where is the host table?

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I would like to write a reverseloop up tool, for our help desk...  Sometimes
a user will call with a printer issue, but won't know the outq name, but
they do know the IP address of the printer, so I would like to write a
program that will accept an IP, bounce it against the host ip table, and
then bounce the returned names against the outq names...

so I have actually 2 questions, is their a table for the ip values, and is
their a table for the outq that are available...  or at the very least a way
to print these values to an outfile...

Thanks, tim