How to Determine your IP address for Xbox Live
This walk-through video tutorial shows you how to find out your IP address for XBox live. First press the start button and search for run as shown, click the result, bring up the dialog and type in the given command to open the command prompt window. Type the command in the given window and hit enter. The number that appears is your IP address, use it as the key for XBox Live. In the case of XBox 360, it automatically detects it.