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Perhaps the easiest to install, since most distributions package these.

Note that Geo::IP updates are discontinued since April 2018, so you should use the new GeoIP2 (MMDB) databases. Free and commercial versions can be found from several vendors:

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

https://db-ip.com/db/lite.php

Note about IP::Country::DB_File

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