macOS · System Info
Quickly find your exact macOS version for support calls
Clicking the macOS version number in About This Mac reveals the exact build number, useful when a support agent, developer, or compatibility check needs more precision than the marketing version name.
How to open macOS Version & Build Number
- Click the Apple menu and select About This Mac
- Click once on the macOS version number to reveal the build number
- Click again to reveal the hardware and software serial identifiers
What you should know
- The main About This Mac panel shows the marketing version, like macOS Sonoma 14.5
- Clicking the version number once reveals the build number
- Clicking again reveals the full hardware and software UUID
- Useful for filing bug reports or checking software compatibility requirements
Why it matters
Many support workflows and compatibility requirements ask for the exact build number rather than just the marketing version name, since two Macs running 'the same' macOS version can be on different build numbers if one hasn't installed the latest point update. This distinction matters most when troubleshooting a bug that was fixed in a specific point release, or when a developer's compatibility notes reference an exact build. It's a small but frequently needed piece of information that isn't obvious unless you know to click through.
Best practices
- Note the build number before contacting support so you don't need to look it up mid-call.
- Compare build numbers when troubleshooting an issue that behaves differently on two Macs running what looks like the same OS version.
- Keep macOS updated to the latest build within your version to ensure you have the newest security patches.
Common problems and fixes
- Can't find the build number anywhere obvious.
- It's hidden by design; click directly on the version number text in About This Mac to reveal it.
- Build number doesn't match what a compatibility guide expects.
- Run Software Update to install the latest point release for your macOS version.
Tips and tricks
- Hold Option while clicking the Apple menu to reveal a 'System Information' shortcut with even more detail than About This Mac.
Frequently asked questions
What does the build number look like?
It's a short alphanumeric code, such as 23F79, distinct from the version number like 14.5.
Do I need this for everyday use?
No, it's mainly useful for support requests, developer compatibility checks, and bug reports.
Related settings
- About This MacAbout This Mac (accessible from the Apple menu) shows your Mac's model, chip or processor, memory, macOS version, and serial number at a glance, plus a detailed system report and storage breakdown for deeper troubleshooting.
- Software UpdateSoftware Update in System Settings keeps macOS current with the latest security fixes, features, and app compatibility improvements. Regular updates help keep your Mac fast, stable, and protected.
- System ReportSystem Report (opened via the System Information app) provides a full technical inventory of your Mac — every connected device, installed application, network configuration, and hardware component — far beyond the summary shown in About This Mac. It's the tool Apple Support usually asks you to check when diagnosing hardware issues.
More System Info guides for macOS
- Date & TimeDate & Time settings keep your Mac's clock accurate by syncing automatically with a network time server, or let you set the date, time, and time zone manually when automatic detection isn't appropriate.
- Startup DiskStartup Disk lets you select which internal or external bootable volume your Mac uses when it powers on, useful if you have multiple macOS installations, a bootable backup, or a Windows partition via Boot Camp on an Intel Mac. Apple silicon Macs manage most of this through Startup Security Utility instead.
- Serial Number & CoverageThis is where you locate your Mac's serial number and check whether it's still covered by Apple's limited warranty or an AppleCare+ plan. You'll need the serial number for support calls, insurance claims, or verifying coverage before a repair.
- Sharing & Computer NameView and change the name your Mac uses on local networks and AirDrop, and manage which sharing services like File Sharing or Screen Sharing are enabled.
- Profiles (Device Management)See configuration profiles installed on your Mac by an employer, school, or manually, which can enforce settings like Wi-Fi configurations, restrictions, or MDM enrollment.
- Legal & RegulatoryThe Legal & Regulatory page contains the macOS software license agreement, open-source acknowledgments, and regulatory certification marks required for different countries and regions.