Finding your Mac OS X version and build information
Summary
Learn how to find your Mac OS X version and build information. This information may be helpful when updating software or the operating system on your Mac.
Products Affected
Mac OS X 10.0, Mac OS X 10.1, Mac OS X 10.2, Mac OS X 10.3, Mac OS X 10.4, Mac OS X 10.5, Mac OS X 10.6, OS X Lion, OS X Mountain Lion
Finding your OS X version and build number
From the Apple () menu, choose About This Mac. The About This Mac window shows your OS X version number.
In the above example, OS X Mountain Lion is installed.
To see the OS X build number, click the word "Version" in the About This Mac window. Clicking "Version" toggles you through the version, build, and serial number information for your Mac.
The build number depends on the version of the OS X operating system that you have installed. When you install an OS X system software update or upgrade, you get a new build number. The build number of OS X that ships with a Mac may be different than what appears below.
You can also access the OS X version and build number from System Information. In the About This Mac window, click More Info.
OS X Mountain Lion and Lion
| OS X build numbers | |
| OS X Mountain Lion v10.8.2 | Build 12C54 or 12C60 (see notes) |
| OS X Mountain Lion v10.8.1 | Build 12B19 |
| OS X Mountain Lion | Build 12A269 |
| OS X Lion v10.7.5 | Build 11G56 or 11G63 (see notes) |
| OS X Lion v10.7 | Build 11A511 |
Notes
- If you have Mountain Lion v10.8.2 (build 12C54), the OS X v10.8.2 Supplemental Update 1.0 can be installed to get OS X v10.8.2 (build 12C60).
- If you have OS X Lion v10.7.5 (build 11G56), the Mac OS X v10.7.5 Supplemental Update can be installed to get OS X v10.7.5 (build 11G63).
Mac OS X v10.6 and earlier builds
| OS X build numbers | |
| Mac OS X v10.6.8 | Build 10K540 or 10K549 |
| Mac OS X v10.5.8 | Build 9L30, or 9L34 for Server 10.5.8 v1.1 |
| Mac OS X v10.4.11 | Build 8S165 |
| Mac OS X v10.4 Tiger installation disc | Build 8A428 |
| Mac OS X v10.3.9 | Build 7W98 |
| Mac OS X v10.3.2 installation disc | Build 7D28 |
| Mac OS X v10.3 Panther installation disc | Build 7B85 |
| Mac OS X v10.2.8 | Build 6R65 or 6R73 |
| Mac OS X v10.2.3 installation disc | Build 6G37, 6G35 for Server |
| Mac OS X v10.2 Jaguar installation disc | Build 6C115 |
| Mac OS X v10.1.5 | Build 5S60 (5S66 with Networking Update 1.0) |
| Mac OS X v10.1 Puma installation disc | Build 5G64 (5L14 or 5L17b with Security Update 10-19-01) |
| Mac OS X v10.0 Cheetah installation disc | Build 4K78 |
Retail installation disc build numbers
| Mac OS X v10.6.3 Install DVD | Build 10D575 |
| Mac OS X v10.6 Snow Leopard Install DVD | Build 10A432, build 10A433 for Server |
| Mac OS X v10.5.6 Install DVD | Build 9G66 |
| Mac OS X v10.5 Leopard Install DVD | Build 9A581 |
Additional Information
You should always use the latest version of OS X. You can get updates from the Mac App Store (in Mountain Lion), Software Update pane of System Preferences, or from Apple Support Downloads. To find build numbers for specific Mac computers, refer to OS X versions (builds) for computers.
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