An external IP address--short for "Internet Protocol address"--is a numerical identification code assigned to your computer by your Internet service provider whenever you connect to the Internet. The external IP address allows other computers on the Internet to identify your computer and communicate with it. You can find out what external IP address has been assigned to your computer by visiting many popular websites which display this information.
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Find Your IP Address Online
Launch your preferred Internet browser, such as Internet Explorer or Firefox.
Navigate to any of the following addresses: whatsmyip.org; ipaddress.org; whatismyipaddress.com. Links to these websites are provided in the "Resources" area.
Find your IP address, which will be displayed near the top of the page at the middle of the screen.