Finding the home country of a client using only the IP address can be
difficult. Looking up the domain name associated with that address can provide
some help, but many IP addresses are not reverse mapped to any useful domain, and
the most common domain (.com) offers no help when looking for country.

This module comes bundled with a database of countries where various IP
addresses have been assigned. Although the country of assignment will probably
be the country associated with a large ISP rather than the client herself, this
is probably good enough for most log analysis applications, and under test has
proved to be as accurate as reverse-DNS and WHOIS lookup.