Multiple Origin Statements

[Shawn]

I am responsible and authoritative for 2 domains, and 1 sub-domain
delegation. Those are simple. What I am having a problem with, is the
way the DNS was setup, and how to properly setup some specific IP's
accross multiple zones, that I am not authoritative for, but must
reference in my DNS as part of my other zones.

To clarify:

zone1.domain.com  IN A aaa.bbb.ccc.111
zone1.domain.com  IN A aaa.bbb.eee.222
zone1.domain.com  IN A aaa.bbb.fff.333

Now I have only been given a few specific IP's and have been informed
that it will not be included in my upstream DNS provider (Government
Work).

I am to be authoritative for a few (about 6) different IP's that are
in other Class B networks, that I am not authoritative for, but must
resolve, while still allowing all my internal workstations access to
the rest of these zones that are maintained by my upstream provider.

Hope that is clear.  Any takers?  How the heck to you provide
resolution for specific IP's without poisoning your zone files with
out-of-zone entries.  And if I create zone files for these zones, then
my server will consider itself authorative, and I won't be able to
reach the other devices on the other network, which are part of that
zone...  I am perplexed.

I asked for a simple subnet of just 5 or so IP's say a 240, or so, but
that was quashed.  They claim they've been doing this way for years,
and nothing is going to change.  It is for me to make it work.

HELP!

Shawn