You may use the Microsoft Windows PowerShell script below to get the service tag of a Dell server, remotely.

<#
.SYNOPSIS
This script will automate the process of determining the service tag of a Dell server.
.DESCRIPTION
This script will query the server you specificy for it’s service tag.
.EXAMPLE
wmic /user:administrator /node:hostname bios get serialnumber.
.AUTHOR
Written by Noel Enrique Alvarez on Monday, December 05, 2016.
#>

#Request the domain name
$USERNAME = Read-Host “What is the username of the administrator account?”

#Request the hostname of the server
$HOSTNAME = Read-Host “What is hostname of the server?”

#Get the service tag
wmic /user:$USERNAME /node:$HOSTNAME bios get serialnumber

#End of script