Look on the outside of your Mac, or check the original packaging, receipt, or invoice as described on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, or Mac Pro. Sign in to appleid.apple.com, then look for your Mac in the Devices section. If you see your Mac there, click its name to see the model name and serial number. How is Mac Serial Junkie (web repository of Mac software registration data) abbreviated? MSJ stands for Mac Serial Junkie (web repository of Mac software registration data). MSJ is defined as Mac Serial Junkie (web repository of Mac software registration data) very rarely. The other is the System Information app. Find out how to use these tools to identify your Mac. 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 underneath of your Mac, near the regulatory markings. It's also on the original packaging, next to the barcode label.

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 top left-hand corner of your screen. The other is the System Information app. Find out how to use these tools to identify your Mac.

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 underneath of your Mac, near the regulatory markings. It's also on the original packaging, next to the barcode label. You can then enter that serial number on the Check Coverage page to find your model.
• The original packaging may 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 on the list below to find your model.

List of iMac models

iMac models are organised by the year when they were introduced, starting with the most recent. Click the model names to get detailed technical specifications or to view the accompanying user guide.

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

2020

iMac (Retina 5K, 27-inch, 2020)
Model Identifier: iMac20,1, iMac20,2
Part Numbers: MXWT2xx/A, MXWU2xx/A, MXWV2xx/A
Tech Specs: iMac (Retina 5K, 27-inch, 2020)
User Guide: iMac (Retina 5K, 27-inch, 2020)

2019

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

iMac (Retina 4K, 21.5-inch, 2019)
Model Label: iMac19,2
Part Numbers: MRT3xx/A, MRT4xx/A, MHK23xx/A
Tech Specs: iMac (Retina 4K, 21.5-inch, 2019)
User Guide: iMac (Retina 4K, 21.5-inch, 2019)

2017

iMac Pro
Model Label: iMacPro1,1
Part Numbers: MQ2Y2xx/A, MHLV3xx/A
Tech Specs: iMac Pro (2017)
User Guide: iMac Pro (2017)

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

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

iMac (21.5-inch, 2017)
Model Label: iMac18,1
Part Numbers: MMQA2xx/A, MHK03xx/A
Tech Specs: iMac (21.5-inch, 2017)
User Guide: iMac (21.5-inch, 2017)

2015

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

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

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

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

2014

iMac (Retina 5K, 27-inch, Late 2014)
Model Label: iMac15,1
Part Numbers: MF886xx/A
Tech Specs: iMac (Retina 5K, 27-inch, Late 2014)
User Guide: iMac (Retina 5K, 27-inch, Late 2014)

iMac (21.5-inch, Mid 2014)
Model Label: iMac14,4
Part Numbers: MF883xx/A, MG022xx/A
Tech Specs: iMac (21.5-inch, Mid 2014)
User Guide: iMac (21.5-inch, Mid 2014)

2013

iMac (27-inch, Late 2013)
Model Label: iMac14,2
Part Numbers: ME086xx/A, ME088xx/A
Tech Specs: iMac (27-inch, Late 2013)
User Guide: iMac (27-inch, Late 2013)

iMac (21.5-inch, Late 2013)
Model Label: iMac14,1
Part Numbers: ME086xx/A, ME087xx/A
Tech Specs: iMac (21.5-inch, Late 2013)
User Guide: iMac (21.5-inch, Late 2013)

2012

iMac (27-inch, Late 2012)
Model Label: iMac13,2
Part Numbers: MD095xx/A, MD096xx/A
Tech Specs: iMac (27-inch, Late 2012)
User Guide: iMac (27-inch, Late 2012)

iMac (21.5-inch, Late 2012)
Model Label: iMac13,1
Part Numbers: MD093xx/A, MD094xx/A
Tech Specs: iMac (21.5-inch, Late 2012)
User Guide: iMac (21.5-inch, Late 2012)

2011

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

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

2010

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

Macserialjunkie

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

Macserialjunkie Down

2009

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

Mac Serial Junkie Downloads

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

Mac Serial Junkie

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

Mac Free

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