There are those times you need the service tag from a system such as a noteboot, server, or pc and just can’t get to it.  Or… taking the “I’m not getting up for this method”.

Using the Windows Management Instrumentation Command-line (WMIC) you can pull this information right from the command prompt. Simply type the following:

wmic bios get serialnumber

You can also do something similar in Linux..  In my case I use Ubuntu and type:

dmidecode -s system-serial-number

Please note that in both systems you may need to elevate your rights to issues these commands.