To find your Internet Protocol (IP) of your computer on your network, depending on your Operating System (OS) in this case Windows XP, Vista, or 7, follow these steps.
Windows XP
1. Click Start, Start Menu
2. Click Run
3. In the Run box, type "cmd" or "command prompt" without quotation marks then press return/enter on your keyboard.
4. When the Command Prompt (CMD) opens, type "ipconfig" and press return/enter on your keyboard.
Windows Vista & 7
1. Click Start, Start Menu
2. On the Start Menu, in the "search box" type "cmd" or "command prompt" without quotation marks.
3. Press return/enter OR with your mouse click on the result for "cmd" or "command prompt" which should open the Command Prompt (CMD).
4. In the Command Prompt type "ipconfig" without quotation marks. Then press return/enter on your keyboard.
The Command Prompt should pull up, load, your Internet Protocol configurations, hence the command, "ipconfig." Distinguish between which is your computers IP on your network and which one is the IP of your internet connection to the internet, to the World Wide Web (WWW), Default Gateway, WHATEVER YOU REFER TO IT AS.
To find the IP of your internet connection to the internet, to the WWW, however you refer to it as, simply visit
http://whatismyip.com/
NOTE: I do NOT intend on promoting the above operating system and website, rather I am sharing my knowledge and helping to resolve this question through the use of those resources.