[dns-operations] check if a domain has been registered via DNS

Viktor Dukhovni ietf-dane at dukhovni.org
Thu Apr 27 18:16:48 UTC 2017

> On Apr 27, 2017, at 1:33 PM, Doug Barton <dougb at dougbarton.us> wrote:
> What would work for your situation is to test for the presence of NS records at the registry level, and if they are absent to fall back to whois to confirm.

Some subdomains of public suffix parent domains are CNAMEs, and only
the target of the CNAME has NS records.

;vwtelecom.eu.                  IN      NS

vwtelecom.eu.           86400   IN      CNAME   www.vwtelecom.com.
www.vwtelecom.com.      86400   IN      CNAME   vwtelecom.com.
vwtelecom.com.          86400   IN      NS      ns1.openprovider.nl.
vwtelecom.com.          86400   IN      NS      ns3.openprovider.eu.
vwtelecom.com.          86400   IN      NS      ns2.openprovider.be.


More information about the dns-operations mailing list