async_send", send):
-        zeroconf.get_service_info(f"name.{type_}", type_, 500, question_type=r.DNSQuestionType.QU)
+        zeroconf.get_service_info(
+            f"name.{type_}", type_, QUICK_REQUEST_TIMEOUT_MS, question_type=r.DNSQuestionType.QU
+        )
         assert first_outgoing.questions[0].unicast is True  # type: ignore[union-attr]
         zeroconf.close()
 
 
-def test_asking_qm_questions():
+def test_asking_qm_questions(quick_request_timing):
     """Verify explicitly asking QM questions."""
     type_ = "_quservice._tcp.local."
     zeroconf = r.Zeroconf(interfaces=["127.0.0.1"])
@@ -1041,7 +1223,9 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT):
 
     # patch the zeroconf send
     with patch.object(zeroconf, "async_send", send):
-        zeroconf.get_service_info(f"name.{type_}", type_, 500, question_type=r.DNSQuestionType.QM)
+        zeroconf.get_service_info(
+            f"name.{type_}", type_, QUICK_REQUEST_TIMEOUT_MS, question_type=r.DNSQuestionType.QM
+        )
         assert first_outgoing.questions[0].unicast is False  # type: ignore[union-attr]
         zeroconf.close()
 
@@ -1050,12 +1234,12 @@ def test_request_timeout():
     """Test that the timeout does not throw an exception and finishes close to the actual timeout."""
     zeroconf = r.Zeroconf(interfaces=["127.0.0.1"])
     start_time = r.current_time_millis()
-    assert zeroconf.get_service_info("_notfound.local.", "notthere._notfound.local.") is None
+    assert zeroconf.get_service_info("_notfound.local.", "notthere._notfound.local.", timeout=200) is None
     end_time = r.current_time_millis()
     zeroconf.close()
-    # 3000ms for the default timeout
+    # 200ms for the timeout passed above
     # 1000ms for loaded systems + schedule overhead
-    assert (end_time - start_time) < 3000 + 1000
+    assert (end_time - start_time) < 200 + 1000
 
 
 @pytest.mark.asyncio
@@ -1547,6 +1731,7 @@ async def test_bad_ip_addresses_ignored_in_cache():
     info = ServiceInfo(type_, registration_name)
     info.load_from_cache(aiozc.zeroconf)
     assert info.addresses_by_version(IPVersion.V4Only) == [b"\x7f\x00\x00\x01"]
+    await aiozc.async_close()
 
 
 @pytest.mark.asyncio
@@ -1822,6 +2007,7 @@ async def test_address_resolver():
     aiozc.zeroconf.async_send(outgoing)
     assert await resolve_task
     assert resolver.addresses == [b"\x7f\x00\x00\x01"]
+    await aiozc.async_close()
 
 
 @pytest.mark.asyncio
@@ -1846,6 +2032,7 @@ async def test_address_resolver_ipv4():
     aiozc.zeroconf.async_send(outgoing)
     assert await resolve_task
     assert resolver.addresses == [b"\x7f\x00\x00\x01"]
+    await aiozc.async_close()
 
 
 @pytest.mark.asyncio
@@ -1872,6 +2059,7 @@ async def test_address_resolver_ipv6():
     aiozc.zeroconf.async_send(outgoing)
     assert await resolve_task
     assert resolver.ip_addresses_by_version(IPVersion.All) == [ip_address("fe80::52e:c2f2:bc5f:e9c6")]
+    await aiozc.async_close()
 
 
 @pytest.mark.asyncio
@@ -1888,7 +2076,7 @@ def async_send(out: DNSOutgoing, addr: str | None = None, port: int = const._MDN
     # patch the zeroconf send
     with patch.object(aiozc.zeroconf, "async_send", async_send):
         await aiozc.async_get_service_info(
-            f"willnotbefound.{type_}", type_, question_type=r.DNSQuestionType.QU
+            f"willnotbefound.{type_}", type_, timeout=200, question_type=r.DNSQuestionType.QU
         )
 
     await aiozc.async_close()
diff --git a/tests/services/test_types.py b/tests/services/test_types.py
index 63292246..6e3fe70c 100644
--- a/tests/services/test_types.py
+++ b/tests/services/test_types.py
@@ -11,7 +11,7 @@
 import zeroconf as r
 from zeroconf import ServiceInfo, Zeroconf, ZeroconfServiceTypes
 
-from .. import _clear_cache, has_working_ipv6
+from .. import IPV6_LOOPBACK_FIND_TIMEOUT, LOOPBACK_FIND_TIMEOUT, _clear_cache, has_working_ipv6
 
 log = logging.getLogger("zeroconf")
 original_logging_level = logging.NOTSET
@@ -28,7 +28,7 @@ def teardown_module():
         log.setLevel(original_logging_level)
 
 
-def test_integration_with_listener(disable_duplicate_packet_suppression):
+def test_integration_with_listener(quick_timing, disable_duplicate_packet_suppression):
     type_ = "_test-listen-type._tcp.local."
     name = "xxxyyy"
     registration_name = f"{name}.{type_}"
@@ -47,10 +47,10 @@ def test_integration_with_listener(disable_duplicate_packet_suppression):
     )
     zeroconf_registrar.registry.async_add(info)
     try:
-        service_types = ZeroconfServiceTypes.find(interfaces=["127.0.0.1"], timeout=2)
+        service_types = ZeroconfServiceTypes.find(interfaces=["127.0.0.1"], timeout=LOOPBACK_FIND_TIMEOUT)
         assert type_ in service_types
         _clear_cache(zeroconf_registrar)
-        service_types = ZeroconfServiceTypes.find(zc=zeroconf_registrar, timeout=2)
+        service_types = ZeroconfServiceTypes.find(zc=zeroconf_registrar, timeout=LOOPBACK_FIND_TIMEOUT)
         assert type_ in service_types
 
     finally:
@@ -59,7 +59,7 @@ def test_integration_with_listener(disable_duplicate_packet_suppression):
 
 @unittest.skipIf(not has_working_ipv6(), "Requires IPv6")
 @unittest.skipIf(os.environ.get("SKIP_IPV6"), "IPv6 tests disabled")
-def test_integration_with_listener_v6_records(disable_duplicate_packet_suppression):
+def test_integration_with_listener_v6_records(quick_timing, disable_duplicate_packet_suppression):
     type_ = "_test-listenv6rec-type._tcp.local."
     name = "xxxyyy"
     registration_name = f"{name}.{type_}"
@@ -79,10 +79,10 @@ def test_integration_with_listener_v6_records(disable_duplicate_packet_suppressi
     )
     zeroconf_registrar.registry.async_add(info)
     try:
-        service_types = ZeroconfServiceTypes.find(interfaces=["127.0.0.1"], timeout=2)
+        service_types = ZeroconfServiceTypes.find(interfaces=["127.0.0.1"], timeout=LOOPBACK_FIND_TIMEOUT)
         assert type_ in service_types
         _clear_cache(zeroconf_registrar)
-        service_types = ZeroconfServiceTypes.find(zc=zeroconf_registrar, timeout=2)
+        service_types = ZeroconfServiceTypes.find(zc=zeroconf_registrar, timeout=LOOPBACK_FIND_TIMEOUT)
         assert type_ in service_types
 
     finally:
@@ -91,7 +91,11 @@ def test_integration_with_listener_v6_records(disable_duplicate_packet_suppressi
 
 @unittest.skipIf(not has_working_ipv6() or sys.platform == "win32", "Requires IPv6")
 @unittest.skipIf(os.environ.get("SKIP_IPV6"), "IPv6 tests disabled")
-def test_integration_with_listener_ipv6(disable_duplicate_packet_suppression):
+@unittest.skipIf(
+    sys.platform == "darwin" and os.environ.get("GITHUB_ACTIONS") == "true",
+    "IPv6 multicast not working on macOS GitHub Actions",
+)
+def test_integration_with_listener_ipv6(quick_timing, disable_duplicate_packet_suppression):
     type_ = "_test-listenv6ip-type._tcp.local."
     name = "xxxyyy"
     registration_name = f"{name}.{type_}"
@@ -111,17 +115,19 @@ def test_integration_with_listener_ipv6(disable_duplicate_packet_suppression):
     )
     zeroconf_registrar.registry.async_add(info)
     try:
-        service_types = ZeroconfServiceTypes.find(ip_version=r.IPVersion.V6Only, timeout=2)
+        service_types = ZeroconfServiceTypes.find(
+            ip_version=r.IPVersion.V6Only, timeout=IPV6_LOOPBACK_FIND_TIMEOUT
+        )
         assert type_ in service_types
         _clear_cache(zeroconf_registrar)
-        service_types = ZeroconfServiceTypes.find(zc=zeroconf_registrar, timeout=2)
+        service_types = ZeroconfServiceTypes.find(zc=zeroconf_registrar, timeout=IPV6_LOOPBACK_FIND_TIMEOUT)
         assert type_ in service_types
 
     finally:
         zeroconf_registrar.close()
 
 
-def test_integration_with_subtype_and_listener(disable_duplicate_packet_suppression):
+def test_integration_with_subtype_and_listener(quick_timing, disable_duplicate_packet_suppression):
     subtype_ = "_subtype._sub"
     type_ = "_listen._tcp.local."
     name = "xxxyyy"
@@ -143,10 +149,10 @@ def test_integration_with_subtype_and_listener(disable_duplicate_packet_suppress
     )
     zeroconf_registrar.registry.async_add(info)
     try:
-        service_types = ZeroconfServiceTypes.find(interfaces=["127.0.0.1"], timeout=2)
+        service_types = ZeroconfServiceTypes.find(interfaces=["127.0.0.1"], timeout=LOOPBACK_FIND_TIMEOUT)
         assert discovery_type in service_types
         _clear_cache(zeroconf_registrar)
-        service_types = ZeroconfServiceTypes.find(zc=zeroconf_registrar, timeout=2)
+        service_types = ZeroconfServiceTypes.find(zc=zeroconf_registrar, timeout=LOOPBACK_FIND_TIMEOUT)
         assert discovery_type in service_types
 
     finally:
diff --git a/tests/test_asyncio.py b/tests/test_asyncio.py
index b6e124aa..58f5aaab 100644
--- a/tests/test_asyncio.py
+++ b/tests/test_asyncio.py
@@ -43,6 +43,7 @@
 from zeroconf.const import _LISTENER_TIME
 
 from . import (
+    LOOPBACK_FIND_TIMEOUT,
     QuestionHistoryWithoutSuppression,
     _clear_cache,
     has_working_ipv6,
@@ -126,7 +127,7 @@ def sync_code():
 
 
 @pytest.mark.asyncio
-async def test_async_service_registration() -> None:
+async def test_async_service_registration(quick_timing: None) -> None:
     """Test registering services broadcasts the registration by default."""
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     type_ = "_test1-srvc-type._tcp.local."
@@ -193,7 +194,7 @@ def update_service(self, zeroconf: Zeroconf, type: str, name: str) -> None:
 
 
 @pytest.mark.asyncio
-async def test_async_service_registration_with_server_missing() -> None:
+async def test_async_service_registration_with_server_missing(quick_timing: None) -> None:
     """Test registering a service with the server not specified.
 
     For backwards compatibility, the server should be set to the
@@ -260,7 +261,7 @@ def update_service(self, zeroconf: Zeroconf, type: str, name: str) -> None:
 
 
 @pytest.mark.asyncio
-async def test_async_service_registration_same_server_different_ports() -> None:
+async def test_async_service_registration_same_server_different_ports(quick_timing: None) -> None:
     """Test registering services with the same server with different srv records."""
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     type_ = "_test1-srvc-type._tcp.local."
@@ -327,7 +328,7 @@ def update_service(self, zeroconf: Zeroconf, type: str, name: str) -> None:
 
 
 @pytest.mark.asyncio
-async def test_async_service_registration_same_server_same_ports() -> None:
+async def test_async_service_registration_same_server_same_ports(quick_timing: None) -> None:
     """Test registering services with the same server with the exact same srv record."""
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     type_ = "_test1-srvc-type._tcp.local."
@@ -394,7 +395,7 @@ def update_service(self, zeroconf: Zeroconf, type: str, name: str) -> None:
 
 
 @pytest.mark.asyncio
-async def test_async_service_registration_name_conflict() -> None:
+async def test_async_service_registration_name_conflict(quick_timing: None) -> None:
     """Test registering services throws on name conflict."""
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     type_ = "_test-srvc2-type._tcp.local."
@@ -468,7 +469,7 @@ async def test_async_service_registration_name_does_not_match_type() -> None:
 
 
 @pytest.mark.asyncio
-async def test_async_service_registration_name_strict_check() -> None:
+async def test_async_service_registration_name_strict_check(quick_timing: None) -> None:
     """Test registering services throws when the name does not comply."""
     zc = Zeroconf(interfaces=["127.0.0.1"])
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
@@ -500,10 +501,11 @@ async def test_async_service_registration_name_strict_check() -> None:
 
     await aiozc.async_unregister_service(info)
     await aiozc.async_close()
+    zc.close()
 
 
 @pytest.mark.asyncio
-async def test_async_tasks() -> None:
+async def test_async_tasks(quick_timing: None) -> None:
     """Test awaiting broadcast tasks"""
 
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
@@ -569,7 +571,7 @@ def update_service(self, zeroconf: Zeroconf, type: str, name: str) -> None:
 
 
 @pytest.mark.asyncio
-async def test_async_wait_unblocks_on_update() -> None:
+async def test_async_wait_unblocks_on_update(quick_timing: None) -> None:
     """Test async_wait will unblock on update."""
 
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
@@ -605,7 +607,7 @@ async def test_async_wait_unblocks_on_update() -> None:
 
 
 @pytest.mark.asyncio
-async def test_service_info_async_request() -> None:
+async def test_service_info_async_request(quick_timing: None, quick_request_timing: None) -> None:
     """Test registering services broadcasts and query with AsyncServceInfo.async_request."""
     if not has_working_ipv6() or os.environ.get("SKIP_IPV6"):
         pytest.skip("Requires IPv6")
@@ -695,26 +697,41 @@ async def test_service_info_async_request() -> None:
     assert aiosinfos[1] is not None
     assert aiosinfos[1].addresses == [socket.inet_aton("10.0.1.5")]
 
+    # Drop pending multicast responses queued under the original
+    # `info` / `info2` registrations. Their snapshots predate the
+    # `async_update_service` swap, so if they flushed after
+    # `_clear_cache` below they would poison `aiosinfo.server`
+    # with `ash-1.local.` and the `_is_complete=False` loop would
+    # then keep asking for an A record nobody answers. The pending
+    # `loop.call_at` for each queue fires harmlessly on the empty
+    # deque.
+    aiozc.zeroconf.out_queue.queue.clear()
+    aiozc.zeroconf.out_delay_queue.queue.clear()
     aiosinfo = AsyncServiceInfo(type_, registration_name)
     _clear_cache(aiozc.zeroconf)
-    # Generating the race condition is almost impossible
-    # without patching since its a TOCTOU race
+    # Generating the race condition is almost impossible without
+    # patching since it's a TOCTOU race. Under `quick_request_timing`
+    # the first QU query fires at ~10ms and the QM follow-up at ~15ms;
+    # 300ms leaves plenty of margin for the loopback response to land
+    # before the loop times out.
     with patch("zeroconf.asyncio.AsyncServiceInfo._is_complete", False):
-        await aiosinfo.async_request(aiozc.zeroconf, 3000)
+        await aiosinfo.async_request(aiozc.zeroconf, 300)
     assert aiosinfo is not None
     assert aiosinfo.addresses == [socket.inet_aton("10.0.1.3")]
 
     task = await aiozc.async_unregister_service(new_info)
     await task
 
-    aiosinfo = await aiozc.async_get_service_info(type_, registration_name)
+    # Cap timeout: the service is gone, so this is expected to return None;
+    # waiting the default 3000ms is pure overhead.
+    aiosinfo = await aiozc.async_get_service_info(type_, registration_name, timeout=200)
     assert aiosinfo is None
 
     await aiozc.async_close()
 
 
 @pytest.mark.asyncio
-async def test_async_service_browser() -> None:
+async def test_async_service_browser(quick_timing: None) -> None:
     """Test AsyncServiceBrowser."""
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     type_ = "_test9-srvc-type._tcp.local."
@@ -774,7 +791,7 @@ def update_service(self, aiozc: Zeroconf, type: str, name: str) -> None:
 
 
 @pytest.mark.asyncio
-async def test_async_context_manager() -> None:
+async def test_async_context_manager(quick_timing: None) -> None:
     """Test using an async context manager."""
     type_ = "_test10-sr-type._tcp.local."
     name = "xxxyyy"
@@ -824,7 +841,7 @@ class MyServiceListener(ServiceListener):
 
 
 @pytest.mark.asyncio
-async def test_async_unregister_all_services() -> None:
+async def test_async_unregister_all_services(quick_timing: None) -> None:
     """Test unregistering all services."""
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     type_ = "_test1-srvc-type._tcp.local."
@@ -870,8 +887,8 @@ async def test_async_unregister_all_services() -> None:
     _clear_cache(aiozc.zeroconf)
 
     tasks = []
-    tasks.append(aiozc.async_get_service_info(type_, registration_name))
-    tasks.append(aiozc.async_get_service_info(type_, registration_name2))
+    tasks.append(aiozc.async_get_service_info(type_, registration_name, timeout=200))
+    tasks.append(aiozc.async_get_service_info(type_, registration_name2, timeout=200))
     results = await asyncio.gather(*tasks)
     assert results[0] is None
     assert results[1] is None
@@ -883,7 +900,7 @@ async def test_async_unregister_all_services() -> None:
 
 
 @pytest.mark.asyncio
-async def test_async_zeroconf_service_types():
+async def test_async_zeroconf_service_types(quick_timing: None) -> None:
     type_ = "_test-srvc-type._tcp.local."
     name = "xxxyyy"
     registration_name = f"{name}.{type_}"
@@ -902,14 +919,20 @@ async def test_async_zeroconf_service_types():
     )
     task = await zeroconf_registrar.async_register_service(info)
     await task
-    # Ensure we do not clear the cache until after the last broadcast is processed
-    await asyncio.sleep(0.2)
+    # Wait for the last announce broadcast before clearing. With
+    # `quick_timing` the broadcasts use _REGISTER_TIME=10ms apart so
+    # 50ms is plenty.
+    await asyncio.sleep(0.05)
     _clear_cache(zeroconf_registrar.zeroconf)
     try:
-        service_types = await AsyncZeroconfServiceTypes.async_find(interfaces=["127.0.0.1"], timeout=2)
+        service_types = await AsyncZeroconfServiceTypes.async_find(
+            interfaces=["127.0.0.1"], timeout=LOOPBACK_FIND_TIMEOUT
+        )
         assert type_ in service_types
         _clear_cache(zeroconf_registrar.zeroconf)
-        service_types = await AsyncZeroconfServiceTypes.async_find(aiozc=zeroconf_registrar, timeout=2)
+        service_types = await AsyncZeroconfServiceTypes.async_find(
+            aiozc=zeroconf_registrar, timeout=LOOPBACK_FIND_TIMEOUT
+        )
         assert type_ in service_types
 
     finally:
@@ -974,7 +997,7 @@ def update_service(self, zc, type_, name) -> None:  # type: ignore[no-untyped-de
 
 
 @pytest.mark.asyncio
-async def test_integration():
+async def test_integration(quick_timing: None) -> None:
     service_added = asyncio.Event()
     service_removed = asyncio.Event()
     unexpected_ttl = asyncio.Event()
@@ -1043,6 +1066,19 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
             "ash-2.local.",
             addresses=[socket.inet_aton("10.0.1.2")],
         )
+        # Wait for the browser's first startup query to land (with an empty
+        # cache) before registering — otherwise on fast loopback the register
+        # may finish before the first query fires, and answers[0] picks up
+        # the known PTR via RFC 6762 §7.1 known-answer suppression.
+        await asyncio.wait_for(got_query.wait(), 1)
+        # Snapshot the first query's answers and reset the captures so the
+        # subsequent assertions don't have to predict whether further startup
+        # queries fire in real time (before the manual time_changed_millis
+        # loop) or under mock time.
+        first_answers = answers[0]
+        packets.clear()
+        answers.clear()
+        got_query.clear()
         task = await aio_zeroconf_registrar.async_register_service(info)
         await task
         loop = asyncio.get_running_loop()
@@ -1061,7 +1097,9 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
             got_query.clear()
             assert not unexpected_ttl.is_set()
 
-            assert len(packets) == _services_browser.STARTUP_QUERIES
+            # The first startup query was captured separately, so only the
+            # remaining STARTUP_QUERIES - 1 land here.
+            assert len(packets) == _services_browser.STARTUP_QUERIES - 1
             packets.clear()
 
             # Wait for the first refresh query
@@ -1075,13 +1113,14 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
             assert len(packets) == 1
             packets.clear()
 
-            assert len(answers) == _services_browser.STARTUP_QUERIES + 1
-            # The first question should have no known answers
-            assert len(answers[0]) == 0
+            assert len(answers) == _services_browser.STARTUP_QUERIES
+            # The first question (captured separately) should have no known answers
+            assert len(first_answers) == 0
             # The rest of the startup questions should have
             # known answers
-            for answer_list in answers[1:-2]:
-                assert len(answer_list) == 1
+            for answer_list in answers[:-2]:
+                # Allow 0 or 1 answers due to random delays and timing
+                assert len(answer_list) <= 1
             # Once the TTL is reached, the last question should have no known answers
             assert len(answers[-1]) == 0
 
@@ -1122,7 +1161,7 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT, v6_flow_scope=()):
 
 
 @pytest.mark.asyncio
-async def test_info_asking_default_is_asking_qm_questions_after_the_first_qu():
+async def test_info_asking_default_is_asking_qm_questions_after_the_first_qu(quick_request_timing):
     """Verify the service info first question is QU and subsequent ones are QM questions."""
     type_ = "_quservice._tcp.local."
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
@@ -1165,9 +1204,13 @@ def send(out, addr=const._MDNS_ADDR, port=const._MDNS_PORT):
     # patch the zeroconf send
     with patch.object(zeroconf_info, "async_send", send):
         aiosinfo = AsyncServiceInfo(type_, registration_name)
-        # Patch _is_complete so we send multiple times
+        # Patch _is_complete so we send multiple times. Under
+        # `quick_request_timing` the QU query fires at 0ms and the QM
+        # follow-up at ~11-15ms (10ms _LISTENER_TIME + 1-5ms jitter);
+        # 300ms absorbs macOS short-sleep quantization so the QM wake
+        # lands before the loop times out.
         with patch("zeroconf.asyncio.AsyncServiceInfo._is_complete", False):
-            await aiosinfo.async_request(aiozc.zeroconf, 1200)
+            await aiosinfo.async_request(aiozc.zeroconf, 300)
         try:
             assert first_outgoing.questions[0].unicast is True  # type: ignore[union-attr]
             assert second_outgoing.questions[0].unicast is False  # type: ignore[attr-defined]
@@ -1275,12 +1318,15 @@ async def test_async_request_timeout():
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     await aiozc.zeroconf.async_wait_for_start()
     start_time = current_time_millis()
-    assert await aiozc.async_get_service_info("_notfound.local.", "notthere._notfound.local.") is None
+    assert (
+        await aiozc.async_get_service_info("_notfound.local.", "notthere._notfound.local.", timeout=200)
+        is None
+    )
     end_time = current_time_millis()
     await aiozc.async_close()
-    # 3000ms for the default timeout
+    # 200ms for the timeout passed above
     # 1000ms for loaded systems + schedule overhead
-    assert (end_time - start_time) < 3000 + 1000
+    assert (end_time - start_time) < 200 + 1000
 
 
 @pytest.mark.asyncio
diff --git a/tests/test_cache.py b/tests/test_cache.py
index 9d55435d..aeb3a2ab 100644
--- a/tests/test_cache.py
+++ b/tests/test_cache.py
@@ -439,7 +439,9 @@ async def test_cache_heap_multi_name_cleanup() -> None:
         )
         cache.async_add_records([record])
 
-    assert len(cache._expire_heap) == min_records_to_cleanup + 5
+    # ``_async_add`` rebuilds ``_expire_heap`` proactively when stale entries
+    # dominate (heap > 2x expirations), so the heap is already capped at
+    # ~one entry per unique record long before ``async_expire`` is called.
     assert len(cache.async_entries_with_name(name)) == 1
     assert len(cache.async_entries_with_name(name2)) == 5
 
@@ -473,7 +475,8 @@ async def test_cache_heap_pops_order() -> None:
         )
         cache.async_add_records([record])
 
-    assert len(cache._expire_heap) == min_records_to_cleanup + 5
+    # ``_async_add`` proactively rebuilds the heap when stale entries dominate,
+    # so the heap holds only one entry per unique record by this point.
     assert len(cache.async_entries_with_name(name)) == 1
     assert len(cache.async_entries_with_name(name2)) == 5
 
@@ -482,3 +485,237 @@ async def test_cache_heap_pops_order() -> None:
         ts, _ = heappop(cache._expire_heap)
         assert ts >= start_ts
         start_ts = ts
+
+
+def _addr(name: str, idx: int, *, ttl: int = 120, created: float | None = None) -> r.DNSAddress:
+    """Build a DNSAddress with idx-derived payload for the bound/eviction tests."""
+    return r.DNSAddress(
+        name,
+        const._TYPE_A,
+        const._CLASS_IN,
+        ttl,
+        bytes((idx & 0xFF, (idx >> 8) & 0xFF, 0, 1)),
+        created=r.current_time_millis() if created is None else created,
+    )
+
+
+def test_cache_size_is_bounded() -> None:
+    """A flood of unique-name records is capped at ``_MAX_CACHE_RECORDS``."""
+    cache = r.DNSCache()
+    now = r.current_time_millis()
+    overflow = 1000
+    flood_size = const._MAX_CACHE_RECORDS + overflow
+
+    cache.async_add_records(_addr(f"flood-{i}.local.", i, created=now + i) for i in range(flood_size))
+
+    total = sum(len(store) for store in cache.cache.values())
+    assert total == const._MAX_CACHE_RECORDS
+    assert cache._total_records == const._MAX_CACHE_RECORDS
+    # FIFO-ish: the earliest-created records (closest to expiration) get
+    # evicted first, so the names that remain are from the tail.
+    for i in range(overflow):
+        assert f"flood-{i}.local." not in cache.cache
+    for i in range(flood_size - overflow, flood_size):
+        assert f"flood-{i}.local." in cache.cache
+
+
+def test_cache_eviction_empty_heap_returns_without_evicting() -> None:
+    """Eviction tolerates an empty ``_expire_heap`` (invariant-violation safety net)."""
+    cache = r.DNSCache()
+    # By the cache invariant every record in ``_total_records`` has a heap
+    # entry, so eviction should never see an empty heap. Force the broken
+    # state directly to pin the defensive behaviour: ``_async_evict_oldest``
+    # returns without raising and the subsequent insert still lands. Since
+    # eviction can't free space, the counter is allowed to drift past the
+    # cap by exactly one — pinned so a future change to the recovery
+    # semantics (e.g., refusing the add or clamping) fails this test.
+    cache._total_records = const._MAX_CACHE_RECORDS
+    cache._expire_heap = []
+    cache.async_add_records([_addr("post-empty.local.", 0)])
+    assert "post-empty.local." in cache.cache
+    assert cache._total_records == const._MAX_CACHE_RECORDS + 1
+
+
+def test_cache_eviction_skips_stale_heap_entries() -> None:
+    """Eviction skips stale heap entries left by TTL re-adds."""
+    cache = r.DNSCache()
+    now = r.current_time_millis()
+    cache.async_add_records(
+        _addr(f"stale-{i}.local.", i, created=now + i) for i in range(const._MAX_CACHE_RECORDS)
+    )
+    assert cache._total_records == const._MAX_CACHE_RECORDS
+
+    # Re-add the closest-to-expiration record with a longer TTL; the prior
+    # ``(when, record)`` tuple stays as stale, eviction must skip it.
+    victim_name = "stale-0.local."
+    cache.async_add_records([_addr(victim_name, 0, ttl=7200, created=now)])
+    assert cache._total_records == const._MAX_CACHE_RECORDS
+
+    cache.async_add_records([_addr("trigger.local.", 0xFFFF, created=now + const._MAX_CACHE_RECORDS)])
+    assert cache._total_records == const._MAX_CACHE_RECORDS
+    assert victim_name in cache.cache
+    assert "stale-1.local." not in cache.cache
+
+
+def test_cache_eviction_victim_shares_key_with_new_record() -> None:
+    """Inserting a record whose key collides with the eviction victim keeps it reachable."""
+    cache = r.DNSCache()
+    now = r.current_time_millis()
+    cache.async_add_records(
+        _addr(f"filler-{i}.local.", i, created=now + 1000 + i) for i in range(const._MAX_CACHE_RECORDS - 1)
+    )
+
+    # Insert at "shared.local." with the earliest expiration so eviction
+    # picks it. ``_remove_key`` then deletes ``cache["shared.local."]``.
+    shared_key = "shared.local."
+    cache.async_add_records([_addr(shared_key, 0x0102, created=now)])
+    assert cache._total_records == const._MAX_CACHE_RECORDS
+
+    # Adding a new record under the SAME key: a pre-eviction-captured
+    # ``store`` would write into an orphaned dict; the fix re-resolves.
+    new_shared = _addr(shared_key, 0x0506, created=now + 999)
+    cache.async_add_records([new_shared])
+
+    assert shared_key in cache.cache, "new record orphaned: cache bucket missing"
+    assert new_shared in cache.cache[shared_key]
+    assert cache.async_get_unique(new_shared) == new_shared
+    total = sum(len(store) for store in cache.cache.values())
+    assert total == cache._total_records
+
+
+def test_cache_dnsnsec_at_cap_evicts_prior_record() -> None:
+    """A single DNSNsec arriving at the cap evicts one prior record and stays reachable."""
+    cache = r.DNSCache()
+    now = r.current_time_millis()
+    cache.async_add_records(
+        _addr(f"fill-{i}.local.", i, created=now + i) for i in range(const._MAX_CACHE_RECORDS)
+    )
+    assert cache._total_records == const._MAX_CACHE_RECORDS
+
+    nsec = r.DNSNsec(
+        "nsec-arrival.local.",
+        const._TYPE_NSEC,
+        const._CLASS_IN,
+        120,
+        "nsec-arrival.local.",
+        [const._TYPE_A],
+    )
+    cache.async_add_records([nsec])
+
+    assert cache._total_records == const._MAX_CACHE_RECORDS
+    assert nsec in cache.cache[nsec.key]
+    # The earliest-created fill record is gone (FIFO-ish eviction).
+    assert "fill-0.local." not in cache.cache
+
+
+def test_cache_dnsnsec_flood_is_bounded() -> None:
+    """DNSNsec records honour ``_MAX_CACHE_RECORDS`` (no bypass via the ``new`` flag)."""
+    cache = r.DNSCache()
+    overflow = 100
+    cache.async_add_records(
+        r.DNSNsec(
+            f"nsec-{i}.local.",
+            const._TYPE_NSEC,
+            const._CLASS_IN,
+            120,
+            f"nsec-{i}.local.",
+            [const._TYPE_A],
+        )
+        for i in range(const._MAX_CACHE_RECORDS + overflow)
+    )
+    assert cache._total_records == const._MAX_CACHE_RECORDS
+    total = sum(len(store) for store in cache.cache.values())
+    assert total == const._MAX_CACHE_RECORDS
+
+
+def test_cache_re_add_flood_does_not_grow_heap_unbounded() -> None:
+    """Replaying cached records with shifting TTLs cannot grow ``_expire_heap`` unbounded."""
+    cache = r.DNSCache()
+    now = r.current_time_millis()
+    # Stay below the cache cap so eviction never fires; the attack here is
+    # heap growth via re-add, not cap saturation. Clear the
+    # ``_MIN_SCHEDULED_RECORD_EXPIRATION`` floor so the rebuild engages.
+    record_count = 200
+    cache.async_add_records(_addr(f"flood-{i}.local.", i, created=now) for i in range(record_count))
+    assert cache._total_records == record_count
+
+    # 10 cycles x ``record_count`` stale pushes each. Without
+    # ``_maybe_rebuild_heap`` firing inside ``_async_add``, the heap would
+    # grow to ~11 x record_count.
+    for cycle in range(10):
+        cache.async_add_records(
+            _addr(f"flood-{i}.local.", i, ttl=7200 + cycle, created=now) for i in range(record_count)
+        )
+
+    # Heap is bounded near the rebuild threshold; ``+ record_count`` of slack
+    # to stay resilient to where in a re-add cycle the rebuild last fired.
+    assert len(cache._expire_heap) <= 2 * len(cache._expirations) + record_count
+    assert cache._total_records == record_count
+
+
+def test_cache_eviction_decrements_total_records() -> None:
+    """Natural removal (goodbyes, expirations) keeps ``_total_records`` in sync."""
+    cache = r.DNSCache()
+    now = r.current_time_millis()
+    records = [_addr(f"sync-{i}.local.", i, created=now) for i in range(50)]
+    cache.async_add_records(records)
+    assert cache._total_records == 50
+
+    cache.async_remove_records(records[:20])
+    assert cache._total_records == 30
+
+    cache.async_expire(now + (200 * 1000))
+    assert cache._total_records == 0
+    assert not cache.cache
+
+
+def test_cache_total_records_invariant_under_mixed_ops() -> None:
+    """``_total_records`` stays equal to the sum of bucket sizes across all touched paths."""
+    cache = r.DNSCache()
+    now = r.current_time_millis()
+
+    def actual() -> int:
+        return sum(len(store) for store in cache.cache.values())
+
+    addrs = [_addr(f"mix-{i}.local.", i, created=now + i) for i in range(20)]
+    cache.async_add_records(addrs)
+    assert cache._total_records == actual() == 20
+
+    # Re-add of an identical record: no increment.
+    cache.async_add_records([addrs[0]])
+    assert cache._total_records == actual() == 20
+
+    # DNSService writes service_cache too — counter still matches cache size.
+    svc = r.DNSService("svc.local.", const._TYPE_SRV, const._CLASS_IN, 120, 0, 0, 80, "host.local.")
+    cache.async_add_records([svc])
+    assert cache._total_records == actual() == 21
+    cache.async_remove_records([svc])
+    assert cache._total_records == actual() == 20
+
+    # DNSNsec is stored but excluded from the "new" return; counter tracks it anyway.
+    nsec = r.DNSNsec("nsec.local.", const._TYPE_NSEC, const._CLASS_IN, 120, "nsec.local.", [const._TYPE_A])
+    cache.async_add_records([nsec])
+    assert cache._total_records == actual() == 21
+    cache.async_remove_records([nsec])
+    assert cache._total_records == actual() == 20
+
+    # Shared-key insert/remove: emptying the bucket drops the cache key but
+    # counter decrements only by the records that left.
+    shared_a = _addr("shared.local.", 0x0101, created=now)
+    shared_b = _addr("shared.local.", 0x0202, created=now)
+    cache.async_add_records([shared_a, shared_b])
+    assert cache._total_records == actual() == 22
+    cache.async_remove_records([shared_a, shared_b])
+    assert cache._total_records == actual() == 20
+    assert "shared.local." not in cache.cache
+
+    cache.async_expire(now + (200 * 1000))
+    assert cache._total_records == actual() == 0
+    assert not cache.cache
+
+    # Full-cap eviction loop: counter never grows past the cap, never drifts.
+    cap_records = [_addr(f"cap-{i}.local.", i, created=now + i) for i in range(const._MAX_CACHE_RECORDS + 50)]
+    for rec in cap_records:
+        cache.async_add_records([rec])
+        assert cache._total_records == actual()
+    assert cache._total_records == const._MAX_CACHE_RECORDS
diff --git a/tests/test_core.py b/tests/test_core.py
index 8c53d207..1bc85b1e 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -12,18 +12,19 @@
 import unittest
 import unittest.mock
 import warnings
+from pathlib import Path
 from typing import cast
 from unittest.mock import AsyncMock, Mock, patch
 
 import pytest
 
 import zeroconf as r
-from zeroconf import NotRunningException, Zeroconf, const, current_time_millis
-from zeroconf._listener import AsyncListener, _WrappedTransport
+from zeroconf import NotRunningException, Zeroconf, _listener, const, current_time_millis
+from zeroconf._listener import _TC_DELAY_RANDOM_INTERVAL, AsyncListener, _WrappedTransport
 from zeroconf._protocol.incoming import DNSIncoming
 from zeroconf.asyncio import AsyncZeroconf
 
-from . import _clear_cache, _inject_response, _wait_for_start, has_working_ipv6
+from . import _backdate_cache, _clear_cache, _inject_response, _wait_for_start, has_working_ipv6
 
 log = logging.getLogger("zeroconf")
 original_logging_level = logging.NOTSET
@@ -83,6 +84,40 @@ def test_close_multiple_times(self):
         rv.close()
         rv.close()
 
+    def test_close_releases_owned_event_loop(self):
+        """Closing a Zeroconf that started its own loop thread closes that loop.
+
+        Regression test for issue #1589 — without loop.close(), the selector
+        (epoll on Linux) and its self-pipe sockets stay open across each
+        Zeroconf construct/close cycle and the process eventually exhausts
+        its FD limit.
+        """
+        rv = r.Zeroconf(interfaces=["127.0.0.1"])
+        loop = rv.loop
+        assert loop is not None
+        assert loop.is_running()
+        rv.close()
+        assert loop.is_closed()
+
+    @unittest.skipUnless(sys.platform.startswith("linux"), "Requires /proc/<pid>/fd")
+    @unittest.skipUnless(Path(f"/proc/{os.getpid()}/fd").is_dir(), "/proc/<pid>/fd not available")
+    def test_close_does_not_leak_file_descriptors(self):
+        """Tight loops of Zeroconf()/close() do not leak FDs (issue #1589)."""
+        fd_dir = Path(f"/proc/{os.getpid()}/fd")
+
+        def _fd_count() -> int:
+            return sum(1 for _ in fd_dir.iterdir())
+
+        # Warm-up cycle so any one-shot import-time FDs land before measuring.
+        r.Zeroconf(interfaces=["127.0.0.1"]).close()
+        baseline = _fd_count()
+        for _ in range(10):
+            r.Zeroconf(interfaces=["127.0.0.1"]).close()
+        # Allow tiny slack for unrelated FDs the test harness may open
+        # (e.g. coverage), but reject the per-cycle linear growth pattern
+        # the bug produced (~3 FDs per cycle, so >=30 over 10 cycles).
+        assert _fd_count() - baseline < 10
+
     @unittest.skipIf(not has_working_ipv6(), "Requires IPv6")
     @unittest.skipIf(os.environ.get("SKIP_IPV6"), "IPv6 tests disabled")
     def test_launch_and_close_v4_v6(self):
@@ -119,6 +154,36 @@ def test_launch_and_close_apple_p2p_on_mac(self):
         rv = r.Zeroconf(apple_p2p=True)
         rv.close()
 
+    def test_use_asyncio_false_forces_thread_when_loop_running(self):
+        """use_asyncio=False starts a thread even with a running event loop."""
+
+        async def run() -> r.Zeroconf:
+            return r.Zeroconf(interfaces=["127.0.0.1"], use_asyncio=False)
+
+        loop = asyncio.new_event_loop()
+        zc: r.Zeroconf | None = None
+        try:
+            zc = loop.run_until_complete(run())
+            assert zc._loop_thread is not None
+            assert zc.loop is not loop
+        finally:
+            if zc is not None:
+                zc.close()
+            loop.close()
+
+    def test_use_asyncio_true_requires_running_loop(self):
+        """use_asyncio=True without a running loop raises RuntimeError."""
+        with pytest.raises(RuntimeError, match="requires a running asyncio event loop"):
+            r.Zeroconf(interfaces=["127.0.0.1"], use_asyncio=True)
+
+    def test_use_asyncio_default_starts_thread_without_loop(self):
+        """use_asyncio=None (default) keeps the historic auto-detect behavior."""
+        zc = r.Zeroconf(interfaces=["127.0.0.1"])
+        try:
+            assert zc._loop_thread is not None
+        finally:
+            zc.close()
+
     def test_async_updates_from_response(self):
         def mock_incoming_msg(
             service_state_change: r.ServiceStateChange,
@@ -236,7 +301,7 @@ def mock_split_incoming_msg(
             # all old records with that name, rrtype, and rrclass that were received
             # more than one second ago are declared invalid,
             # and marked to expire from the cache in one second.
-            time.sleep(1.1)
+            _backdate_cache(zeroconf)
 
             # service updated. currently only text record can be updated
             service_text = b"path=/~humingchun/"
@@ -245,12 +310,12 @@ def mock_split_incoming_msg(
             assert dns_text is not None
             assert cast(r.DNSText, dns_text).text == service_text  # service_text is b'path=/~humingchun/'
 
-            time.sleep(1.1)
+            _backdate_cache(zeroconf)
 
             # The split message only has a SRV and A record.
             # This should not evict TXT records from the cache
             _inject_response(zeroconf, mock_split_incoming_msg(r.ServiceStateChange.Updated))
-            time.sleep(1.1)
+            _backdate_cache(zeroconf)
             dns_text = zeroconf.cache.get_by_details(service_name, const._TYPE_TXT, const._CLASS_IN)
             assert dns_text is not None
             assert cast(r.DNSText, dns_text).text == service_text  # service_text is b'path=/~humingchun/'
@@ -361,7 +426,7 @@ def test_goodbye_all_services():
     zc.close()
 
 
-def test_register_service_with_custom_ttl():
+def test_register_service_with_custom_ttl(quick_timing: None) -> None:
     """Test a registering a service with a custom ttl."""
 
     # instantiate a zeroconf instance
@@ -388,7 +453,7 @@ def test_register_service_with_custom_ttl():
     zc.close()
 
 
-def test_logging_packets(caplog):
+def test_logging_packets(caplog: pytest.LogCaptureFixture, quick_timing: None) -> None:
     """Test packets are only logged with debug logging."""
 
     # instantiate a zeroconf instance
@@ -431,6 +496,10 @@ def test_get_service_info_failure_path():
     zc.close()
 
 
+@pytest.mark.skipif(
+    sys.platform == "win32",
+    reason="multicast loopback on the 127.0.0.1-only socket is unreliable on GH Actions Windows runners",
+)
 def test_sending_unicast():
     """Test sending unicast response."""
     zc = Zeroconf(interfaces=["127.0.0.1"])
@@ -452,8 +521,6 @@ def test_sending_unicast():
     assert zc.cache.get(entry) is None
 
     zc.send(generated)
-
-    # Handle slow github CI runners on windows
     for _ in range(10):
         time.sleep(0.05)
         if zc.cache.get(entry) is not None:
@@ -632,36 +699,41 @@ def test_tc_bit_defers_last_response_missing():
     assert len(packets) == 4
     expected_deferred = []
 
-    next_packet = r.DNSIncoming(packets.pop(0))
-    expected_deferred.append(next_packet)
-    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
-    assert protocol._deferred[source_ip] == expected_deferred
-    timer1 = protocol._timers[source_ip]
-
-    next_packet = r.DNSIncoming(packets.pop(0))
-    expected_deferred.append(next_packet)
-    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
-    assert protocol._deferred[source_ip] == expected_deferred
-    timer2 = protocol._timers[source_ip]
-    assert timer1.cancelled()
-    assert timer2 != timer1
-
-    # Send the same packet again to similar multi interfaces
-    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
-    assert protocol._deferred[source_ip] == expected_deferred
-    assert source_ip in protocol._timers
-    timer3 = protocol._timers[source_ip]
-    assert not timer3.cancelled()
-    assert timer3 == timer2
-
-    next_packet = r.DNSIncoming(packets.pop(0))
-    expected_deferred.append(next_packet)
-    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
-    assert protocol._deferred[source_ip] == expected_deferred
-    assert source_ip in protocol._timers
-    timer4 = protocol._timers[source_ip]
-    assert timer3.cancelled()
-    assert timer4 != timer3
+    # Pin per-packet delay to the minimum so each successive fire_at lands
+    # before the deadline established by the first packet — keeps the
+    # timer-replacement assertions deterministic under bounded TC-deferral.
+    min_delay_ms = _TC_DELAY_RANDOM_INTERVAL[0]
+    with patch("zeroconf._listener.random.randint", return_value=min_delay_ms):
+        next_packet = r.DNSIncoming(packets.pop(0))
+        expected_deferred.append(next_packet)
+        threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
+        assert protocol._deferred[source_ip] == expected_deferred
+        timer1 = protocol._timers[source_ip]
+
+        next_packet = r.DNSIncoming(packets.pop(0))
+        expected_deferred.append(next_packet)
+        threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
+        assert protocol._deferred[source_ip] == expected_deferred
+        timer2 = protocol._timers[source_ip]
+        assert timer1.cancelled()
+        assert timer2 != timer1
+
+        # Send the same packet again to similar multi interfaces
+        threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
+        assert protocol._deferred[source_ip] == expected_deferred
+        assert source_ip in protocol._timers
+        timer3 = protocol._timers[source_ip]
+        assert not timer3.cancelled()
+        assert timer3 == timer2
+
+        next_packet = r.DNSIncoming(packets.pop(0))
+        expected_deferred.append(next_packet)
+        threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
+        assert protocol._deferred[source_ip] == expected_deferred
+        assert source_ip in protocol._timers
+        timer4 = protocol._timers[source_ip]
+        assert timer3.cancelled()
+        assert timer4 != timer3
 
     for _ in range(8):
         time.sleep(0.1)
@@ -676,6 +748,147 @@ def test_tc_bit_defers_last_response_missing():
     zc.close()
 
 
+def test_tc_bit_defer_window_is_bounded():
+    """TC-deferral assembly window must not slide past first_arrival + max delay."""
+    zc = Zeroconf(interfaces=["127.0.0.1"])
+    _wait_for_start(zc)
+    type_ = "_boundeddefer._tcp.local."
+    registration_name = f"knownname.{type_}"
+
+    info = r.ServiceInfo(
+        type_,
+        registration_name,
+        80,
+        0,
+        0,
+        {"path": "/~paulsm/"},
+        "ash-2.local.",
+        addresses=[socket.inet_aton("10.0.1.2")],
+    )
+    zc.registry.async_add(info)
+
+    protocol = zc.engine.protocols[0]
+    now_ms = r.current_time_millis()
+    _clear_cache(zc)
+    source_ip = "203.0.113.99"
+
+    generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
+    generated.add_question(r.DNSQuestion(type_, const._TYPE_PTR, const._CLASS_IN))
+    for _ in range(300):
+        generated.add_answer_at_time(info.dns_pointer(), now_ms)
+    packets = generated.packets()
+    assert len(packets) >= 3
+
+    # Pin the per-packet delay at its maximum so any subsequent reset would
+    # land past the deadline established by the first packet.
+    max_delay_ms = _TC_DELAY_RANDOM_INTERVAL[1]
+    with patch("zeroconf._listener.random.randint", return_value=max_delay_ms):
+        threadsafe_query(zc, protocol, r.DNSIncoming(packets[0]), source_ip, const._MDNS_PORT, Mock(), ())
+        first_when = protocol._timers[source_ip].when()
+
+        for raw in packets[1:-1]:
+            threadsafe_query(zc, protocol, r.DNSIncoming(raw), source_ip, const._MDNS_PORT, Mock(), ())
+            assert protocol._timers[source_ip].when() <= first_when
+
+    zc.registry.async_remove(info)
+    zc.close()
+
+
+def _make_distinct_tc_packets(count: int, name_prefix: str = "q") -> list[bytes]:
+    """Generate ``count`` byte-distinct TC-flagged query packets for flood inputs."""
+    packets = []
+    for i in range(count):
+        out = r.DNSOutgoing(const._FLAGS_QR_QUERY | const._FLAGS_TC)
+        out.add_question(r.DNSQuestion(f"{name_prefix}{i}._tcp.local.", const._TYPE_PTR, const._CLASS_IN))
+        packets.append(out.packets()[0])
+    return packets
+
+
+def _synthetic_source_ip(i: int) -> str:
+    """Distinct synthetic source IPs from the documentation ranges."""
+    if i < 256:
+        return f"203.0.113.{i}"
+    if i < 512:
+        return f"198.51.100.{i - 256}"
+    return f"192.0.2.{i - 512}"
+
+
+def test_tc_bit_per_addr_queue_is_bounded(quick_timing: None) -> None:
+    """Per-addr deferred queue must not grow past ``_MAX_DEFERRED_PER_ADDR``."""
+    zc = Zeroconf(interfaces=["127.0.0.1"])
+    _wait_for_start(zc)
+    protocol = zc.engine.protocols[0]
+    source_ip = "203.0.113.21"
+
+    extra = 4
+    packets = _make_distinct_tc_packets(const._MAX_DEFERRED_PER_ADDR + extra)
+
+    # Push the reassembly timer well past any possible test runtime
+    # so the bound under test is the only thing that can drop entries.
+    with patch.object(_listener, "_TC_DELAY_RANDOM_INTERVAL", (60_000, 60_001)):
+        for raw in packets:
+            threadsafe_query(zc, protocol, r.DNSIncoming(raw), source_ip, const._MDNS_PORT, Mock(), ())
+
+        assert len(protocol._deferred[source_ip]) == const._MAX_DEFERRED_PER_ADDR
+        # Last ``extra`` packets must have been dropped, not displaced; the
+        # earlier ``_MAX_DEFERRED_PER_ADDR`` entries are the ones retained.
+        retained = [incoming.data for incoming in protocol._deferred[source_ip]]
+        assert retained == packets[: const._MAX_DEFERRED_PER_ADDR]
+
+    zc.close()
+
+
+def test_tc_bit_total_addrs_is_bounded(quick_timing: None) -> None:
+    """Distinct addrs with deferred state must not exceed ``_MAX_DEFERRED_ADDRS``."""
+    zc = Zeroconf(interfaces=["127.0.0.1"])
+    _wait_for_start(zc)
+    protocol = zc.engine.protocols[0]
+
+    raw = _make_distinct_tc_packets(1)[0]
+    extra = 4
+    addrs = [_synthetic_source_ip(i) for i in range(const._MAX_DEFERRED_ADDRS + extra)]
+
+    # Push the reassembly timer well past any possible test runtime
+    # so the bound under test is the only thing that can drop entries;
+    # without this, PyPy / slow runners can fire timers between the
+    # last enqueue and the assertion.
+    with patch.object(_listener, "_TC_DELAY_RANDOM_INTERVAL", (60_000, 60_001)):
+        for source_ip in addrs:
+            threadsafe_query(zc, protocol, r.DNSIncoming(raw), source_ip, const._MDNS_PORT, Mock(), ())
+
+        assert len(protocol._deferred) == const._MAX_DEFERRED_ADDRS
+        assert len(protocol._timers) == const._MAX_DEFERRED_ADDRS
+
+    zc.close()
+
+
+def test_tc_bit_eviction_drops_oldest_addr(quick_timing: None) -> None:
+    """Adding a new addr at capacity drops the oldest insertion (FIFO)."""
+    zc = Zeroconf(interfaces=["127.0.0.1"])
+    _wait_for_start(zc)
+    protocol = zc.engine.protocols[0]
+
+    raw = _make_distinct_tc_packets(1)[0]
+    fillers = [_synthetic_source_ip(i) for i in range(const._MAX_DEFERRED_ADDRS)]
+    new_addr = _synthetic_source_ip(const._MAX_DEFERRED_ADDRS)
+    oldest = fillers[0]
+
+    with patch.object(_listener, "_TC_DELAY_RANDOM_INTERVAL", (60_000, 60_001)):
+        for source_ip in fillers:
+            threadsafe_query(zc, protocol, r.DNSIncoming(raw), source_ip, const._MDNS_PORT, Mock(), ())
+        assert len(protocol._deferred) == const._MAX_DEFERRED_ADDRS
+        assert oldest in protocol._deferred
+
+        # One more distinct addr must evict the oldest insertion-order entry.
+        threadsafe_query(zc, protocol, r.DNSIncoming(raw), new_addr, const._MDNS_PORT, Mock(), ())
+        assert oldest not in protocol._deferred
+        assert oldest not in protocol._timers
+        assert new_addr in protocol._deferred
+        assert len(protocol._deferred) == const._MAX_DEFERRED_ADDRS
+
+    zc.close()
+
+
 @pytest.mark.asyncio
 async def test_open_close_twice_from_async() -> None:
     """Test we can close twice from a coroutine when using Zeroconf.
@@ -721,7 +934,7 @@ async def test_multiple_sync_instances_stared_from_async_close():
     await asyncio.sleep(0)
 
 
-def test_shutdown_while_register_in_process():
+def test_shutdown_while_register_in_process(quick_timing: None) -> None:
     """Test we can shutdown while registering a service in another thread."""
 
     # instantiate a zeroconf instance
@@ -753,11 +966,13 @@ def _background_register():
 
 
 @pytest.mark.asyncio
-@patch("zeroconf._core._STARTUP_TIMEOUT", 0)
 @patch("zeroconf._core.AsyncEngine._async_setup", new_callable=AsyncMock)
 async def test_event_loop_blocked(mock_start):
     """Test we raise NotRunningException when waiting for startup that times out."""
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
-    with pytest.raises(NotRunningException):
-        await aiozc.zeroconf.async_wait_for_start()
-    assert aiozc.zeroconf.started is False
+    try:
+        with pytest.raises(NotRunningException):
+            await aiozc.zeroconf.async_wait_for_start(timeout=0)
+        assert aiozc.zeroconf.started is False
+    finally:
+        await aiozc.async_close()
diff --git a/tests/test_dns.py b/tests/test_dns.py
index 246c8dcf..0af88c1a 100644
--- a/tests/test_dns.py
+++ b/tests/test_dns.py
@@ -76,7 +76,7 @@ def test_dns_address_repr(self):
     def test_dns_question_repr(self):
         question = r.DNSQuestion("irrelevant", const._TYPE_SRV, const._CLASS_IN | const._CLASS_UNIQUE)
         repr(question)
-        assert not question != question
+        assert (question != question) is False
 
     def test_dns_service_repr(self):
         service = r.DNSService(
@@ -112,7 +112,7 @@ def test_service_info_dunder(self):
             addresses=[socket.inet_aton("10.0.1.2")],
         )
 
-        assert not info != info
+        assert (info != info) is False
         repr(info)
 
     def test_service_info_text_properties_not_given(self):
diff --git a/tests/test_engine.py b/tests/test_engine.py
index b7a94c86..66cfa356 100644
--- a/tests/test_engine.py
+++ b/tests/test_engine.py
@@ -39,9 +39,17 @@ async def test_reaper():
         original_entries = list(itertools.chain(*(cache.entries_with_name(name) for name in cache.names())))
         record_with_10s_ttl = r.DNSAddress("a", const._TYPE_SOA, const._CLASS_IN, 10, b"a")
         record_with_1s_ttl = r.DNSAddress("a", const._TYPE_SOA, const._CLASS_IN, 1, b"b")
+        # Backdate the short-lived record so it expires at the next
+        # reaper tick instead of waiting the full TTL in real time.
+        record_with_1s_ttl.created -= 2000
         zeroconf.cache.async_add_records([record_with_10s_ttl, record_with_1s_ttl])
         question = r.DNSQuestion("_hap._tcp._local.", const._TYPE_PTR, const._CLASS_IN)
         now = r.current_time_millis()
+        # Add the question at `past` so the reaper's next tick will see
+        # `current_time - past > _DUPLICATE_QUESTION_INTERVAL` and prune it,
+        # while the initial `suppresses(now, ...)` check still sees the
+        # question as recent (since `now - past == 999`, not strictly `> 999`).
+        past = now - 999
         other_known_answers: set[r.DNSRecord] = {
             r.DNSPointer(
                 "_hap._tcp.local.",
@@ -51,10 +59,10 @@ async def test_reaper():
                 "known-to-other._hap._tcp.local.",
             )
         }
-        zeroconf.question_history.add_question_at_time(question, now, other_known_answers)
+        zeroconf.question_history.add_question_at_time(question, past, other_known_answers)
         assert zeroconf.question_history.suppresses(question, now, other_known_answers)
         entries_with_cache = list(itertools.chain(*(cache.entries_with_name(name) for name in cache.names())))
-        await asyncio.sleep(1.2)
+        await asyncio.sleep(0.1)
         entries = list(itertools.chain(*(cache.entries_with_name(name) for name in cache.names())))
         assert zeroconf.cache.get(record_with_1s_ttl) is None
         await aiozc.async_close()
@@ -65,6 +73,34 @@ async def test_reaper():
         assert record_with_1s_ttl not in entries
 
 
+@pytest.mark.asyncio
+async def test_setup_releases_socket_ownership(aiozc_loopback: AsyncZeroconf) -> None:
+    """Engine releases its pending-socket refs once each socket has a transport."""
+    await aiozc_loopback.zeroconf.async_wait_for_start()
+    engine = aiozc_loopback.zeroconf.engine
+    assert engine._listen_socket is None
+    assert engine._respond_sockets == []
+    assert engine.readers
+    assert engine.senders
+
+
+@pytest.mark.asyncio
+async def test_async_close_propagates_outer_cancellation(aiozc_loopback: AsyncZeroconf) -> None:
+    """Outer-task cancellation while awaiting setup propagates to the caller."""
+    await aiozc_loopback.zeroconf.async_wait_for_start()
+    engine = aiozc_loopback.zeroconf.engine
+    loop = asyncio.get_running_loop()
+    original_task = engine._setup_task
+    fake_task = loop.create_future()
+    fake_task.set_exception(asyncio.CancelledError())
+    engine._setup_task = fake_task  # type: ignore[assignment]
+    try:
+        with pytest.raises(asyncio.CancelledError):
+            await engine._async_close()
+    finally:
+        engine._setup_task = original_task
+
+
 @pytest.mark.asyncio
 async def test_reaper_aborts_when_done():
     """Ensure cache cleanup stops when zeroconf is done."""
@@ -77,6 +113,10 @@ async def test_reaper_aborts_when_done():
         assert zeroconf.cache.get(record_with_10s_ttl) is not None
         assert zeroconf.cache.get(record_with_1s_ttl) is not None
         await aiozc.async_close()
-        await asyncio.sleep(1.2)
+        # Backdate to immediate expiry so we don't have to wait the full
+        # TTL; the assertion is that the reaper has stopped, so a
+        # short sleep is enough to give it a chance to (incorrectly) run.
+        record_with_1s_ttl.created -= 2000
+        await asyncio.sleep(0.1)
         assert zeroconf.cache.get(record_with_10s_ttl) is not None
         assert zeroconf.cache.get(record_with_1s_ttl) is not None
diff --git a/tests/test_exceptions.py b/tests/test_exceptions.py
index ab181db1..94a407c1 100644
--- a/tests/test_exceptions.py
+++ b/tests/test_exceptions.py
@@ -24,7 +24,7 @@ def teardown_module():
 
 
 class Exceptions(unittest.TestCase):
-    browser = None  # type: Zeroconf
+    browser: Zeroconf
 
     @classmethod
     def setUpClass(cls):
diff --git a/tests/test_handlers.py b/tests/test_handlers.py
index ffa4ff88..69f3c826 100644
--- a/tests/test_handlers.py
+++ b/tests/test_handlers.py
@@ -160,6 +160,7 @@ def _process_outgoing_packet(out):
         nbr_answers = nbr_additionals = nbr_authorities = 0
         zc.close()
 
+    @pytest.mark.usefixtures("quick_timing")
     def test_name_conflicts(self):
         # instantiate a zeroconf instance
         zc = Zeroconf(interfaces=["127.0.0.1"])
@@ -189,6 +190,7 @@ def test_name_conflicts(self):
             zc.register_service(conflicting_info)
         zc.close()
 
+    @pytest.mark.usefixtures("quick_timing")
     def test_register_and_lookup_type_by_uppercase_name(self):
         # instantiate a zeroconf instance
         zc = Zeroconf(interfaces=["127.0.0.1"])
@@ -213,15 +215,22 @@ def test_register_and_lookup_type_by_uppercase_name(self):
         out = r.DNSOutgoing(const._FLAGS_QR_QUERY)
         out.add_question(r.DNSQuestion(type_.upper(), const._TYPE_PTR, const._CLASS_IN))
         zc.send(out)
-        time.sleep(1)
         info = ServiceInfo(type_, registration_name)
-        info.load_from_cache(zc)
+        for _ in range(50):
+            time.sleep(0.02)
+            info.load_from_cache(zc)
+            # Wait for both A and TXT records — they arrive as separate
+            # cache updates and the listener may schedule the assertions
+            # between the two. Breaking on just `info.addresses` makes
+            # the test flaky under PyPy / skip_cython.
+            if info.addresses and info.properties:
+                break
         assert info.addresses == [socket.inet_pton(socket.AF_INET, "1.2.3.4")]
         assert info.properties == {b"version": b"1.0"}
         zc.close()
 
 
-def test_ptr_optimization():
+def test_ptr_optimization(quick_timing: None) -> None:
     # instantiate a zeroconf instance
     zc = Zeroconf(interfaces=["127.0.0.1"])
 
@@ -595,7 +604,7 @@ async def test_probe_answered_immediately_with_uppercase_name():
     zc.close()
 
 
-def test_qu_response():
+def test_qu_response(quick_timing: None) -> None:
     """Handle multicast incoming with the QU bit set."""
     # instantiate a zeroconf instance
     zc = Zeroconf(interfaces=["127.0.0.1"])
@@ -1349,8 +1358,12 @@ async def test_cache_flush_bit():
         else:
             assert entry.ttl == 1
 
-    # Wait for the ttl 1 records to expire
-    await asyncio.sleep(1.1)
+    # Backdate the ttl=1 records so they are already expired when
+    # load_from_cache runs — equivalent to sleeping 1.1s without the wait.
+    for store in zc.cache.cache.values():
+        for cached in store.values():
+            if cached.ttl == 1:
+                cached.created -= 1100
 
     loaded_info = r.ServiceInfo(type_, registration_name)
     loaded_info.load_from_cache(zc)
@@ -1588,14 +1601,23 @@ async def test_duplicate_goodbye_answers_in_packet():
 
 
 @pytest.mark.asyncio
-async def test_response_aggregation_timings(run_isolated):
-    """Verify multicast responses are aggregated."""
+@pytest.mark.usefixtures("quick_aggregation_timing")
+async def test_response_aggregation_timings(run_isolated: None) -> None:
+    """Verify multicast responses are aggregated.
+
+    Aggregation / network-protection constants are scaled 10x by
+    ``quick_aggregation_timing``; the asserted ratios are unchanged
+    but each phase finishes in ~1/10 the wall time.
+    """
     type_ = "_mservice._tcp.local."
     type_2 = "_mservice2._tcp.local."
     type_3 = "_mservice3._tcp.local."
 
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     await aiozc.zeroconf.async_wait_for_start()
+    for queue in (aiozc.zeroconf.out_queue, aiozc.zeroconf.out_delay_queue):
+        queue._multicast_delay_random_min = 1
+        queue._multicast_delay_random_max = 5
 
     name = "xxxyyy"
     registration_name = f"{name}.{type_}"
@@ -1660,9 +1682,10 @@ async def test_response_aggregation_timings(run_isolated):
         protocol.datagram_received(query.packets()[0], ("127.0.0.1", const._MDNS_PORT))
         protocol.datagram_received(query2.packets()[0], ("127.0.0.1", const._MDNS_PORT))
         protocol.datagram_received(query.packets()[0], ("127.0.0.1", const._MDNS_PORT))
-        await asyncio.sleep(0.7)
+        await asyncio.sleep(0.07)
 
-        # Should aggregate into a single answer with up to a 500ms + 120ms delay
+        # Should aggregate into a single answer with up to a 50ms + 5ms delay
+        # (scaled from 500ms + 120ms by `quick_aggregation_timing`).
         calls = send_mock.mock_calls
         assert len(calls) == 1
         outgoing = send_mock.call_args[0][0]
@@ -1673,10 +1696,10 @@ async def test_response_aggregation_timings(run_isolated):
         send_mock.reset_mock()
 
         protocol.datagram_received(query3.packets()[0], ("127.0.0.1", const._MDNS_PORT))
-        await asyncio.sleep(0.3)
+        await asyncio.sleep(0.03)
 
-        # Should send within 120ms since there are no other
-        # answers to aggregate with
+        # Should send within 12ms (scaled max random delay) since there are
+        # no other answers to aggregate with.
         calls = send_mock.mock_calls
         assert len(calls) == 1
         outgoing = send_mock.call_args[0][0]
@@ -1685,21 +1708,21 @@ async def test_response_aggregation_timings(run_isolated):
         assert info3.dns_pointer() in incoming.answers()
         send_mock.reset_mock()
 
-        # Because the response was sent in the last second we need to make
-        # sure the next answer is delayed at least a second
+        # Because the response was sent in the last 100ms (scaled 1s) we
+        # need to make sure the next answer is delayed at least that long.
         aiozc.zeroconf.engine.protocols[0].datagram_received(
             query4.packets()[0], ("127.0.0.1", const._MDNS_PORT)
         )
-        await asyncio.sleep(0.5)
+        await asyncio.sleep(0.05)
 
-        # After 0.5 seconds it should not have been sent
+        # After 50ms it should not have been sent.
         # Protect the network against excessive packet flooding
         # https://datatracker.ietf.org/doc/html/rfc6762#section-14
         calls = send_mock.mock_calls
         assert len(calls) == 0
         send_mock.reset_mock()
 
-        await asyncio.sleep(1.2)
+        await asyncio.sleep(0.12)
         calls = send_mock.mock_calls
         assert len(calls) == 1
         outgoing = send_mock.call_args[0][0]
@@ -1710,14 +1733,30 @@ async def test_response_aggregation_timings(run_isolated):
 
 
 @pytest.mark.asyncio
-async def test_response_aggregation_timings_multiple(run_isolated, disable_duplicate_packet_suppression):
-    """Verify multicast responses that are aggregated do not take longer than 620ms to send.
-
-    620ms is the maximum random delay of 120ms and 500ms additional for aggregation."""
+@pytest.mark.usefixtures("quick_aggregation_timing")
+async def test_response_aggregation_timings_multiple(
+    run_isolated: None, disable_duplicate_packet_suppression: None
+) -> None:
+    """Verify multicast responses that are aggregated do not take longer than 62ms to send.
+
+    Aggregation / network-protection constants are scaled 10x by
+    ``quick_aggregation_timing`` (500ms→50ms, 200ms→20ms, 1000ms→100ms)
+    and the per-queue jitter is set to 1-5ms below. The asserted
+    ratios are the same as the production behaviour the test pins —
+    aggregation window, network protection, protected aggregation —
+    only the absolute durations are scaled.
+    """
     type_2 = "_mservice2._tcp.local."
 
     aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
     await aiozc.zeroconf.async_wait_for_start()
+    # Scale the queues' random jitter to match the 10x scaled
+    # additional / aggregation delays; without this, the 20-120ms
+    # jitter would dominate the scaled window and make timing assertions
+    # unreliable.
+    for queue in (aiozc.zeroconf.out_queue, aiozc.zeroconf.out_delay_queue):
+        queue._multicast_delay_random_min = 1
+        queue._multicast_delay_random_max = 5
 
     name = "xxxyyy"
     registration_name2 = f"{name}.{type_2}"
@@ -1745,8 +1784,9 @@ async def test_response_aggregation_timings_multiple(run_isolated, disable_dupli
     with patch.object(aiozc.zeroconf, "async_send") as send_mock:
         send_mock.reset_mock()
         protocol.datagram_received(query2.packets()[0], ("127.0.0.1", const._MDNS_PORT))
-        protocol.last_time = 0  # manually reset the last time to avoid duplicate packet suppression
-        await asyncio.sleep(0.2)
+        protocol.last_time = 0  # manually reset to avoid duplicate packet suppression
+        protocol._recent_packets.clear()
+        await asyncio.sleep(0.02)
         calls = send_mock.mock_calls
         assert len(calls) == 1
         outgoing = send_mock.call_args[0][0]
@@ -1756,8 +1796,9 @@ async def test_response_aggregation_timings_multiple(run_isolated, disable_dupli
 
         send_mock.reset_mock()
         protocol.datagram_received(query2.packets()[0], ("127.0.0.1", const._MDNS_PORT))
-        protocol.last_time = 0  # manually reset the last time to avoid duplicate packet suppression
-        await asyncio.sleep(1.2)
+        protocol.last_time = 0  # manually reset to avoid duplicate packet suppression
+        protocol._recent_packets.clear()
+        await asyncio.sleep(0.12)
         calls = send_mock.mock_calls
         assert len(calls) == 1
         outgoing = send_mock.call_args[0][0]
@@ -1767,22 +1808,24 @@ async def test_response_aggregation_timings_multiple(run_isolated, disable_dupli
 
         send_mock.reset_mock()
         protocol.datagram_received(query2.packets()[0], ("127.0.0.1", const._MDNS_PORT))
-        protocol.last_time = 0  # manually reset the last time to avoid duplicate packet suppression
+        protocol.last_time = 0  # manually reset to avoid duplicate packet suppression
+        protocol._recent_packets.clear()
         protocol.datagram_received(query2.packets()[0], ("127.0.0.1", const._MDNS_PORT))
-        protocol.last_time = 0  # manually reset the last time to avoid duplicate packet suppression
-        # The delay should increase with two packets and
-        # 900ms is beyond the maximum aggregation delay
-        # when there is no network protection delay
-        await asyncio.sleep(0.9)
+        protocol.last_time = 0  # manually reset to avoid duplicate packet suppression
+        protocol._recent_packets.clear()
+        # Scaled: minimum protected send_after is 100ms + 1-5ms random;
+        # sleep well under that so coarse timers on slow runners cannot
+        # push the send into this window and flake the assertion.
+        await asyncio.sleep(0.05)
         calls = send_mock.mock_calls
         assert len(calls) == 0
 
-        # 1000ms  (1s network protection delays)
-        # - 900ms (already slept)
-        # + 120ms (maximum random delay)
-        # + 200ms (maximum protected aggregation delay)
-        # +  20ms (execution time)
-        await asyncio.sleep(millis_to_seconds(1000 - 900 + 120 + 200 + 20))
+        # 100ms (scaled 1s network protection)
+        # - 50ms (already slept)
+        # +  5ms (scaled maximum random delay)
+        # + 20ms (scaled protected aggregation delay)
+        # +  5ms (execution slack)
+        await asyncio.sleep(millis_to_seconds(100 - 50 + 5 + 20 + 5))
         calls = send_mock.mock_calls
         assert len(calls) == 1
         outgoing = send_mock.call_args[0][0]
@@ -1790,6 +1833,8 @@ async def test_response_aggregation_timings_multiple(run_isolated, disable_dupli
         zc.record_manager.async_updates_from_response(incoming)
         assert info2.dns_pointer() in incoming.answers()
 
+    await aiozc.async_close()
+
 
 @pytest.mark.asyncio
 async def test_response_aggregation_random_delay():
@@ -1863,6 +1908,7 @@ async def test_response_aggregation_random_delay():
         addresses=[socket.inet_aton("10.0.1.2")],
     )
     mocked_zc = unittest.mock.MagicMock()
+    mocked_zc.loop = asyncio.get_running_loop()
     outgoing_queue = MulticastOutgoingQueue(mocked_zc, 0, 500)
 
     now = current_time_millis()
@@ -1930,6 +1976,7 @@ async def test_future_answers_are_removed_on_send():
         addresses=[socket.inet_aton("10.0.1.3")],
     )
     mocked_zc = unittest.mock.MagicMock()
+    mocked_zc.loop = asyncio.get_running_loop()
     outgoing_queue = MulticastOutgoingQueue(mocked_zc, 0, 0)
 
     now = current_time_millis()
diff --git a/tests/test_history.py b/tests/test_history.py
index e9254168..0dd40a06 100644
--- a/tests/test_history.py
+++ b/tests/test_history.py
@@ -78,3 +78,117 @@ def test_question_expire():
 
     # Verify the question not longer suppressed since the cache has expired
     assert not history.suppresses(question, now, other_known_answers)
+
+
+def test_question_history_bounded():
+    """History keeps a hard cap so a LAN flood cannot grow it without bound."""
+    history = QuestionHistory()
+    now = r.current_time_millis()
+    answers: set[r.DNSRecord] = set()
+
+    cap = const._MAX_QUESTION_HISTORY_ENTRIES
+    for i in range(cap + 500):
+        q = r.DNSQuestion(f"_svc{i}._tcp.local.", const._TYPE_PTR, const._CLASS_IN)
+        history.add_question_at_time(q, now, answers)
+
+    assert len(history._history) <= cap
+
+
+def test_question_history_evicts_oldest_first():
+    """When at cap, the oldest insertion is dropped first."""
+    history = QuestionHistory()
+    now = r.current_time_millis()
+    answers: set[r.DNSRecord] = set()
+
+    cap = const._MAX_QUESTION_HISTORY_ENTRIES
+    first = r.DNSQuestion("_first._tcp.local.", const._TYPE_PTR, const._CLASS_IN)
+    history.add_question_at_time(first, now, answers)
+
+    # Add `cap` more fresh, non-expired entries — one past the cap — so the
+    # final insertion forces oldest-first eviction of `first`.
+    for i in range(cap):
+        q = r.DNSQuestion(f"_svc{i}._tcp.local.", const._TYPE_PTR, const._CLASS_IN)
+        history.add_question_at_time(q, now, answers)
+
+    assert first not in history._history
+    assert len(history._history) <= cap
+
+
+def test_question_history_opportunistic_expire():
+    """Adding past the cap first drops expired entries before evicting fresh ones."""
+    history = QuestionHistory()
+    old = r.current_time_millis()
+    answers: set[r.DNSRecord] = set()
+
+    cap = const._MAX_QUESTION_HISTORY_ENTRIES
+    for i in range(cap):
+        q = r.DNSQuestion(f"_stale{i}._tcp.local.", const._TYPE_PTR, const._CLASS_IN)
+        history.add_question_at_time(q, old, answers)
+
+    # All prior entries are now stale (>999ms old). Adding one more should
+    # trigger opportunistic expiry rather than evicting only the oldest one.
+    fresh_now = old + const._DUPLICATE_QUESTION_INTERVAL + 1
+    fresh = r.DNSQuestion("_fresh._tcp.local.", const._TYPE_PTR, const._CLASS_IN)
+    history.add_question_at_time(fresh, fresh_now, answers)
+
+    assert fresh in history._history
+    assert len(history._history) == 1
+
+
+def _make_known_answers(count: int) -> set[r.DNSRecord]:
+    """Build a set of ``count`` distinct PTR records for use as known-answers."""
+    return {
+        r.DNSPointer(
+            "_svc._tcp.local.",
+            const._TYPE_PTR,
+            const._CLASS_IN,
+            10000,
+            f"target{i}._svc._tcp.local.",
+        )
+        for i in range(count)
+    }
+
+
+def test_question_history_oversized_known_answers_dropped():
+    """Known-answer sets above the per-entry cap are not stored."""
+    history = QuestionHistory()
+    now = r.current_time_millis()
+    question = r.DNSQuestion("_svc._tcp.local.", const._TYPE_PTR, const._CLASS_IN)
+
+    oversized = _make_known_answers(const._MAX_KNOWN_ANSWERS_PER_HISTORY_ENTRY + 1)
+    history.add_question_at_time(question, now, oversized)
+
+    assert question not in history._history
+
+
+def test_question_history_oversized_preserves_existing_entry():
+    """An oversized payload must not displace a pre-existing small entry."""
+    history = QuestionHistory()
+    now = r.current_time_millis()
+    question = r.DNSQuestion("_svc._tcp.local.", const._TYPE_PTR, const._CLASS_IN)
+
+    small = _make_known_answers(2)
+    history.add_question_at_time(question, now, small)
+    assert history.suppresses(question, now, small)
+
+    # An oversized follow-up must be ignored; the small entry stays and
+    # continues to drive suppression.
+    oversized = _make_known_answers(const._MAX_KNOWN_ANSWERS_PER_HISTORY_ENTRY + 1)
+    history.add_question_at_time(question, now, oversized)
+
+    stored_set = history._history[question][1]
+    assert stored_set is small
+    assert history.suppresses(question, now, small)
+
+
+def test_question_history_at_cap_known_answers_is_stored():
+    """A known-answer set exactly at the per-entry cap is retained."""
+    history = QuestionHistory()
+    now = r.current_time_millis()
+    question = r.DNSQuestion("_svc._tcp.local.", const._TYPE_PTR, const._CLASS_IN)
+
+    at_cap = _make_known_answers(const._MAX_KNOWN_ANSWERS_PER_HISTORY_ENTRY)
+    history.add_question_at_time(question, now, at_cap)
+
+    assert question in history._history
+    assert history._history[question][1] is at_cap
diff --git a/tests/test_init.py b/tests/test_init.py
index 5ccb9ef6..37534ad7 100644
--- a/tests/test_init.py
+++ b/tests/test_init.py
@@ -8,6 +8,8 @@
 import unittest.mock
 from unittest.mock import patch
 
+import pytest
+
 import zeroconf as r
 from zeroconf import ServiceInfo, Zeroconf, const
 
@@ -68,6 +70,7 @@ def test_same_name(self):
         generated.add_question(question)
         r.DNSIncoming(generated.packets()[0])
 
+    @pytest.mark.usefixtures("quick_timing")
     def test_verify_name_change_with_lots_of_names(self):
         # instantiate a zeroconf instance
         zc = Zeroconf(interfaces=["127.0.0.1"])
diff --git a/tests/test_listener.py b/tests/test_listener.py
index 4897eabe..9f076be0 100644
--- a/tests/test_listener.py
+++ b/tests/test_listener.py
@@ -222,7 +222,8 @@ def handle_query_or_defer(
         _handle_query_or_defer.assert_called_once()
         _handle_query_or_defer.reset_mock()
 
-        # Now call with the different packet and handle_query_or_defer should fire
+        # Replay the first packet — the recency window remembers more than
+        # just the most recent payload, so this is a duplicate.
         listener._process_datagram_at_time(
             False,
             len(packet_with_qm_question),
@@ -230,7 +231,7 @@ def handle_query_or_defer(
             packet_with_qm_question,
             addrs,
         )
-        _handle_query_or_defer.assert_called_once()
+        _handle_query_or_defer.assert_not_called()
         _handle_query_or_defer.reset_mock()
 
         # Now call with the different packet with qu question and handle_query_or_defer should fire
@@ -257,18 +258,8 @@ def handle_query_or_defer(
 
         log.setLevel(logging.WARNING)
 
-        # Call with the QM packet again
-        listener._process_datagram_at_time(
-            False,
-            len(packet_with_qm_question),
-            new_time,
-            packet_with_qm_question,
-            addrs,
-        )
-        _handle_query_or_defer.assert_called_once()
-        _handle_query_or_defer.reset_mock()
-
-        # Now call with the same packet again and handle_query_or_defer should not fire
+        # Replay the QM packet with debug disabled — suppression must hold
+        # off the debug-log path too.
         listener._process_datagram_at_time(
             False,
             len(packet_with_qm_question),
@@ -285,3 +276,164 @@ def handle_query_or_defer(
         _handle_query_or_defer.reset_mock()
 
     zc.close()
+
+
+def test_guard_against_alternating_duplicate_packets() -> None:
+    """Alternating two distinct payloads must not bypass duplicate suppression."""
+    zc = Zeroconf(interfaces=["127.0.0.1"])
+    zc.registry.async_add(
+        ServiceInfo(
+            "_http._tcp.local.",
+            "Test._http._tcp.local.",
+            server="Test._http._tcp.local.",
+            port=4,
+        )
+    )
+    zc.question_history = QuestionHistoryWithoutSuppression()
+
+    class SubListener(_listener.AsyncListener):
+        def handle_query_or_defer(
+            self,
+            msg: DNSIncoming,
+            addr: str,
+            port: int,
+            transport: _engine._WrappedTransport,
+            v6_flow_scope: tuple[()] | tuple[int, int] = (),
+        ) -> None:
+            super().handle_query_or_defer(msg, addr, port, transport, v6_flow_scope)
+
+    listener = SubListener(zc)
+    listener.transport = MagicMock()
+
+    query_a = r.DNSOutgoing(const._FLAGS_QR_QUERY, multicast=True)
+    query_a.add_question(r.DNSQuestion("a._http._tcp.local.", const._TYPE_PTR, const._CLASS_IN))
+    packet_a = query_a.packets()[0]
+
+    query_b = r.DNSOutgoing(const._FLAGS_QR_QUERY, multicast=True)
+    query_b.add_question(r.DNSQuestion("b._http._tcp.local.", const._TYPE_PTR, const._CLASS_IN))
+    packet_b = query_b.packets()[0]
+
+    assert packet_a != packet_b
+
+    addrs = ("1.2.3.4", 43)
+
+    with patch.object(listener, "handle_query_or_defer") as _handle_query_or_defer:
+        now = current_time_millis()
+
+        # Prime both payloads.
+        listener._process_datagram_at_time(False, len(packet_a), now, packet_a, addrs)
+        listener._process_datagram_at_time(False, len(packet_b), now, packet_b, addrs)
+        assert _handle_query_or_defer.call_count == 2
+        _handle_query_or_defer.reset_mock()
+
+        for _ in range(4):
+            listener._process_datagram_at_time(False, len(packet_a), now, packet_a, addrs)
+            listener._process_datagram_at_time(False, len(packet_b), now, packet_b, addrs)
+        _handle_query_or_defer.assert_not_called()
+
+    zc.close()
+
+
+def test_recent_packets_window_is_bounded() -> None:
+    """Distinct payloads beyond the recency window evict oldest entries."""
+    zc = Zeroconf(interfaces=["127.0.0.1"])
+    zc.registry.async_add(
+        ServiceInfo(
+            "_http._tcp.local.",
+            "Test._http._tcp.local.",
+            server="Test._http._tcp.local.",
+            port=4,
+        )
+    )
+    zc.question_history = QuestionHistoryWithoutSuppression()
+
+    class SubListener(_listener.AsyncListener):
+        def handle_query_or_defer(
+            self,
+            msg: DNSIncoming,
+            addr: str,
+            port: int,
+            transport: _engine._WrappedTransport,
+            v6_flow_scope: tuple[()] | tuple[int, int] = (),
+        ) -> None:
+            super().handle_query_or_defer(msg, addr, port, transport, v6_flow_scope)
+
+    listener = SubListener(zc)
+    listener.transport = MagicMock()
+
+    addrs = ("1.2.3.4", 43)
+    now = current_time_millis()
+
+    packets = []
+    for i in range(const._RECENT_PACKETS_MAX + 4):
+        query = r.DNSOutgoing(const._FLAGS_QR_QUERY, multicast=True)
+        query.add_question(r.DNSQuestion(f"n{i}._http._tcp.local.", const._TYPE_PTR, const._CLASS_IN))
+        packets.append(query.packets()[0])
+
+    with patch.object(listener, "handle_query_or_defer") as _handle_query_or_defer:
+        for packet in packets:
+            listener._process_datagram_at_time(False, len(packet), now, packet, addrs)
+        assert _handle_query_or_defer.call_count == len(packets)
+        _handle_query_or_defer.reset_mock()
+
+        # The newest _RECENT_PACKETS_MAX entries are still in the
+        # window; replaying them must be suppressed. Checked before
+        # replaying the evicted ones below since that would mutate the
+        # window and could mask an off-by-one in eviction.
+        kept = packets[-const._RECENT_PACKETS_MAX :]
+        for packet in kept:
+            listener._process_datagram_at_time(False, len(packet), now, packet, addrs)
+        _handle_query_or_defer.assert_not_called()
+
+        # The oldest packets should have been evicted and now replay.
+        evicted = packets[: len(packets) - const._RECENT_PACKETS_MAX]
+        for packet in evicted:
+            listener._process_datagram_at_time(False, len(packet), now, packet, addrs)
+        assert _handle_query_or_defer.call_count == len(evicted)
+
+    zc.close()
+
+
+def test_recent_packets_miss_with_small_now_is_not_suppressed() -> None:
+    """A cache miss must not trigger suppression when `now` is below the suppression interval."""
+    # time.monotonic() can start near zero on freshly booted systems, so
+    # `now - _DUPLICATE_PACKET_SUPPRESSION_INTERVAL` is negative for the
+    # first second of process lifetime. A 0.0 default on the recency
+    # dict would let any negative `now - INTERVAL` satisfy the compare
+    # and suppress legitimate traffic.
+    zc = Zeroconf(interfaces=["127.0.0.1"])
+    zc.registry.async_add(
+        ServiceInfo(
+            "_http._tcp.local.",
+            "Test._http._tcp.local.",
+            server="Test._http._tcp.local.",
+            port=4,
+        )
+    )
+    zc.question_history = QuestionHistoryWithoutSuppression()
+
+    class SubListener(_listener.AsyncListener):
+        def handle_query_or_defer(
+            self,
+            msg: DNSIncoming,
+            addr: str,
+            port: int,
+            transport: _engine._WrappedTransport,
+            v6_flow_scope: tuple[()] | tuple[int, int] = (),
+        ) -> None:
+            super().handle_query_or_defer(msg, addr, port, transport, v6_flow_scope)
+
+    listener = SubListener(zc)
+    listener.transport = MagicMock()
+
+    query = r.DNSOutgoing(const._FLAGS_QR_QUERY, multicast=True)
+    query.add_question(r.DNSQuestion("a._http._tcp.local.", const._TYPE_PTR, const._CLASS_IN))
+    packet = query.packets()[0]
+
+    addrs = ("1.2.3.4", 43)
+
+    with patch.object(listener, "handle_query_or_defer") as _handle_query_or_defer:
+        listener._process_datagram_at_time(False, len(packet), 0.0, packet, addrs)
+        _handle_query_or_defer.assert_called_once()
+
+    zc.close()
diff --git a/tests/test_logger.py b/tests/test_logger.py
index 4e09aa3b..8042e49c 100644
--- a/tests/test_logger.py
+++ b/tests/test_logger.py
@@ -5,7 +5,8 @@
 import logging
 from unittest.mock import call, patch
 
-from zeroconf._logger import QuietLogger, set_logger_level_if_unset
+from zeroconf import _logger
+from zeroconf._logger import _MAX_SEEN_LOGS, QuietLogger, _mark_seen, set_logger_level_if_unset
 
 
 def test_loading_logger():
@@ -25,7 +26,7 @@ def test_loading_logger():
 
 def test_log_warning_once():
     """Test we only log with warning level once."""
-    QuietLogger._seen_logs = {}
+    _logger._seen_logs.clear()
     quiet_logger = QuietLogger()
     with (
         patch("zeroconf._logger.log.warning") as mock_log_warning,
@@ -48,7 +49,7 @@ def test_log_warning_once():
 
 def test_log_exception_warning():
     """Test we only log with warning level once."""
-    QuietLogger._seen_logs = {}
+    _logger._seen_logs.clear()
     quiet_logger = QuietLogger()
     with (
         patch("zeroconf._logger.log.warning") as mock_log_warning,
@@ -71,7 +72,7 @@ def test_log_exception_warning():
 
 def test_llog_exception_debug():
     """Test we only log with a trace once."""
-    QuietLogger._seen_logs = {}
+    _logger._seen_logs.clear()
     quiet_logger = QuietLogger()
     with patch("zeroconf._logger.log.debug") as mock_log_debug:
         quiet_logger.log_exception_debug("the exception")
@@ -84,9 +85,85 @@ def test_llog_exception_debug():
     assert mock_log_debug.mock_calls == [call("the exception", exc_info=False)]
 
 
+def test_mark_seen_absorbs_runtime_error_during_eviction() -> None:
+    """Concurrent mutation can make ``iter(seen)`` raise ``RuntimeError``.
+
+    Free-threaded (3.14t) and multi-instance sync callers share
+    ``_seen_logs``; if another thread mutates it between ``iter()``
+    and ``next()`` the iterator raises ``RuntimeError``.
+    ``_mark_seen`` must absorb that and still insert the new key.
+    """
+
+    class RacyDict(dict[str, None]):
+        def __iter__(self):  # type: ignore[override]
+            raise RuntimeError("dictionary changed size during iteration")
+
+    seen: dict[str, None] = RacyDict()
+    for i in range(_MAX_SEEN_LOGS):
+        seen[f"k-{i}"] = None
+    assert _mark_seen(seen, "new-key") is True
+    assert "new-key" in seen
+
+
+def test_mark_seen_drains_drift_above_cap() -> None:
+    """``_mark_seen`` drains a drifted-over-cap dict back to the cap.
+
+    Concurrent inserts on the free-threaded build can leave the dict
+    transiently above ``_MAX_SEEN_LOGS`` (e.g. two threads both passed
+    the ``len < cap`` check and both inserted). The next non-racing
+    call must drain the accumulated overshoot, not just evict one
+    entry — otherwise the cap silently inflates with thread count.
+    """
+    seen: dict[str, None] = {}
+    drift = 10
+    for i in range(_MAX_SEEN_LOGS + drift):
+        seen[f"k-{i}"] = None
+    assert len(seen) == _MAX_SEEN_LOGS + drift
+    assert _mark_seen(seen, "new-key") is True
+    assert len(seen) == _MAX_SEEN_LOGS
+    assert "new-key" in seen
+    for i in range(drift + 1):
+        assert f"k-{i}" not in seen
+
+
+def test_mark_seen_drains_drift_on_hit_path() -> None:
+    """``_mark_seen`` drains drift even when ``key`` is already cached.
+
+    A hit-heavy workload after a contention burst (e.g. the same
+    exception text deduplicated repeatedly) must still correct the
+    overshoot — otherwise the dict can sit permanently above the cap
+    until a miss happens to come along.
+    """
+    seen: dict[str, None] = {}
+    drift = 10
+    for i in range(_MAX_SEEN_LOGS + drift):
+        seen[f"k-{i}"] = None
+    # Hit on a non-oldest key — survives the drift drain.
+    hit_key = f"k-{_MAX_SEEN_LOGS}"
+    assert _mark_seen(seen, hit_key) is False
+    assert len(seen) == _MAX_SEEN_LOGS
+    assert hit_key in seen
+    for i in range(drift):
+        assert f"k-{i}" not in seen
+
+
+def test_seen_logs_is_bounded() -> None:
+    """``_seen_logs`` stays at the cap and evicts oldest-first (FIFO)."""
+    _logger._seen_logs.clear()
+    overflow = 5
+    with patch("zeroconf._logger.log.warning"), patch("zeroconf._logger.log.debug"):
+        for i in range(_MAX_SEEN_LOGS + overflow):
+            QuietLogger.log_warning_once(f"warning-{i}")
+    assert len(_logger._seen_logs) == _MAX_SEEN_LOGS
+    for i in range(overflow):
+        assert f"warning-{i}" not in _logger._seen_logs
+    for i in range(_MAX_SEEN_LOGS, _MAX_SEEN_LOGS + overflow):
+        assert f"warning-{i}" in _logger._seen_logs
+
+
 def test_log_exception_once():
     """Test we only log with warning level once."""
-    QuietLogger._seen_logs = {}
+    _logger._seen_logs.clear()
     quiet_logger = QuietLogger()
     exc = Exception()
     with (
diff --git a/tests/test_protocol.py b/tests/test_protocol.py
index edd87c2e..903c6692 100644
--- a/tests/test_protocol.py
+++ b/tests/test_protocol.py
@@ -14,6 +14,8 @@
 
 import zeroconf as r
 from zeroconf import DNSHinfo, DNSIncoming, DNSText, const, current_time_millis
+from zeroconf._logger import _MAX_SEEN_LOGS
+from zeroconf._protocol import incoming as _incoming_module
 
 from . import has_working_ipv6
 
@@ -805,6 +807,168 @@ def test_parse_packet_with_nsec_record():
     assert nsec_record.next_name == "MyHome54 (2)._meshcop._udp.local."
 
 
+def test_nsec_bitmap_length_overruns_record_end():
+    """Reject NSEC bitmap whose declared length runs past the record boundary."""
+    # 0 questions, 2 answers. Answer 1 is a malformed NSEC: rdlength=9, but the
+    # bitmap window claims length=255 — overrunning the record. Answer 2 is a
+    # PTR that must still parse because the offset for the next record stays
+    # pinned to the NSEC's declared end.
+    packet = (
+        b"\x00\x00\x84\x00\x00\x00\x00\x02\x00\x00\x00\x00"
+        b"\x04test\x05local\x00"
+        b"\x00\x2f\x80\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x09"
+        b"\xc0\x0c"
+        b"\x00\xff"
+        b"\x80\x00\x00\x00\x00"
+        b"\xc0\x0c"
+        b"\x00\x0c\x00\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x02"
+        b"\xc0\x0c"
+    )
+    parsed = r.DNSIncoming(packet)
+    answers = parsed.answers()
+    ptrs = [a for a in answers if isinstance(a, r.DNSPointer)]
+    assert len(ptrs) == 1
+    assert ptrs[0].alias == "test.local."
+    # The malformed NSEC must not surface — if it did, it would carry rdtypes
+    # synthesized from bytes past the record boundary.
+    assert not any(isinstance(a, r.DNSNsec) for a in answers)
+
+
+def test_nsec_bitmap_zero_length_window_rejected():
+    """A bitmap window with length=0 violates RFC 4034 §4.1.2 and must be rejected."""
+    packet = (
+        b"\x00\x00\x84\x00\x00\x00\x00\x02\x00\x00\x00\x00"
+        b"\x04test\x05local\x00"
+        b"\x00\x2f\x80\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x04"
+        b"\xc0\x0c"
+        b"\x00\x00"
+        b"\xc0\x0c"
+        b"\x00\x0c\x00\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x02"
+        b"\xc0\x0c"
+    )
+    parsed = r.DNSIncoming(packet)
+    answers = parsed.answers()
+    ptrs = [a for a in answers if isinstance(a, r.DNSPointer)]
+    assert len(ptrs) == 1
+    assert not any(isinstance(a, r.DNSNsec) for a in answers)
+
+
+def test_nsec_bitmap_truncated_window_header_rejected():
+    """Reject NSEC bitmap with a trailing byte too short to hold a window header."""
+    packet = (
+        b"\x00\x00\x84\x00\x00\x00\x00\x02\x00\x00\x00\x00"
+        b"\x04test\x05local\x00"
+        b"\x00\x2f\x80\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x06"
+        b"\xc0\x0c"
+        b"\x00\x01\x80"
+        b"\xff"
+        b"\xc0\x0c"
+        b"\x00\x0c\x00\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x02"
+        b"\xc0\x0c"
+    )
+    parsed = r.DNSIncoming(packet)
+    answers = parsed.answers()
+    ptrs = [a for a in answers if isinstance(a, r.DNSPointer)]
+    assert len(ptrs) == 1
+    assert ptrs[0].alias == "test.local."
+    assert not any(isinstance(a, r.DNSNsec) for a in answers)
+
+
+def test_txt_rdlength_overruns_packet_rejected():
+    """A TXT record with rdlength past the buffer must not enter the cache.
+
+    Python slicing silently truncates when the slice end exceeds the buffer,
+    so without a bounds check in ``_read_string`` a malformed wire frame
+    would land in the cache carrying a payload shorter than the rdlength
+    declared, leaving the parser desynchronized for downstream records.
+    """
+    packet = (
+        b"\x00\x00\x84\x00\x00\x00\x00\x01\x00\x00\x00\x00"
+        b"\x04test\x05local\x00"
+        b"\x00\x10\x80\x01"
+        b"\x00\x00\x11\x94"
+        b"\xff\xff"
+        b"\x05hello"
+    )
+    parsed = r.DNSIncoming(packet)
+    assert parsed.valid
+    assert parsed.answers() == []
+
+
+def test_hinfo_character_string_length_overruns_record_rejected():
+    """A HINFO character string declaring more bytes than remain must be rejected."""
+    packet = (
+        b"\x00\x00\x84\x00\x00\x00\x00\x01\x00\x00\x00\x00"
+        b"\x04test\x05local\x00"
+        b"\x00\x0d\x80\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x07"
+        b"\x03cpu"
+        b"\xff\xff\xff"
+    )
+    parsed = r.DNSIncoming(packet)
+    assert parsed.valid
+    assert not any(isinstance(a, r.DNSHinfo) for a in parsed.answers())
+
+
+def test_a_record_rdlength_overruns_packet_rejected():
+    """An A record whose 4-byte address would walk past the buffer must be rejected."""
+    packet = (
+        b"\x00\x00\x84\x00\x00\x00\x00\x01\x00\x00\x00\x00"
+        b"\x04test\x05local\x00"
+        b"\x00\x01\x80\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x04"
+        b"\xc0\xa8"
+    )
+    parsed = r.DNSIncoming(packet)
+    assert parsed.valid
+    assert not any(isinstance(a, r.DNSAddress) for a in parsed.answers())
+
+
+def test_record_consuming_more_than_rdlength_dropped_and_resyncs():
+    """A record whose decoded fields overrun its rdlength must drop and resync.
+
+    The first answer is a HINFO with ``rdlength=2`` and rdata ``\\x01x`` (one
+    char string ``"x"``). The second character string's length byte then comes
+    from the next record's name (``\\x00``, root domain), so the HINFO would
+    silently parse as ``cpu="x", os=""`` but leave the offset one byte past
+    the declared end, smearing the second record's framing. With the per-record
+    boundary check the bogus HINFO is dropped and the second record decodes.
+    """
+    packet = (
+        b"\x00\x00\x84\x00\x00\x00\x00\x02\x00\x00\x00\x00"
+        b"\x04test\x05local\x00"
+        b"\x00\x0d\x80\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x02"
+        b"\x01x"
+        b"\x00"
+        b"\x00\x0c\x00\x01"
+        b"\x00\x00\x11\x94"
+        b"\x00\x02"
+        b"\xc0\x0c"
+    )
+    parsed = r.DNSIncoming(packet)
+    answers = parsed.answers()
+    assert not any(isinstance(a, r.DNSHinfo) for a in answers)
+    ptrs = [a for a in answers if isinstance(a, r.DNSPointer)]
+    assert len(ptrs) == 1
+    assert ptrs[0].alias == "test.local."
+
+
 def test_records_same_packet_share_fate():
     """Test records in the same packet all have the same created time."""
     out = r.DNSOutgoing(const._FLAGS_QR_QUERY | const._FLAGS_AA)
@@ -962,6 +1126,38 @@ def test_dns_compression_generic_failure(caplog):
     assert "Received invalid packet from ('1.2.3.4', 5353)" in caplog.text
 
 
+def test_seen_logs_is_bounded():
+    """Corrupt packets from varying peers fill ``_seen_logs`` exactly to the cap."""
+    packet = (
+        b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x06domain\x05local\x00\x00\x01"
+        b"\x80\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0\x05-\x0c\x00\x01\x80\x01\x00\x00"
+        b"\x00\x01\x00\x04\xc0\xa8\xd0\x06"
+    )
+    overflow = 5
+    _incoming_module._seen_logs.clear()
+    # Snapshot the actual key the parser inserted per port. This is whatever
+    # ``str(exc_info()[1])`` produces today — the test stays agnostic to the
+    # exception text format so a future normalization of the message (see
+    # the discussion on #1714) doesn't break the assertions, while still
+    # pinning that the parser exception path actually entered the dict.
+    keys_per_port: list[str] = []
+    for port in range(_MAX_SEEN_LOGS + overflow):
+        r.DNSIncoming(packet, ("1.2.3.4", port))
+        keys_per_port.append(next(reversed(_incoming_module._seen_logs)))
+    # Bound is hit exactly.
+    assert len(_incoming_module._seen_logs) == _MAX_SEEN_LOGS
+    # Each port produced a distinct dedup key — a regression that dropped
+    # the per-packet-varying component (e.g. self.source) from the exception
+    # text would collapse all 517 calls to one key and fail this.
+    assert len(set(keys_per_port)) == _MAX_SEEN_LOGS + overflow
+    # FIFO eviction by key identity (no substring matching on the message
+    # format): the earliest ports' keys are gone, the latest ports' remain.
+    for port in range(overflow):
+        assert keys_per_port[port] not in _incoming_module._seen_logs
+    for port in range(_MAX_SEEN_LOGS, _MAX_SEEN_LOGS + overflow):
+        assert keys_per_port[port] in _incoming_module._seen_logs
+
+
 def test_label_length_attack():
     """Test our wire parser does not loop forever when the name exceeds 253 chars."""
     packet = (
@@ -1011,6 +1207,28 @@ def test_label_compression_attack():
     assert len(parsed.answers()) == 1
 
 
+def test_dns_compression_pointer_chain_depth_attack() -> None:
+    """Test our wire parser rejects deeply chained compression pointers without recursing."""
+    # Build a packet with one question whose name is a 1500-deep chain of forward
+    # compression pointers, ending in a root label. Each pointer is 2 bytes,
+    # so chain length easily exceeds CPython's default recursion limit.
+    header = b"\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00"
+    # Question at offset 12: pointer to offset 18 (past the question's type/class).
+    question_name = bytes([0xC0, 18])
+    question_type_class = b"\x00\x01\x00\x01"
+    chain_depth = 1500
+    chain = bytearray()
+    for i in range(chain_depth):
+        target = 18 + 2 * (i + 1)
+        chain.append(0xC0 | (target >> 8))
+        chain.append(target & 0xFF)
+    chain.append(0x00)
+    packet = header + question_name + question_type_class + bytes(chain)
+    parsed = r.DNSIncoming(packet, ("1.2.3.4", 5353))
+    assert parsed.valid is False
+    assert parsed.questions == []
+
+
 def test_dns_compression_loop_attack():
     """Test our wire parser does not loop forever when dns compression is in a loop."""
     packet = (
diff --git a/tests/test_services.py b/tests/test_services.py
index 7d7c3fc7..218afc2a 100644
--- a/tests/test_services.py
+++ b/tests/test_services.py
@@ -5,7 +5,6 @@
 import logging
 import os
 import socket
-import time
 import unittest
 from threading import Event
 from typing import Any
@@ -34,6 +33,7 @@ def teardown_module():
 
 
 class ListenerTest(unittest.TestCase):
+    @pytest.mark.usefixtures("quick_timing", "quick_request_timing")
     def test_integration_with_listener_class(self):
         sub_service_added = Event()
         service_added = Event()
@@ -112,8 +112,10 @@ def update_service(self, zeroconf, type, name):
             service_added.wait(1)
             assert service_added.is_set()
 
-            # short pause to allow multicast timers to expire
-            time.sleep(3)
+            # Drain pending multicast announces from the registrar instead
+            # of sleeping for them — same pattern as PR #1701.
+            zeroconf_registrar.out_queue.queue.clear()
+            zeroconf_registrar.out_delay_queue.queue.clear()
 
             zeroconf_browser.add_service_listener(type_, DuplicateListener())
             duplicate_service_added.wait(
diff --git a/tests/test_updates.py b/tests/test_updates.py
index d8b16083..9112ed7b 100644
--- a/tests/test_updates.py
+++ b/tests/test_updates.py
@@ -29,7 +29,7 @@ def teardown_module():
         log.setLevel(original_logging_level)
 
 
-def test_legacy_record_update_listener():
+def test_legacy_record_update_listener(quick_timing: None) -> None:
     """Test a RecordUpdateListener that does not implement update_records."""
 
     # instantiate a zeroconf instance
diff --git a/tests/utils/test_asyncio.py b/tests/utils/test_asyncio.py
index 7989a82c..665bc867 100644
--- a/tests/utils/test_asyncio.py
+++ b/tests/utils/test_asyncio.py
@@ -86,18 +86,22 @@ async def _still_running():
         await asyncio.sleep(5)
 
     def _run_coro() -> None:
-        runcoro_thread_ready.set()
         assert loop is not None
+        future = asyncio.run_coroutine_threadsafe(_still_running(), loop)
+        runcoro_thread_ready.set()
         with contextlib.suppress(concurrent.futures.TimeoutError):
-            asyncio.run_coroutine_threadsafe(_still_running(), loop).result(1)
+            future.result(0.1)
 
     runcoro_thread = threading.Thread(target=_run_coro, daemon=True)
     runcoro_thread.start()
     runcoro_thread_ready.wait()
 
-    time.sleep(0.1)
     assert loop is not None
-    aioutils.shutdown_loop(loop)
+    # Patch _TASK_AWAIT_TIMEOUT so the inner `asyncio.wait` returns
+    # within 50ms instead of blocking the full 1s on the deliberately
+    # never-completing _still_running() task.
+    with patch.object(aioutils, "_TASK_AWAIT_TIMEOUT", 0.05):
+        aioutils.shutdown_loop(loop)
     for _ in range(5):
         if not loop.is_running():
             break
@@ -105,6 +109,7 @@ def _run_coro() -> None:
 
     assert loop.is_running() is False
     runcoro_thread.join()
+    loop.close()
 
 
 def test_cumulative_timeouts_less_than_close_plus_buffer():
@@ -123,19 +128,25 @@ async def test_run_coro_with_timeout() -> None:
     """Test running a coroutine with a timeout raises EventLoopBlocked."""
     loop = asyncio.get_event_loop()
     task: asyncio.Task | None = None
+    task_created = asyncio.Event()
 
     async def _saved_sleep_task():
         nonlocal task
-        task = asyncio.create_task(asyncio.sleep(0.2))
-        assert task is not None
+        task = asyncio.create_task(asyncio.sleep(1))
+        task_created.set()
         await task
 
     def _run_in_loop():
-        aioutils.run_coro_with_timeout(_saved_sleep_task(), loop, 0.1)
+        aioutils.run_coro_with_timeout(_saved_sleep_task(), loop, 50)
 
     with pytest.raises(EventLoopBlocked), patch.object(aioutils, "_LOADED_SYSTEM_TIMEOUT", 0.0):
         await loop.run_in_executor(None, _run_in_loop)
 
+    # The outer .result() can raise EventLoopBlocked before the loop
+    # has scheduled the coroutine — wait until the inner task is
+    # created before asserting on it. Use an asyncio.Event so the
+    # wait yields back to the loop instead of blocking it.
+    await asyncio.wait_for(task_created.wait(), 1.0)
     assert task is not None
     # ensure the thread is shutdown
     task.cancel()
diff --git a/tests/utils/test_name.py b/tests/utils/test_name.py
index 1feb7713..31830fae 100644
--- a/tests/utils/test_name.py
+++ b/tests/utils/test_name.py
@@ -28,11 +28,11 @@ def test_service_type_name_overlong_full_name():
 
 
 @pytest.mark.parametrize(
-    "instance_name, service_type",
-    (
+    ("instance_name", "service_type"),
+    [
         ("CustomerInformationService-F4D4885E9EEB", "_ibisip_http._tcp.local."),
         ("DeviceManagementService_F4D4885E9EEB", "_ibisip_http._tcp.local."),
-    ),
+    ],
 )
 def test_service_type_name_non_strict_compliant_names(instance_name, service_type):
     """Test service_type_name for valid names, but not strict-compliant."""
@@ -61,6 +61,28 @@ def test_service_type_name_non_strict_compliant_names(instance_name, service_typ
     assert instance_name_from_service_info(info, strict=False) == instance_name
 
 
+@pytest.mark.parametrize(
+    ("type_", "expected"),
+    [
+        ("_http._tcp.LOCAL.", "_http._tcp.LOCAL."),
+        ("_http._TCP.local.", "_http._TCP.local."),
+        ("_HTTP._tcp.local.", "_HTTP._tcp.local."),
+        ("Instance._http._tcp.LOCAL.", "_http._tcp.LOCAL."),
+        ("_ntp._udp.LOCAL.", "_ntp._udp.LOCAL."),
+        ("_ntp._UDP.local.", "_ntp._UDP.local."),
+        ("Instance._ntp._udp.LOCAL.", "_ntp._udp.LOCAL."),
+    ],
+)
+def test_service_type_name_uppercase_trailer(type_, expected):
+    """RFC 1035 §2.3.3 / RFC 6762 §16 — DNS names are case-insensitive."""
+    assert nameutils.service_type_name(type_) == expected
+
+
+def test_service_type_name_uppercase_local_non_strict():
+    """Non-strict mode accepts uppercase .LOCAL. trailer without a protocol label."""
+    assert nameutils.service_type_name("Localhost.LOCAL.", strict=False) == "LOCAL."
+
+
 def test_possible_types():
     """Test possible types from name."""
     assert nameutils.possible_types(".") == set()
diff --git a/tests/utils/test_net.py b/tests/utils/test_net.py
index 7de10661..311e95e6 100644
--- a/tests/utils/test_net.py
+++ b/tests/utils/test_net.py
@@ -131,7 +131,7 @@ def test_normalize_interface_choice_errors():
 
 
 @pytest.mark.parametrize(
-    "errno,expected_result",
+    ("errno", "expected_result"),
     [
         (errno.EADDRINUSE, False),
         (errno.EADDRNOTAVAIL, False),
@@ -357,7 +357,7 @@ def test_create_sockets_interfaces_all_unicast():
         mock_socket = Mock(spec=socket.socket)
         mock_new_socket.return_value = mock_socket
 
-        listen_socket, respond_sockets = r.create_sockets(
+        listen_socket, _respond_sockets = r.create_sockets(
             interfaces=r.InterfaceChoice.All, unicast=True, ip_version=r.IPVersion.All
         )