Set guest to post limits of five or more before they can view lists. As we all mentioned earlier, it is only when a human spammer directly invades your forum, that you need to worry and report them. Bots just like any other insect, is a pest that can be dealt with in very simple precautionary measures.
As for cataloging these IP, that has already been done at 'stopforumspam.com' they already have a long list of reported IPs you can check against.
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