Instructions
Finding the MAC Address on the Original Xbox
Insert the Xbox Live disc into the system.
Select "Settings" and then "Network Settings."
Note the MAC address listed in the bottom-right corner of the screen.
Finding and Changing the MAC Address on Xbox 360
Select "System Settings" from the Dashboard.
Select "Network Settings" and then either "Wired Network" or "Wireless Network," depending on the type of connection you use.
Select "Configure Network," and then the "Additional Settings" tab.
Select "Advanced Settings." The system's current MAC address is listed on this page.
Select "Alternate MAC Address." Enter the MAC Address that you want to assign to the device.