It can't be that hard to do -- most IPs resolve to specific ISPs and such and can be resolved to a location. There's programs that will take an IP address and show you an aerial map of the neighborhood that IP address is coming from. All it'd have to do is figure out if the IP resolves to a square box around the US and if not, ban. Ah well, was just hoping there was something available, I see entirely no reason for anyone outside of the US to be browsing my site in the first place.
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