The portal number (also known as port number or IP address) of the computer is a unique series of characters that represent your computer's "home" on the Internet. Other machines have to use this series of characters to access your machine. There are two different portal numbers that you should know--your "internal" address (the address that other computers on your home network use) and your "external" address.
Open the "Start" menu, click on "Run," type in "cmd," and press "Enter."
Type in "ipconfig" and press "Enter."
Look at the line titled "IPv4 Address." This is your computer's internal portal number.
Navigate to the What is My IP Address? website (see Resources). This number is your computer's external portal address.