You can use Google to quickly find your external IP address*. Simply enter “ip” as your search term in Google. You’ll receive something like this:
Your public IP address is the address that is seen by servers on the Internet. In most home / small office networking scenarios, the external IP address is actually assigned to your router and is used by all computers on the internal network when accessing the outside world.
For more information, see What is my IP? – Web Search Help.