[dns-operations] check if a domain has been registered via DNS
pyh at vodafonemail.de
Fri Apr 28 01:39:11 UTC 2017
在 2017/4/28 上午2:16, Viktor Dukhovni 写道:
>> 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.
> ;; QUESTION SECTION:
> ;vwtelecom.eu. IN NS
> ;; ANSWER SECTION:
> 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.
This module doesn't query NS info from the authorized nameservers, but
from domain's parent nameservers, which are in the registry.
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