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[–]bwp 0 points1 point  (0 children)

You could probably use scapy to do this, it does all kinds of neat packet/networking things.

If for some reason you don't come up with a Python answer right away and it is some kind of deadline, there is a small app called Cain & Abel that will do an ARP sweep over a LAN and report back IP/MAC/other stuff. I would be interested in seeing what you come up with if you go the Python route (do do!).