Going back to what someone else mentioned earlier - this only searches through the last recorded IP for each user.
Another really fine way of busting people with many psuodonyms is to check back through their posts and see which IPs were used by different users at the same time, or within 15 mins of each other. I get this with people coming on as themselves, making a few posts then switching to their alter ego and causing some [better wash my mouth][better wash my mouth][better wash my mouth][better wash my mouth].
Who's up for helping writing a bit of SQL to do that!?
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