From: Caesar Romano on
IP2 v1.04 - 8k zip download, is a small program that you can use to
determine your IP addresses - both WAN and LAN. What this means is
that along with showing you the traditional IP address that your
computer is using in its local environment (e.g. a LAN) it will also
show you what your IP address is from the perspective of an "outsider"
on the Internet. This is in contrast to the many tools and utilities
available on the Internet that simply return the LAN address, which is
useless if somebody on the Internet needs to connect to your computer.

Your WAN and LAN IP addresses may be the same if you are directly
accessing the Internet with something like a dialup modem or a cable
modem without a hardware NAT router. However, if you are using some
kind of hardware router or firewall as your gateway to the Internet,
your computer will most likely have been assigned a "non-routable" IP
address such as 10.1.2.3 or 192.168.1.2 for example. In this situation
there is no easy way to find out what your true Internet IP address
is. This is where IP2 comes into play.
http://keir.net/ip2.html
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