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I doubt they were very concerned with you or your friends. 80/20 solutions.

Only had problems when a classmate was running routed.

Oh, and all authorized IPs were in a public address space.

Out of curiosity, you couldn’t just guess them based on knowing a couple? Or do people assigning them in some fashion that isn’t consecutive within the block?

yeah, definitely not consecutive.

You simply weren't that much of a concern. DHCP snooping takes care of that problem quite well.