Also something to keep in mind when banning IP or IP blocks. If the person you are banning is on a dynamic IP, then it will most likely change each time he resets his account. This will mean that someone else will be assigned that IP most likely and he will be unbanned. Then the new person (which is rare, I'll admit) will not now why he is banned. If you ban an entire IP block, be sure it's not something like some central hub as you may ban the entire network from coming to your site.
You can always do a whois with the IP address to find out who the IP block belongs to.
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