$ cat dns.js
var dns = require('dns');

dns.resolveSoa('example.org', function(err, soa){
    console.log(soa.nsname);
    dns.resolve4(soa.nsname, function (err, nameServers) {
        console.log(dns.getServers());
        dns.setServers(nameServers);
        console.log(dns.getServers());
    });
});

$ node dns.js
sns.dns.icann.org
[ '10.0.2.3' ]
[ '199.4.28.26' ]

$ node dns.js
sns.dns.icann.org
[ '10.0.2.3' ]
node: ../deps/cares/src/ares_destroy.c:102: ares__destroy_servers_state: Assertion `ares__is_list_empty(&server->queries_to_server)' failed.
Aborted (core dumped)

$ cat /etc/os-release
NAME="Ubuntu"
VERSION="14.04.1 LTS, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04.1 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
$ node -v
v0.12.0