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need recommendation for domain registry site

Apr 28, 2005 6:48 pm

re: re: need recommendation for domain registry site

Gilbert Nieuwenhuis

A normal DNS query would be of the form 'what is the IP of host=www in domain=mydomain.com'. There are times however when we want to be able to find out the name of the host whose IP address = x.x.x.x. Sometimes this is required for diagnostic purposes more frequently these days it is used for security purposes to trace a hacker or spammer, indeed many modern mailing systems use reverse mapping to provide simple authentication using dual look-up, IP to name and name to IP.

In order to perform Reverse Mapping and to support normal recursive and Iterative (non-recursive) queries the DNS designers defined a special (reserved) Domain Name called IN-ADDR.ARPA. This domain allows for all supported Internet IPv4 addresses (and now IPv6).

Hope this helps
Gilbert

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