Maybe there are less webmasters using GeoIP here than I had assumed.
GeoIP takes the first three octets of a website visitor's IP address, and checks it against an insternal database to figure what country or part of the country that visitor is coming from.
You can use scripts to detect and redirect, or even to target banners to the traffic.
I'm sure you've all seen the exit or logout page on Yahoo where the banner to the right advertises some utility company specific to your state or even your city...
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