Monday, March 10, 2008

What is a reverse DNS record?

A reverse DNS record (also know as a PTR record), is a reverse mapping from IP to name. For instance, when a lookup is made on the IP of 1.2.3.4, it should come back with host.mydomain.com. It is a very good idea to have the hostname of your server match the PTR record assigned to it's IP. This can only be changed by the owner of the IP address.

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