Dear DNS Coach,
What is a PTR Record used for?
First of all, let’s discuss what a PTR Record (or Pointer Record) is before we go into what it is used for.
A PTR Record is used to map a network interface (or IP) to a host name. These records are most often used for reverse DNS.
Reverse DNS (rDNS) is the method of resolving an IP address into a domain name, just as DNS resolves domain names into associated IP addresses.
[ This is what it looks like when you add a PTR Record in DNS Made Easy ]
The end result of this record is that: 192.168.1.10/27.in-addr.arpa. points to mail.example.com.
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Also published on Medium.