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Some don't, or it has rubbed off with use.

Some devices have their MAC addresses printed out on their shell, on a sticker, or under their battery. However, to be absolutely certain, you'll need to pair it and use it. The unique MAC address helps you a little in identifying which device is which. This is useful for connecting to other devices which are supposed to be locked to specific other devices (cable modems). Some devices allow you to change the MAC address advertised in software, for instance Ethernet adapters or wifi adapters. MAC addresses are generally unique to a device, but some manufacturers re-use MAC addresses within a particular model or part number. Dell has a range of MAC addresses that it uses, and Apple has another. There are several lookup tools on the web, such as or. This is called the OUI (organizationally unique identifier). MAC addresses can sometimes be used to identify the maker and potentially model of the device even without the device in hand.