How to find your computer serial number.
Use this quick guide to find a laptop or computer serial number on Windows, macOS, and Linux before sharing a support, repair, warranty, rental, or logistics request.
The serial number is usually in system settings, BIOS/UEFI, device labels, or original documentation.
On Windows, use Command Prompt. On macOS, use About This Mac. On Linux, use Terminal with dmidecode where available. If software tools do not show the serial number, check the physical label or purchase documents.
Image slots for serial number examples.
Screenshots for Windows, macOS, and Linux serial-number locations can be added here later. Placeholder examples help users identify the right label, system settings screen, or command output before contacting support.
Find the serial number on Windows.
- Open Command Prompt from the Start menu.
- Type: wmic bios get serialnumber
- Press Enter and copy the serial number shown under SerialNumber.
- If the result is blank or generic, check the device label, BIOS/UEFI screen, invoice, or manufacturer support app.
Find the serial number on a MacBook or Mac.
- Click the Apple menu in the top-left corner.
- Choose About This Mac.
- Copy the serial number shown in the overview window.
- You can also check the device underside, original packaging, invoice, or Apple account device list if available.
Find the serial number on Linux.
- Open Terminal.
- Run: sudo dmidecode -s system-serial-number
- Enter the administrator password if prompted.
- If the value is missing, check BIOS/UEFI, the device label, invoice, or manufacturer support tooling.
Serial numbers help support teams identify the exact device.
If you are requesting laptop service and repair, replacement, return pickup, rental support, or renewed laptop warranty help, the serial number can reduce confusion and speed up triage.
Need help after finding the serial number?
Send the serial number, device model, issue, city, urgency, and whether the device was rented or purchased through SPURGE.