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Old 04-12-2007, 12:25 AM   #1
Registered: Mar 2007
Distribution: Redhat &CentOS
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what is the actual use of PTR record in DNS


Can anyone tell me , what is the actual work done by PTR record in a reverse DNS???? How it is functioning??? What will happen if there is no PTR record exists????
Old 04-12-2007, 01:15 AM   #2
Registered: Dec 2003
Distribution: Debian, FreeBSD
Posts: 310

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I'm not sure what you want to know based on the first 2 questions.

It works just like any other tld. PTR records are put under ".arpa" in the zone

What will happen if there is no PTR record exists????
Generally nothing. Its not required to have a PTR record. Sometimes mail servers will perform a reverse lookup on the sending IP. Some ssl sites require reverse DNS, and you may see a slow initial connection when using ssh if there is a lack of a reverse mapping.


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