UPS Shipment Tracking

Frequently asked questions:
What is UPS tracking number?
UPS Tracking number is eighteen alpha-numeric characters. It starts with '1Z' and ends with check digit. For example, 1Z 999 AA1 01 2345 6784. Checkdigit shows whether UPS tracking number contains a mistype.
What does it mean 'Ups tracking number has correct format, but wrong check digit'?
Ups tracking number contains checkdigit that depends on characters in the tracking number. If calculated checkdigit differs from checkdigit from UPS tracking number, this indicates misprint. Check tracking number and provide correct number.
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