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1.
To be banned from a vBulletin forum by your class C IP address range.

ie you post something naughty under 192.168.32.145 and they then ban the whole 192.168.32.x range, causing you to have to change ISP's to repost.
last night I spammed the fuck out of the Harmony Central forums and those fuckers assbanned me on Class C.
by assmaster May 23, 2004