The rest of the IP addresses (outside that /28) you can define with PTR in the normal way, whenever you like. It's not necessary to define them all, if they don't have a PTR record, that's alright.

So in your zone file on your 2 namservers you'll have

224/28  IN      NS      ns1.otherserver.com.
224/28  IN      NS      ns1.otherserver.com.

26      IN      PTR     foo1.example.com.
27      IN      PTR     foo2.example.com.
28      IN      CNAME   28.224/28.79.73.217.in-addr.arpa.
29      IN      CNAME   29.224/28.79.73.217.in-addr.arpa.
[..]
43      IN      CNAME   43.224/28.79.73.217.in-addr.arpa.
44      IN      PTR     foo3.example.com.

You only have to have the CNAMEs for _all_ the IP addresses in that /28 subnet, because you want to delegate them all to the other nameserver.

On 03/25/2010 06:50 PM, Athiqur Rahman wrote:
Looking at the link below. It looks like that I will have to create
CNAME entry for every IP in the /28 subnet, That is 16 CNAME entries?
The nameserver that I am sending to will have to create a zone record
called 224/28.79.73.217.in-addr.arpa?

I am thinking do I have to define the rest of the IP addreses or will
just simple defining that one /28 be enough? Will the rest of the IP
addresses fall into the umbrella of the main NS definition in the zone
record?

Imre Gergely wrote:

You mean delegating a subnet to another nameserver? This may help:

http://www.zytrax.com/books/dns/ch3/#reverse

On 03/25/2010 05:53 PM, Athiqur Rahman wrote:
Hi,

I have the following zone 79.73.217.in-addr.arpa with the NS set as my 2
name servers.

What i want to do is just forward reverse dns requests for
217.73.79.224/28 to another name server. What would be the best way to
go about this?

Thanks
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