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

[Peng Yonghua]

在 2017/4/27 下午9:55, Ray Bellis 写道:
>> I found the querying is much faster than whois.  module URL:
>> http://search.cpan.org/~pyh/Net-Domain-Registration-Check-0.02/lib/Net/Domain/Registration/Check.pm
> Many registries permit a domain to be registered without requiring it to
> be delegated.  Such domains would fail your test.

thanks. yes I found domain.uk falled into this case.
i.e, yahoo.uk isn't avaiable for domain registration, but it has no DNS 
delegation.

regards.
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