dns.md

dns

[Docs]

• dns.resolve() now supports resolving plain DNS PTR records. Previously, calling dns.resolve(hostname, 'PTR', cb) would call dns.reverse() on the hostname. That is no longer the case. One must now pass the hostname as a reverse IN-ADDR domain.
  • Refs: 4921

Before:

dns.resolve('8.8.4.4', 'PTR', (err, result) => {
  if (err) {
    // handle error
  }
  // result => ['google-public-dns-b.google.com']
});

After:

dns.resolve('4.4.8.8-in-addr.arpa', 'PTR', (err, result) => {
  if (err) {
    // handle error
  }
  // result => ['google-public-dns-b.google.com']
});

// one could also simply do
dns.reverse('8.8.4.4', (err, result) => {
  if (err) {
    // handle error
  }
  // result => ['google-public-dns-b.google.com']
});

• dns.lookupService(host, port, callback) Previously, if port was not a number, a TypeError would be thrown. Now, the port will be coerced to a number. If the port is outside the range of 0-65535, a TypeError will be thrown.