Check the backside of the MacBook for a five digit number starting with the letter A.
SYSTEM INFORMATION
1. Press and hold the Option key on your keyboard while choosing Apple menu > System Information from the menu bar.
2. Select Hardware in the sidebar.
3. Find the model name and serial number on the right.
You can also have System Information read your serial number aloud. From the menu bar in System Information, choose File > Speak Serial Number. Or press Command-4.
PRODUCT or PACKAGING
Look for the serial number printed on your Mac or its original packaging. For details, see the product-ID page for MacBook Pro, MacBook Air, MacBook
appleid.apple.com
1. Sign in to appleid.apple.com.
2. Click Devices in the sidebar.
3. If your Mac is listed on the right, click its name to see its model name and serial number.
Terminal
1. Open the Terminal app, which is in the Utilities folder of your Applications folder.
2. Type or paste this command in Terminal: system_profiler SPHardwareDataType
3. Press Return to enter the command. Terminal then shows a hardware overview that includes the model name and serial number.
