User blog comment:SodaCat/Warning to all/@comment-1824274-20110112001503/@comment-34814-20110112010607

Well, there's also IP ranges. Bully Wiki had a big problem with someone we call the "Girl Lover Vandal" because he had a dynamic IP (meaning, he was probably on a dialup connection, so any time he got blocked he could just log out and he'd have a slightly different IP). I actually had to teach myself how to rangeblock because of him. Luckily I kinda like math already so it wasn't too big of an ordeal for me, but it involves converting numbers into binary numbers.

More recently, I got into it with a vandal on Wikipedia who tracked me down and vandalized Bully Wiki. He was from South Africa (seriously) on a /11 range. Wikipedia doesn't even allow blocks on a range smaller than /16, so I had to put like a dozen /16 rangeblocks in place... luckily Bully Wiki is smaller than Wikipedia and has never had any other editors from South Africa before.

That's actually a big part of the reason I'm an admin here when I don't edit too much.