If I understand the matter correctly, IP bans have the effect of locking out an entire section of IP's -- not just the IP held by the banned individual. You can block one IP address or a whole range of them. Some ISPs use a proxy address, so if you block that, you block huge portions of their users, though. And yes, if the person has a dynamic IP and you block a whole range to keep them out, you also keep out everyone else at that ISP. IP blocking is only genuinely effective in a reasonable way if the person you're trying to keep out has a static IP address. bonni

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