How to find your computer serial number.
On Windows, open Command Prompt and run wmic bios get serialnumber. Where WMIC is missing, PowerShell does the same job. The commands for every system are below.
Copy the command for your computer.
Each command prints the serial number stored in the firmware. If it comes back blank or generic, check the label on the device, the BIOS/UEFI screen, or the purchase invoice.
Windows · Command Prompt
wmic bios get serialnumberThe serial is the value under SerialNumber. Current Windows 11 releases (24H2 and 25H2) no longer include WMIC; if Windows says wmic is not recognised, use PowerShell.
Windows · PowerShell
Get-CimInstance -ClassName Win32_BIOS | Select-Object SerialNumberWorks on Windows 10 and 11, including releases without WMIC.
macOS · Terminal
system_profiler SPHardwareDataType | grep SerialOr open the Apple menu and choose About This Mac.
Linux · Terminal
sudo dmidecode -s system-serial-numberNeeds administrator rights. Virtual machines may show a generic value.
Do not share passwords, personal files, confidential documents, or account access while sending a serial number for support. Share only the information needed to identify the device.
Find the serial number on Windows.
- Open Command Prompt: search for
cmdin the Start menu. - Type
wmic bios get serialnumberand press Enter. The value underSerialNumberis the serial. - If Windows says
wmicis not recognised, open PowerShell instead and runGet-CimInstance -ClassName Win32_BIOS | Select-Object SerialNumber. - If the result is blank or generic (for example “To be filled by O.E.M.”), 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 refurbished laptop warranty help, the serial number can reduce confusion and speed up triage.
Identifying the correct rental or purchased laptop
Checking warranty, service, repair, and support context
Tracking returns, pickups, replacements, and logistics handoffs
Avoiding confusion when multiple similar devices are used by a team
Looking up serials one machine at a time is the job, not the answer.
A single serial number takes one command. A shelf of them takes an afternoon, and the list is out of date the next time a device changes hands. That is usually the real problem behind this search: not the command, but keeping track of which machine is where and who has it.
Laptops rented from SPURGE come with the client panel at no extra cost. Each device carries a QR code, the record updates as devices are delivered, returned or replaced, and the whole list exports to a sheet in one click — so nobody types a serial number into a spreadsheet twice.
See how the client panel worksWhere to go once you have the serial number.
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.