Tracking number

Tracking numbers are numbers assigned to packages when they are shipped. Tracking numbers are useful for knowing the location of time sensitive deliveries. It is a unique ID number or code assigned to a package or parcel. The tracking number is typically printed on the shipping label as a bar code that can be scanned by anyone with a bar code reader or smartphone.

In the United States, some of the carriers using tracking numbers include UPS, FedEx, and the United States Postal Service. Most postal services use the S10 (UPU standard) (format AA 00000000 9 BB) for international mailings, including the United States Postal Service and most European Postal Services.