[dns-operations] check if a domain has been registered via DNS
pyh at vodafonemail.de
Fri Apr 28 10:15:27 UTC 2017
I have made an update in the original document,
If the method returns true, most time domain has got taken. But there
are few ccTLDs which have wildcards setup, though this is really bad
behavior, they break the rule here. For example, .fm domain has wildcard
setup, queries to any non-exists .fm domain will get response of
NOERROR, rather than NXDOMAIN.
If the method returns false, it may or may not indicate domain has not
been taken. For example, when input yahoo.uk, it returns false, but you
can't register yahoo.uk at all, because uk's registry keeps it but
doesn't delegate DNS to it.
So using this tool for reference only, maybe as a fast filter before whois.
Thanks for everybody's message.
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