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GO Lib GeoIP API for Maxmind

branch: master

General Description

This is the Go implementation of the Maxmind GeoIP API. It is incomplete and work in progress the initial goal is support only two of the database types – the City Lite and Country Lite. The only supported method is loading the full db on startup into memory (memory cache).

Supported Access Methods

  • In Memory (Load(string))

Supported Database Formats

  • Country Edition (dbType=1)
  • City Edition REV 0 (dbType=6)
  • City Edition REV 1 (dbType=2)

Supported Lookups

  • By IP Address (GetLocationByIP(string))
  • By IP Number (GetLocationByIPNum(uint32))

Supported Responses

  • CountryCode string (available in all databases)
  • CountryName string (available in all databases)
  • City string
  • Region string
  • PostalCode string
  • Latitude float32
  • Longitude float32

To Do

  • Implement better error handling (report the error on load and lookups)
  • Better returns, country edition has only code and name (perhaps use interfaces)
  • Add test cases and benchmarking
  • Add support for more database formats


make (See Makefile for more details)


./example DBFILE IPADDRESS (i.e. ./example GeoIP.dat


Please see example.go for a complete example of how to use this library.

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