PTR record
PTR records resolve IP addresses into hostnames . A PTR record is the reverse of an A record. The PTR record should point to hostnamename that can be resolved back to the IP address.
PTR record maps an IP address to a domainname. Suppose A record of your domain.com is 192.168.0.1 then PTR record resolves as
1.0.168.192.in-addr.arpa PTR IN domain.com.
The naming rule of PTR records almost always organized into separate zones which is called as reverse zones. consider the example, a typical reverse zone for a class C subnet would be named "0.168.192.in-addr.arpa.", The numbers stand for the octets of the subnet address 192.168.0.1/24.
Usage:
A PTR record is normally design for convenience and completeness. It is required by some security purpose.
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Regards,
Tukaram
System Admin
Host.co.in
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