How to know your pc/laptop serial number The wmic bios get serialnumber command is a useful tool for retrieving the serial number of your computer directly from the BIOS. This command leverages the Windows Management Instrumentation Command-line (WMIC) tool to access system information stored in the BIOS. To use it, open Command Prompt or PowerShell, type wmic bios get serialnumber, and press Enter. The serial number will be displayed, which can be essential for warranty services, support, or in