You might need the serial number when you register your Apple TV or request support.
Check the About screen
To see the serial number for your Apple TV, choose Settings > General > About. You can also see the serial number for your Siri Remote or Apple TV Remote* by choosing Settings > Remotes and Devices > Bluetooth > Remote.
If you still haven't found the number that you need, check your device or box.
Check the bottom of your Apple TV
To see the serial number on your device, check the information label on the bottom of your Apple TV.
Check the box
If you have your device's original box, you can see the serial number on the barcode.
*Apple TV (4th generation) ships with the same remote everywhere. In countries and regions that support Siri, the remote is called Siri Remote. Elsewhere, it’s called Apple TV Remote. Siri works on either remote as long as your Apple TV (4th generation) is set up with a language and country that supports Siri.