Hostip.info is a community-based project to geolocate IP addresses, making the database freely available but it needs you to put in your city to make it work. Available as a Firefox plug-in, or embeddable in your website.
Our API directory now includes 48 IP APIs. The newest is the konvert.me API. The most popular, in terms of mashups, is the Hostip.info API. We list 18 Hostip.info mashups. Below you'll find some more stats from the directory, including the entire list of IP APIs.