== About blocking computers == 

 Hi, I saw something here about blocking a computer? I'm just wondering on how would you do that (Is an add-on needed)? The Wikis that I work on are being hit by a single person that changes their IP to avoid blocks and continues to vandalize on many new accounts so the IP/User blocks don't really work. A computer block might be more effective and permanent but I can't seem to find how on Google. T_T Thanks,