IP::Country::DB_File is a light-weight module for fast IP address to
country translation based on DB_File. The country code database is
stored in a Berkeley DB file. You have to build the database using
build_ipcc.pl or IP::Country::DB_File::Builder before you can lookup
country codes.

This module tries to be API compatible with the other IP::Country
modules. The installation of IP::Country is not required.