No subject

[bogus@does.not.exist.com ()]

traceroute to something in 192.168.1.x and see if it routes
anywhere....  If it looks like it just goes out to the internet and
then stops, then they are probably not using it for anything you care
about.  If the traceroute completes, then there is a valid destination
on the network using it.

But you should really check with corporate IT to see if what you
propose is allowed...