All IP addresses have a delegated DNS server that is used to provide the reverse DNS information.
To find ou which DNS server is the authoarative one for your IP you can use nslookup:
nslookup
set type=SOA
8.8.8.8
Will then return the authorative nameserver - we will then need to request an PTR record is added for us (assuming we don't have access to the DNS server!)
For example:
8.8.8.in-addr.arpa. 900 IN PTR mailserver.example.com.
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