Knowledgebase
How do I do a reverse DNS lookup?
Posted by Van Glass on 15 March 2007 11:33 PM
To perform a reverse DNS lookup you must first reverse the IP address and then append a ".in-addr.arpa" to the reversed address. This will give you the domain you need to perform a reverse lookup.

For example. The IP address for www.yahoo.com is 66.94.230.50
To perform a reverse lookup on this you would pass in the domain
50.230.94.66.in-addr.arpa
which returns a pointer to:
p19.www.scd.yahoo.com

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