Obtain Service Tag

Obtain Service Tag remotely with command line

wmic /user:administrator /node:remote-host bios get serialnumber

You will be prompted for the password for account administrator.

NOTE :: type the command exactly like it appears above only replacing the remote-host part with the workstations name or IP address you're querying. If you want to use a user account other than administrator, replace 'administrator' with the account you wish to use.

Obtain Service Tag 

locally with command line

In the command prompt type the following and press Enter/Return. wmic csproduct get vendor,name,identifyingnumber