Check an iMac serial.
Enter an iMac serial and Macfax returns the exact model and year, including the randomized serials Apple has used since 2021. Every Apple Silicon iMac is the 24-inch design; the identifier table below tells the generations apart.
Find the serial on an iMac.
- On the chassis: printed on the underside of the stand's foot — tilt the screen up gently to read it.
- On any Mac that boots: Apple menu → About This Mac shows the serial.
- Off the machine: the original box carries it on the barcode label, and it appears on the Apple invoice.
- Buying one? Ask for a photo of About This Mac and one of the stand's underside, and check the two serials match.
Every Apple Silicon iMac.
Have a Model ID instead of a serial (from About This Mac or a listing)? This table maps it. The serial lookup above returns the same answer from the serial alone.
| Model ID | Chip | Year |
|---|---|---|
| iMac21,1 | M1 | 2021 |
| iMac21,2 | M1 | 2021 |
| Mac15,4 | M3 | 2023 |
| Mac15,5 | M3 | 2023 |
| Mac16,2 | M4 | 2024 |
| Mac16,3 | M4 | 2024 |
What sellers are asking.
Across 932 live asking prices, iMac listings run $741 to $1,200, typically $999. All configurations pooled; the per-configuration pages below carry the tighter bands.
What goes wrong with used iMac deals.
The M1, M3, and M4 iMacs share one 24-inch design and one set of listing photos; the serial is the only fast way to tell which generation is for sale.
Each generation ships two identifier variants (port count and GPU differ). The lookup returns the model; confirm ports and specs in About This Mac.
Buying or selling an iMac?
A serial names the model. A Macfax report proves the Mac in front of you is really that machine, in the condition claimed, hardware-signed and verifiable online.