11-05-2021

Grid Mac Serial Number

Your Mac provides several tools to help you identify it. The simplest is About This Mac, available by choosing About This Mac from the Apple () menu in the upper-left corner of your screen. The other is the System Information app. Learn how to use these tools to identify your Mac.

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If you don’t have your Mac or it doesn’t start up, use one of these solutions instead:

Find the serial number printed on the underside of your Mac, near the regulatory markings. It’s also on the original packaging, next to a barcode label. You can then enter that serial number on the Check Coverage page to find your model.
The original packaging might also show an Apple part number, such as MMQA2xx/A (“xx” is a variable that differs by country or region). You can match the Apple part number to one in the list below to find your model.

List of iMac models

iMac models are organized by the year they were introduced, starting with the most recent. Click the model name for detailed technical specifications.

iMac models from 2012 and newer can run the latest version of macOS. For models from before 2012, the latest compatible operating system is noted.

2019

iMac (Retina 5K, 27-inch, 2019)
Model Identifier: iMac19,1
Part Numbers: MRQYxx/A, MRR0xx/A, MRR1xx/A
Tech Specs: iMac (Retina 5K, 27-inch, 2019)

iMac (Retina 4K, 21.5-inch, 2019)
Model Identifier: iMac19,2
Part Numbers: MRT3xx/A, MRT4xx/A
Tech Specs: iMac (Retina 4K, 21.5-inch, 2019)

2017

iMac (Retina 5K, 27-inch, 2017)
Model Identifier: iMac18,3
Part Numbers: MNE92xx/A, MNEA2xx/A, MNED2xx/A
Tech Specs: iMac (Retina 5K, 27-inch, 2017)

iMac (Retina 4K, 21.5-inch, 2017)
Model Identifier: iMac18,2
Part Numbers: MNDY2xx/A, MNE02xx/A
Tech Specs: iMac (Retina 4K, 21.5-inch, 2017)

iMac (21.5-inch, 2017)
Model Identifier: iMac18,1
Part Numbers: MMQA2xx/A
Tech Specs: iMac (21.5-inch, 2017)

2015

iMac (Retina 5K, 27-inch, Late 2015)
Model Identifier: iMac17,1
Part Numbers: MK462xx/A, MK472xx/A, MK482xx/A
Tech Specs: iMac (Retina 5K, 27-inch, Late 2015)

iMac (Retina 4K, 21.5-inch, Late 2015)
Model Identifier: iMac16,2
Part Numbers: MK452xx/A
Tech Specs: iMac (Retina 4K, 21.5-inch, Late 2015)

iMac (21.5-inch, Late 2015)
Model Identifier: iMac16,1
Part Numbers: MK142xx/A, MK442xx/A
Tech Specs: iMac (21.5-inch, Late 2015)

iMac (Retina 5K, 27-inch, Mid 2015)
Model Identifier: iMac15,1
Part Numbers: MF885xx/A
Tech Specs: iMac (Retina 5K, 27-inch, Mid 2015)

2014

iMac (Retina 5K, 27-inch, Late 2014)
Model Identifier: iMac15,1
Part Number: MF886xx/A
Tech Specs: iMac (Retina 5K, 27-inch, Late 2014)

iMac (21.5-inch, Mid 2014)
Model Identifier: iMac14,4
Part Number: MF883xx/A, MG022xx/A
Tech Specs: iMac (21.5-inch, Mid 2014)

2013

iMac (27-inch, Late 2013)
Model Identifier: iMac14,2
Part Number: ME086xx/A, ME088xx/A
Tech Specs: iMac (27-inch, Late 2013)

iMac (21.5-inch, Late 2013)
Model Identifier: iMac14,1
Part Number: ME086xx/A, ME087xx/A
Tech Specs: iMac (21.5-inch, Late 2013)

2012

iMac (27-inch, Late 2012)
Model Identifier: iMac13,2
Part Number: MD095xx/A, MD096xx/A
Tech Specs: iMac (27-inch, Late 2012)

iMac (21.5-inch, Late 2012)
Model Identifier: iMac13,1
Part Number: MD093xx/A, MD094xx/A
Tech Specs: iMac (21.5-inch, Late 2012)

2011

iMac (27-inch, Mid 2011)
Model Identifier: iMac12,2
Part Number: MC813xx/A, MC814xx/A
Newest compatible operating system: macOS High Sierra 10.13.6
Tech Specs: iMac (27-inch, Mid 2011)

iMac (21.5-inch, Mid 2011)
Model Identifier: iMac12,1
Part Number: MC309xx/A, MC812xx/A
Newest compatible operating system: macOS High Sierra 10.13.6
Tech Specs: iMac (21.5-inch, Mid 2011)

2010

iMac (27-inch, Mid 2010)
Model Identifier: iMac11,3
Part Number: MC510xx/A, MC511xx/A
Newest compatible operating system: macOS High Sierra 10.13.6
Tech Specs: iMac (27-inch, Mid 2010)

iMac (21.5-inch, Mid 2010)
Model Identifier: iMac11,2
Part Number: MC508xx/A, MC509xx/A
Newest compatible operating system: macOS High Sierra 10.13.6
Tech Specs: iMac (21.5-inch, Mid 2010)

2009

iMac (27-inch, Late 2009)
Model Identifier: iMac10,1
Part Number: MB952xx/A, MB953xx/A
Newest compatible operating system: macOS High Sierra 10.13.6
Tech Specs: iMac (27-inch, Late 2009)

iMac (21.5-inch, Late 2009)
Model Identifier: iMac10,1
Part Number: MB950xx/A, MC413xx/A
Newest compatible operating system: macOS High Sierra 10.13.6
Tech Specs: iMac (21.5-inch, Late 2009)

iMac (24-inch, Early 2009)
Model Identifier: iMac9,1
Part Number: MB418xx/A, MB419xx/A
Newest compatible operating system: OS X El Capitan 10.11.6
Tech Specs: iMac (24-inch, Early 2009)

iMac (20-inch, Early 2009)
Model Identifier: iMac9,1
Part Number: MB417xx/A, MC019xx/A
Newest compatible operating system: OS X El Capitan 10.11.6
Tech Specs: iMac (20-inch, Early 2009)

Over the multitude of years of service, my 2009 Mac Pro has endured many supported and unsupported software updates, OS upgrades, hardware upgrades, firmware upgrades, re-installs, wipes, Boot Camp installs, boot loader changes, and so on and so on. Over that time and over those many changes, at some point, my logic board lost its marbles and simply 'forgot' its serial number. Here's how to get your Mac to 'remember' its serial number once more!

The problem with not having a serial number

For quite some time I had no issues with my Mac not knowing its serial number or revision (year of manufacture). Everything worked fine. I could install programs, log into the App store, iMessage friends and colleagues, and everything else needed in my Mac environment. However, a time came after a certain update or upgrade (I can't remember which, since for the most part, everything still just worked) certain services like iMessage and FaceTime would no longer allow me to log in to their services. Strangely some other services logged in just fine.

Words of warning

You really shouldn't do this fix. Seriously. Don't do it. But if you are insisting on getting it done there are a few caveats before delving into this fix.

First, you not only need a valid serial number, but you need a valid serial number for the hardware you will be performing it on. The serial number CAN'T be transferred between machines. Therefore this fix is truly for your genuine Apple hardware that has lost it's serial number along the way on its logic board. You'll be using the same serial number that the computer originally had when you first purchased it.

Second, there is no room for error. You only get one chance at inputting the proper serial number during the 'write' phase of the how to. If you mistype any part of it, you'll likely end up with a non-bootable system. DO NOT PERFORM THIS FIX IF YOU CANNOT LIVE WITH A NON-WORKING MACHINE.

Third, and most importantly, I'll be suggesting (but not providing) software that may or may not be for Apple's internal use only. I do not know the legality of having access to this software or using this software. Do not use this software if you worry about the copyright or legal issues that may or may not be involved with running said software.

Fourth, If this doesn't work for you and you get a non-functional system. Don't blame us. I told you to not perform this fix.

Fifth, if you have an Apple warranty that's still valid, call Apple to fix the serial number issue. Don't use this method. This will likely void any valid warranty.

Finally, don't use this fix.

Get your serial number

Getting your serial number should be a straight forward affair. When you buy your Apple for Apple.com, you'll get a receipt via email with your serial number on it. The box that your Mac came in will also have a serial number on a card within the box. You Mac itself, will have the same serial number somewhere either on, in, in back of, or under its casing. There is literally very little excuse for you to not have access to your serial number.

Get a USB key

For this to work, you'll need to be able to boot off of a secondary device such as a USB. the files are very small so nearly any USB key will work. I used the Cruzer from SanDisk from Amazon for $15 in my example.

Get the software

The software I'm using but am not providing is called the Blank Board Serializer.

The fix

Mac Serial Number Model

Format the USB drive with Disk Utility with the FAT filesystem.
Unpack the Blank Board Serializer program to your disk.
Using Disk Utility, Restore the unpacked dmg file to your USB drive.
Click Done.
Shutdown your Mac.
Reboot your Mac whilst holding the option key on your keyboard.
You'll be presented with multiple boot devices, choose the EFI USB key.
Click to Accept the usage agreement. See warnings above.
Enter your Serial Number WITHOUT ERRORS. Truly make certain there are no errors here. Remember that Zeros (0) and 'O's' look very similar.
Click Enter.
Click Yes for each following prompt.
Click Proceed.
Click Restart.
Done!

Final comments

Why was I able to log in to all of my services before the unknown update is anybody's guess. Is it because Apple wants only genuine Apple computers accessing their networks? If so then why would some iCloud services work whilst others didn't? In any case, Once a valid serial number was re-installed on my logic board, everything worked as seamlessly and as beautifully as expected. What about you? Are you living with no serial number? How has it affected you? Let us know in the comments!

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