Classless reverse lookups

Kevin Darcy kcd at
Tue Mar 27 22:32:46 UTC 2001

You won't be able to do a "dig -x" successfully until your
ISP sets up their reverse zone with the delegation and the CNAMEs, or you
temporarily set up a "fake" version of their reverse zone.

To check the entry in the absence of CNAMEs, try "dig
230.224/ ptr".

- Kevin

Sean German wrote:

> Howdy,
> I feel a little like a brick asking about a subject for which there is so
> much material in the archives; then again if it was a simpler issue there
> wouldn't be as many questions on the subject.
> Anyway,  Bind 8.2.3 on RH 7 running chroot'ed.  All is well except the
> classless lookups on one zone.  IP #s in that classless range
> aren't recognized as being in that zone.  A 'dig -x' (all IPs
> have been changed to protect the innocent) gives the SOA of the ISP
> providing the IP range.
> I know getting the ISP and the rest of the world to recognize my dns as
> master for the zone is a whole 'nother ball if wax, but at this point I'm
> working on getting my server to act as authority for the classless range.
> I read the rfc at but haven't been able
> to pick up where I went wrong.  Named isn't logging any errors or warnings
> when loading the zones.
> Any pointers are greatly appreciated.
> Sean.
> "named.conf"
> zone "224/" IN {
>         type master;
>         file "named.";
> };
> "named."
> $ORIGIN 224/
> $TTL 20d
> @       IN      SOA     ... ...  ( ... )
> ; Name Servers
>                      IN      NS
> ; Addresses
> 230              PTR   

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