[jesboat]

Was that on ethernet? If so, there's nothing particularly nefarious: each building had a /24 and the building's name was in the reverse dns. It's not particularly different from how many [citation needed] commercial ISPs have town names in reverse dns, except the subnetting mirrors geography in a bit more detail. Dorm ethernet has since died.

If it was over WiFi, I would be much more concerned

[dmurray]

What's different about it being on WiFi, where you most likely would be connecting to a base station in the same building that was then wired in over ethernet?

[jesboat]

They didn't (and probably still don't) subnet by building on wifi, so more precise location than "on Brown's wifi" would have required intentional information sharing.

[vermilingua]

Why would wifi be more concerning? The access points would presumably be broadcasting the same subnets as are available on ethernet.