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The service tag is unique to your system - it is essentially the serial number. If you don't have it recorded, but have your system registered with Dell (or purchased it direct from Dell), you should be able to obtain it by calling customer service with your order number or your name and address. Like 0. Reply.
If you own a Dell product, you may be asked for a 5 to 7 character Dell Service Tag in certain situations. A Service Tag is required for phone support, updating drivers on Dell's website, or checking your warranty status. Here's how to find the service tag for your Dell device.