package main import ( "fmt" "log" "net/netip" "github.com/oschwald/maxminddb-golang/v2" ) func main() { db, err := maxminddb.Open("GeoLite2-City.mmdb") if err != nil { log.Fatal(err)	} defer db.Close() ip, err := netip.ParseAddr("81.2.69.142") if err != nil { log.Fatal(err)	} var record struct { Country struct { ISOCode string `maxminddb:"iso_code"` Names map[string]string `maxminddb:"names"`	} `maxminddb:"country"` City struct { Names map[string]string `maxminddb:"names"`	} `maxminddb:"city"`	} err = db.Lookup(ip).Decode(&record) if err != nil { log.Fatal(err)	} fmt.Printf("Country: %s (%s)\n", record.Country.Names["en"], record.Country.ISOCode) fmt.Printf("City: %s\n", record.City.Names["en"]) }

db, err := maxminddb.Open("GeoLite2-City.mmdb") if err != nil { log.Fatal(err) } defer db.Close() var record any ip := netip.MustParseAddr("1.2.3.4") err = db.Lookup(ip).Decode(&record)

type City struct { Country struct { ISOCode string `maxminddb:"iso_code"` Names struct { English string `maxminddb:"en"` German string `maxminddb:"de"`	} `maxminddb:"names"`	} `maxminddb:"country"` } var city City err = db.Lookup(ip).Decode(&city)

type FastCity struct { CountryISO string CityName string } func (c *FastCity) UnmarshalMaxMindDB(d *maxminddb.Decoder) error { mapIter, size, err := d.ReadMap() if err != nil { return err	} // Pre-allocate with correct capacity for better performance _ = size // Use for pre-allocation if storing map data for key, err := range mapIter { if err != nil { return err	} switch string(key) { case "country": countryIter, _, err := d.ReadMap() if err != nil { return err	} for countryKey, countryErr := range countryIter { if countryErr != nil { return countryErr	} if string(countryKey) == "iso_code" { c.CountryISO, err = d.ReadString() if err != nil { return err	}	} else { if err := d.SkipValue(); err != nil { return err	}	}	} default: if err := d.SkipValue(); err != nil { return err	}	}	} return nil }

// Iterate over all networks in the database for result := range db.Networks() { var record struct { Country struct { ISOCode string `maxminddb:"iso_code"`	} `maxminddb:"country"`	} err := result.Decode(&record) if err != nil { log.Fatal(err)	} fmt.Printf("%s: %s\n", result.Prefix(), record.Country.ISOCode) } // Iterate over networks within a specific prefix prefix := netip.MustParsePrefix("192.168.0.0/16") for result := range db.NetworksWithin(prefix) { // Process networks within 192.168.0.0/16 }

var countryCode string err = db.Lookup(ip).DecodePath(&countryCode, "country", "iso_code") var cityName string err = db.Lookup(ip).DecodePath(&cityName, "city", "names", "en")