Occasionally the same spammer will register from the same IP multiple times in the few minutes it takes for it to be reported to the Stopforumspam database. This is in vB3 software. Xenforo might have this covered already but I can't see any options. We had the following registrations on 28th October over 3 minutes (on vB3 software- haven't moved over yet). I know it wouldn't stop all spam but it would be easier to deal with if we could specify a time limit of a few minutes before further successful new registrations from the same IP. Remember a post from Kier about being plagued by an IP in the past. Just an idea if you don't already have it covered after that.