Newbie question: different IP ranges in same reverse file?

[Kevin Darcy]

nospam at wanted.com wrote:

>Hi.
>Our ISP has allocated different IP address ranges to two different offices 
>(say 194.131.x.x to one office and 64.191.x.x to the other).  However, 
>both sites have internet facing machines that belong to the same domain 
>(say johndoe.com).  All of the PTR records in the 1.1.131.194.in-addr.arpa 
>file reflect only the last octet (if that is the correct terminology) of 
>the IP address in the 194.131.x.x range.  However, I have one machine at 
>that other site that must be referenced for purposes of the Reverse 
>lookup.
>
>Can I put an entry in the 1.1.131.194.in-addr.arpa file with the format 
>(for example):
>
>2.1.191.64     PTR   someserver.johndoe.com.
>
No, absolutely not. Such an entry would be rejected from the 
1.131.194.in-addr.arpa or 131.194.in-addr.arpa zone file as "data 
outside zone". Each zone file must contain only data which is actually 
in the zone, or, as a kind of special case, "glue" data which relates to 
descendants of that zone.

>The IP address is completely different from the other addresses in the 
>range, but both belong to the domain johndoe.com.  I don't think I can 
>have two reverse files for the same domain.
>
Your reverse zones and forward zones are independent of each other. Just 
as you can have multiple forward zones, you can have multiple reverse 
zones too. I have hundreds of each on my nameservers.

- Kevin