Tracking numbers are numbers given to packages when they are shipped. Tracking numbers are useful for knowing the location of time sensitive deliveries. In the United States, some of the companies and organizations that use tracking numbers are UPS, FedEx, and the United States Postal Service.
A FedEx tracking number typically includes 15 digits.
A UPS tracking number, for domestic packages within the United States, will usually start with "1Z" followed by a 6 character shipper number (numbers and letters), a 2 digit service level indicator (e.g., 03 for GROUND), and finally 8 digits identifying the package, for a total of 18 characters.
- "Tracking Information". UPS. Retrieved 31 December 2011.
- "FedEx Tacking". Retrieved 31 December 2011.
- "USPS Tracking".
- USPS (date unknown). Track & Confirm label ID numbers. United States Postal Service. Retrieved from http://hdusps.esecurecare.net/cgi-bin/hdusps.cfg/php/enduser/std_adp.php?p_faqid=1125&&p_sid=kY.
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