What is Reverse DNS or PTR Record ?

Last modified: March 30, 2020
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Reverse DNS (or sometimes called as PTR record) is a DNS record that helps to determine the domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet.

The PTR record is an A record opposite. While the A record points a domain name to an IP address, the PTR record resolves the IP address to a domain/hostname. For the reverse DNS (Domain Name System) lookup search PTR records are used. The corresponding domain / hostname can be obtained by using the IP address as a result of the lookup. An A record should exist for every PTR record.

Using a reverse DNS setup for a mail server is a best solution. Before accepting messages originating from your mail server, some external mail exchange servers make reverse DNS lookups.

More information is available via the link below:

Wikipedia on PTR Record / Reverse DNS

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