Is it mandatory to keep PTR record of NS server in zone file?

beer9
beer9 used Ask the Experts™
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Hello, my domain is example.com and my NS server is ns1.example.net

Both are different domain. Should I still keep the IP of ns1.example.net in the zone file of example.com?

Thanks!
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Not only is this "not mandatory", it is wrong.

PTR records match IP addresses to names, not the other way around.  A such, PTR records are not placed in the zone file for the domain itself, but rather the zone file for the IP block. Usually, DNS server authoratitive of the IP block will be administered by your ISP, you have to get them to set up PTR records.
Most Valuable Expert 2015

Commented:
What Mal Osborne said.  And I think that it's smart to have both forward and inverse DNS entries for a nameserver.

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Commented:
Thanks for the answer, I am looking more on whether I should put the *Glue Record* for name server in my zone file?

As we see that  ns1.example.net is different domain than example.com and I am not authorized for inverse lookup zone of  ns1.example.net
Most Valuable Expert 2015
Commented:
The glue record is configured at the registrar for your domain.  Use the fqdn for the glue and the nameserver.

Configure an A record in the forward zone for the nameserver fqdn and a PTR record in the inverse zone that are a match.

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