Step 2: A window appears displaying information about the currently running Mac OS X. Step 1: Go to the Apple Menu and select About This Mac. You can use your current Mac Operating System to obtain this number. You have to note down this number for future reference.ĭidn’t do that? Not to worry, as finding Mac’s serial number these days is really easy. When you purchase a brand new Mac, the original package will have the product key (also called serial number) printed on it. Searching for the serial number of your iMac, MacBook Pro or Air?Įvery Mac machine comes with a unique product key.