Reverse DNS problem

[Pete Walker]

I manage 3 name servers, 2 on 1 class C subnet (193.133.13.128/25) and one
on another class C subnet (212.248.239.128/25).

I wish to manage our rDNS PTR records on our DNS servers, which I am doing
currently for the 193 hosts on the primary NS, which is on the 193 network.
This is also the primary NS for the domain name of the hosts on the 212
subnet which I wish to manage.
Can I create the PTR records in an in-addr.arpa zone file on the 193 NS or
does it need to be on a NS on the 212 range?

Thanks in advance for any help.

Pete Walker.