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Enter Service Tag or Express SVC or S/N:
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1. Service Tag or ST is 7 alphanumeric characters long. To avoid confusion, there are no letters E, I, O, U.
2. Express Service Code or EX is 11 digits long, it acts as a replacement for service tag when shared over a phone call, as spelling letters is not required.
3. S/N is a long 20-28 alphanumeric identifier, typically used for monitors & networking equipment with or without service tag.