This is a wrapper around the GeoIP databases from MaxMind.

It also has a web API which automatically keeps the GeoIP database up-to-date. This is a very handy tool when you use e.g. a microservice approach and you don't want to keep a copy of the database for each microservice which needs GeoIP capabilities. By using the server approach, you can keep this functionality in a central place.

make build-server

make build-docker-image

PORT=8080 GEOIP_DB=testdata/GeoLite2-City.mmdb LICENSE_KEY=license ./geoip-server

The docker image automatically includes a copy of the GeoLite2-City.mmdb database.

docker run --rm pieterclaerhout/geoip-server

$ curl "http://localhost:8080/lookup?ip=1.1.1.1"
{
  "IPAddress": "1.1.1.1",
  "Continent": {
    "ISOCode": "OC",
    "Names": {
      "de": "Ozeanien",
      "en": "Oceania",
      "es": "Oceanía",
      "fr": "Océanie",
      "ja": "オセアニア",
      "pt-BR": "Oceania",
      "ru": "Океания",
      "zh-CN": "大洋洲"
    }
  },
  "Country": {
    "ISOCode": "AU",
    "Names": {
      "de": "Australien",
      "en": "Australia",
      "es": "Australia",
      "fr": "Australie",
      "ja": "オーストラリア",
      "pt-BR": "Austrália",
      "ru": "Австралия",
      "zh-CN": "澳大利亚"
    }
  },
  "Location": {
    "Latitude": -33.494,
    "Longitude": 143.2104,
    "TimeZone": "Australia/Sydney"
  },
  "Subdivisions": null,
  "IsCached": false
}

package main

import (
    "fmt"
    "os"
    "time"
    
    geoip "github.com/pieterclaerhout/go-geoip/v2"
)

func main() {

    client := geoip.NewClient("http://localhost:8080/  lookup", 5*time.Second)
  
    actual, err := client.Lookup("1.1.1.1")
    if err != nil {
        fmt.Println(err)
        os.Exit(1)
    }
  
    fmt.Printf("%v\n", actual)

}

To run the GeoIP server and use the automatic database download, you need to obtain a license key from MaxMind as explained here.

It's an easy and straightforward process:

1. Sign up for a MaxMind account (no purchase required)

2. Set your password and create a license key

3. Use the environment variable LICENSE_KEY to set the license key which needs to be used.