Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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The owner of the IP block has to set up reverse DNS. It's largely ignored these days, but some quirky things still need it. Hopefully they have control over the block, to find out who ARIN has assigned it to, you can whois your IP.
xx.xx.xx.xx.in-addr.arpa. IN NS mail.mydomain.com.
The above is a delegation record, not a PTR record. Your ISP would enter this on their name server to delegate the SOA for the PTR record towards your name server. Should your ISP actually delegate PTR record SOA's (most do not), then the reverse zone file (not forward) on your name server would have:
xx.xx.xx.xx.in-addr.arpa. IN PTR mail.mydomain.com.
BTW: As others have pointed out, ISP's do not "typically" delegate PTR records to a customers name servers. But most will make the PTR record change on their name servers. Same net effect, but you have to go through the ISP to make any PTR changes.