PowerShell: Get Windows Build Number

Need to check the exact Windows build number for compatibility checks, feature availability, or troubleshooting an update issue? This one-liner pulls it straight from the OS.

Prerequisites:

• Privileges: None
• Module: Built-in, no import needed

Quick Command:

Get-CimInstance -ClassName Win32_OperatingSystem | Select-Object BuildNumber

Example Output:

BuildNumber
-----------
22631

How It Works:

• Get-CimInstance -ClassName Win32_OperatingSystem queries the operating system class through CIM/WMI, which holds core system details like version, architecture, install date, and build info.
• BuildNumber returns the specific Windows build (e.g. 22631 for a Windows 11 23H2 release), which is more precise than just the marketing version name and is often what you need to confirm a specific update or feature is present.
• Select-Object trims the output down to just this one property, since Win32_OperatingSystem also returns a lot more data (like Caption, Version, OSArchitecture, or InstallDate) that isn't needed for a quick build check.