Geo-IP

Evaluation of the location of a given IP address
The country of an IP address can be identified, anonymous proxies will be shown separately and transparent proxies, if known, as well.
It is possible to query the city matching the IP address; but only (depending on the country) with the certainty level between 50 and 80%.
That way you know, before the customer tells you something about himself, with quite good sureness where he comes from and can also determine the region within his country of origin.
Why should you offer a product to an American customer on prominent position which is more interesting for the European market?