TCP Wrappers - unresolved host names

[new dns administrator]

I've just taken over as network administrator for an ISP.
I have 5 class c subnets and I connect to sprintlink.
Sprintlink advertises 3 authoratative servers ns1, ns2 and
ns3 which I believe are actually recursive secondaries.

ANYWAY:
I am having a problem getting ux1.cso.uiuc.edu to recognize
4 of my 5 subnets. My 16 subnet works great but all my dial
in subnets 17-20 are not advertised to the rest of the
world yet I can perform a forward and reverse lookup from
my domain. I believe it to be because the university is
using tcp wrappers and cannot backward resolve my host
addresses. Any ideas?


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