how to block ALL AIM traffic ?

[Realized Mofo <realized () gmail com>]

I am at an office with 50~ machines , out of thoes about 20 or so use
AIM. I would like to block AIM and normally i'd just block the AIM
port (5190) or whatever it is..

BUT AOL seems to have found a great way around this and has 4000+
diffrent ports they use and i'd assume lots of diffrent hosts.


Whats the best way of blocking all AIM traffic ?