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How to Identify Which Operating System Your PC Is Running

Check the operating system currently running on your Windows PC, Mac or Linux computer, and find the version or build details support may ask for.
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On Windows 10 or 11, open Start > Settings > System > About and check Edition, Version and, if needed, OS Build under Windows specifications. If you use a Mac or Linux computer, follow the clearly labeled steps below—the make or appearance of a computer does not by itself tell you which operating system is currently running.

Find your Windows edition and version

  1. Open Start > Settings > System > About.
  2. Under Windows specifications, read the Edition and Version. Record OS Build too if a support request asks for it. Microsoft documents this route and other ways to check Windows details in its Windows version guide.
  3. For a compact dialog, search for winver from Start or open Run and enter it. For fuller system information, run msinfo32. Microsoft also documents systeminfo | findstr /B /C:"OS Name" /B /C:"OS Version" in Command Prompt.

Check whether Windows is 32-bit or 64-bit

In Settings > System > About, look under Device specifications for System type. This is architecture information, not the Windows edition or release. Microsoft states that Windows 11 is 64-bit only; see its 32-bit and 64-bit Windows FAQ.

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Check the macOS version on a Mac

  1. Choose the Apple menu.
  2. Open System Settings > General > About. Depending on the macOS interface and version, the route may instead appear as About This Mac.
  3. Read the macOS entry. Click the displayed version number to reveal the exact version. Apple explains the About screen in View About settings on Mac.

For a more detailed technical inventory, open System Report from About. Apple describes that option in Get system information about your Mac.

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Identify a Linux distribution and release

  1. Open a terminal.
  2. Run cat /etc/os-release.
  3. Read PRETTY_NAME, NAME and VERSION_ID to identify the distribution and release. The file may also include ID and VERSION. The Linux os-release manual documents these identification fields.

On a system using systemd, hostnamectl can show a readable system overview; its availability and output depend on the environment. The hostnamectl manual describes the command. For identifying a Linux distribution release, prefer the distribution values in /etc/os-release over a kernel-only result. Some distributions, including rolling-release distributions, may deliberately omit VERSION_ID.

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Know which details to give support

First check what the support form or technician actually requests. Operating-system identity, release or build, and architecture are different details; a kernel version alone does not name a Linux distribution release.

  • Windows: Give the edition and version; include OS Build if requested. Include System type only when asked whether Windows is 32-bit or 64-bit.
  • Mac: Give the macOS version. Use System Report only if support needs more technical inventory.
  • Linux: Give the distribution name and release from /etc/os-release, rather than a kernel-only string.

If more than one operating system is installed, report the one currently booted. If you are using a virtual machine, identify the guest operating system when the question is about the environment inside that virtual machine.

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