How to Find Your Computer’s BIOS Serial Number: A Guide for Windows, macOS, and Linux Users

For Windows

1. Using the Command Prompt:
   • Open the Command Prompt by typing cmd in the search box.
   • Type the command wmic bios get serialnumber and press Enter. This command queries the Windows Management Instrumentation (WMI) to get the BIOS serial number.
2. Using PowerShell:
   • Open PowerShell by typing powershell in the search box.
   • Enter the command Get-WmiObject win32_bios | select SerialNumber and press Enter. This PowerShell command also uses WMI to retrieve the BIOS serial number.

For macOS

1. Using the Terminal:
   • Open the Terminal application.
   • Type the command ioreg -l | grep IOPlatformSerialNumber and press Enter. This command searches the I/O Registry for the property IOPlatformSerialNumber, which contains the BIOS serial number.

For Linux

1. Using the Terminal:
   • Open a terminal window.
   • Type the command sudo dmidecode -s system-serial-number and press Enter. This command uses the dmidecode utility to access the system’s DMI (Desktop Management Interface) table to find the serial number.
2. Checking /sys/class/dmi/id/product_serial file:
   • Some systems expose the BIOS serial number directly in the filesystem. You can check this by typing cat /sys/class/dmi/id/product_serial in the terminal.

These methods should cover most modern operating systems and provide you with the BIOS serial number. Note that on some systems, especially laptops, the BIOS serial number might be the same as the system serial number. Additionally, in some cases, the BIOS serial number might not be available due to hardware limitations or privacy settings in the BIOS/UEFI firmware.