Learn how to find the serial number and other information that can help you identify your iMac.
Locate your serial number, model identifier, and part number
You can find the serial number and other identifiers for your iMac in macOS, on the computer’s surface, and on its packaging.
In the About This Mac window
With most versions of macOS, you can find your computer’s serial number and model information in the About This Mac window.
Choose Apple menu () > About This Mac. The window that appears lists your computer’s model name—for example, iMac (Retina 4K, 21.5-inch, Late 2015)—and serial number. You can then use your serial number to check your service and support options or to find tech specs for your model.
You can also use your computer’s model identifier to get more information. In the About This Mac window, click System Report. In the System Information window that opens, find Model Identifier in the Hardware Overview section. Then use the identifier to locate your iMac below.
On the surface of your iMac
The serial number of your iMac is printed on its surface. To find it, shut down your iMac and unplug any connected cables so you can safely move it. Then gently lay the computer face-down on a soft, clean towel or cloth.
The serial number is on the underside of the base (or foot) of the iMac, along with a bar code and regulatory markings. (See image below)
On the original product packaging or receipt
If you still have the original packaging for your iMac, you can find the serial number on a barcode label on the box.
The packaging also lists the Apple part number—for example, MK452xx/A. Match that number to one in the list below to find your iMac model. In Apple part numbers, the “xx” before the slash are variables that differ by country or region.
The serial number, model number, and configuration details of your iMac might also appear on its receipt or invoice.