Go to the "Apple" menu and select the "System Preferences" option. Click "Print & Fax" from the menu.
Select the printer from the menu on the left and press the "Open Print Queue" button.
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Open the "Printer" menu at the top of the screen and select "Print Test Page."
Go to the "Device URI" on the CUPS text page and look towards the end of the string. The IP address appears after "IP=."