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DNS look up against a specific DNS provider
From: supermegatron at gmail.com (Jonathan Moore)
Date: Thu, 25 Jun 2009 13:05:00 -0500

On Thu, Jun 25, 2009 at 12:32 PM, Adrian Crenshaw<irongeek at irongeek.com> wrote:
Does anyone know a way to specify a reverse DNS look up against a specific
DNS provider? I don't want to use the DNS that is authoritive for? the given
IP range. For example, look up all of the IPs at my org to see if any are
mapped to some host name at DYNDNS? Some bot nets use these services for
naming, so I thought this might be useful.

I may be misunderstanding, but both nslookup and dig let you specify
the server to query.  Using dig, adding @server.example.org to the
command tells dig to query only that server (IIRC).

 dig @ns1.everydns.net yahoo.com



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