Instructions
Turn on your PlayStation 3 console and make sure the disc tray is empty.
Log in to your console and scroll through the PS3's menu until you reach the "Settings" option. Scroll down through the "Settings" sub-menu and highlight the "System Settings" option. Press the "X" button.
Scroll to the "System Information" option and press "X." Your PlayStation 3's IP address will be among the items in the "System Information" list.