Non-Octet Boundary Delegation (RFC 4183)

Peter Rathlev peter at
Thu Sep 22 12:35:47 UTC 2011

On Thu, 2011-09-22 at 15:56 +0400, Станислав wrote:
> I need to have reverse records for (from to
> been resolved by our dns server but other networks (all
> of except of need to be resolved by
> upstream DNS server and I'm not sure how it's possible to configure
> BIND + DHCPD for it.
> In case I use configuration suggested by Andris it doesn't resolve
> names by IP addresses.
> nslookup
> Server:
> Address:
> ** server can't find NXDOMAIN

That's a problem on the name server (BIND?) and not the DHCP server.

Delegating on non-8-bit boundaries is no problem if it's less than 24
bits. To delegate you just delegate the following zones:

Keep in mind that this is strictly DNS stuff, and not related to DHCP as
such. ISC DHCPd will have no problem finding and updating the correct
zone as long as your delegations are sane.


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