Q: How do I determine the serial number of a computer?

Answer

Windows

Open a command prompt (by choosing the Command Prompt item from the Start menu, or typing cmd in the Start menu's "Run" box), and type the following:

wmic bios get serialnumber

Note: Windows 10 users may navigate to the Command Prompt by right clicking on Start button, or by typing "cmd" on Start screen to search it.

Related Supported Vendor links "How to find Serial Number or Service Tag" :

Dell how to find Service Tag

Lenovo how to find Serial Number

Mac OS X

Go to Utilities. Open the Terminal application and type:

ioreg -l | grep IOPlatformSerialNumber

With the release of macOS Ventura (Version 13), to find this information outside of the above, there are now two separate ways to find your serial number:

If you are running a version of macOS before Ventura - instructions can be found in Apple Support Article How To Find Apple Serial Number

If you are using a machine running macOS Ventura (Version 13) - instructions can also be found in MIT Knowledge Base article How to Find Serial number on An Apple Computer running macOS Ventura or Higher

Linux

Open a shell and type:

sudo dmidecode -t system | grep Serial

Note: The user will need to have root access to the system.