Finding your Mac OS X version and build number
From the Apple () menu, choose About This Mac.
The About This Mac window appears, showing your OS X version number.
In the above example, the version is 10.7 (OS X Lion).
To see the OS X build version, 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, 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 to view this information in the System Information dialog box.
OS X Lion, Mac OS X 10.6.x, 10.5.8
Note: Build 11B2118 is available only on the Mac mini (Mid 2011), Mac mini Server (Mid 2011), and MacBook Air (Mid 2011).
Retail installation discs
Mac OS X v10.5 and earlier builds
From the Apple () menu, choose About This Mac.
The About This Mac window appears, showing your OS X version number.
In the above example, the version is 10.7 (OS X Lion).
To see the OS X build version, 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, 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 to view this information in the System Information dialog box.
OS X Lion, Mac OS X 10.6.x, 10.5.8
| Software Update Build Numbers | |
| OS X Lion v10.7.2 | Build 11C74 |
| OS X Lion v10.7.1 | Build 11B26 or 11B2118 (see note) |
| OS X Lion v10.7 | Build 11A511 |
| Mac OS X v10.6.8 | Build 10K540 |
| Mac OS X v10.6.7 | Build 10J869 or 10J3250 |
| Mac OS X v10.6.6 | Build 10J567 |
| Mac OS X v10.6.5 | Build 10H574 or 10H575 |
| Mac OS X v10.6.4 | Build 10F569 or 10F616 |
| Mac OS X v10.6.3 | Build 10D573 or 10D578 |
Retail installation discs
| Retail 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 v10.5.4 Install DVD | Build 9E25 |
| Mac OS X v10.5 Leopard Install DVD | Build 9A581 |
Mac OS X v10.5 and earlier builds
| About This Mac "Build" Information | |
| 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 |
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