GeoIP 有償版と無償版あり。 有償版は高精度、更新頻度高。 CSV形式で利用できるので、便利。 Digital Element NetAcuity 国レベルで90%、都市レベルで94%の精度。 http://itpro.nikkeibp.co.jp/article/NEWS/20080627/309686/ SURFPOINT（国内向け） 日本国…

The invention provides for conversion of latitude and longitude to an addressing scheme that supports current TCP/IP (Ipv4) and future addressing (Ipv6/Ipng) requirements. More specifically, it allows a decentralization of the unicast poin…

Investigating the Imprecision of IP Block-Based Geolocation