How to Find a WAN Address
WAN is an abbreviation for the "wide area network" that is the same as the Internet. Each computer connected to the Internet has is a unique numeric IP address (WAN address) written in the dot-decimal form (e.g. 18.104.22.168). However, IP addressing within a local area network (LAN) is more complicated. LAN consists of a few computers within a limited area connected to the Internet via a router. The router assigns internal IP addresses to LAN computers that are different from their respective WAN addresses.
If You're Correctly Connected to the Internet
Log on to a user account in Windows Vista/XP.
Click "Start" in the left lower corner of the screen.
if you use Windows XP, click "Run." Skip this step if you use Windows Vista.
Type "cmd" and press "Enter" to open a command prompt window.
Type "ipconfig" and press "Enter."
In the program output find the line starting with "IPv4 Address" and read the WAN IP address. For example, "IPv4 Address .....22.214.171.124"
If You're Connected to the Internet via a Router
Login to a user account in Windows Vista/XP.
Open a web browser and navigate to the "My IP address" website using the link in Resources.
Read the WAN IP address in the top of the page. For example: "Your IP Address Is: 126.96.36.199."