GeoLite2 Free Downloadable Databases « Maxmind Developer Site

http://dev.maxmind.com/geoip/geoip2/geolite2/

GeoLite2 databases are free IP geolocation databases comparable to, but less accurate than, MaxMind’s GeoIP2 databases. GeoLite2 databases are updated on the first Tuesday of each month.

IPアドレスと国名、街の名前、経度・緯度のデータベース。