Here is a list of the different DNS record types you could add to your Reverse DNS zone.
The PTR record, or also known as a pointer record, has a very precise and important function. Its goal is to link the IP address to the domain name. In addition, there is a piece of good news, and it is able to perform successfully both with IPv4 addresses and IPv6 addresses. Moreover, this type of DNS record is an essential piece required for you to have Reverse DNS. It is able to exist only in the Reverse DNS zone. So, it would be best if you did not place it in the Forward DNS zone.