What are PTR Records?
A pointer record, or PTR record, is a type of Domain Name System (DNS) record used for the reverse DNS lookup.
Reverse DNS lookups allow you to find the domain name, or hostname, for any specified IP address – the opposite of a regular DNS lookup.
Note: An A record should exist for every PTR Record.
Here’s an example of a PTR record with the domain being hostname.example.com, and the IP address being 192.168.0.1.
Note how the Host field looks like the IP address in reverse, followed by ” in-addr.arpa”. This is the form that PTR records follow.