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Do UPS, Fedex, and Post Office tracking numbers repeat?

Asked by elbanditoroso (33145points) August 20th, 2016

All UPS shipments start with 1Z, I think, followed by an alphanumeric string.

Fedex Ground starts with 6, from my experience, and regular fedex with 7 or 8, but I haven’t been able to figure out a pattern.

USPS tracking all seems to start with 9, and they have a chart that shoes what the prefixes are suppose to mean.

My question: do tracking numbers ever repeat?

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