What is a PTR record?
It is the opposite of an A record, which maps a domain name to an IP address. PTR records are essential for verifying the authenticity of an IP address, particularly in email delivery and anti-spam measures.
While the main purpose of the Domain Name System is to point domains to IP addresses, a PTR record works in the opposite way – it associates an IP with a domain name. Because of its purpose, a PTR record is sometimes called a Reverse DNS Record. The purpose of a PTR record is mostly administrative – it shows that an IP is in fact used with a particular domain.
