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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, and finally 8 digits identifying the package (the last digit being a check digit), for a total of 18 characters.
The identifiers consist of a two-letter service indicator code, an eight-digit serial number (in the range 00000000 to 99999999), a single check-digit, and a two-letter ISO country code identifying the issuing postal administration's country.
The tracking number may come from the USPS, UPS, or another carrier; how scammers access the numbers is unclear, but that's a problem for the carriers to address.
In a database, storing the ZIP+4 code in a 10 character field (with the hyphen) allows easy output in the address block, and storing the check digit in a 3-digit field (instead of calculating it) allows automatic checking of the validity of the ZIP+4 and delivery point fields in case one had been changed independently.
A PLANET barcode appears either 12 or 14 digits long. The barcode: identifies mailpiece class and shape; identifies the Confirm Subscriber ID; includes up to 6 digits of additional information that the Confirm subscriber chose, such as a mailing number, mailing campaign ID or customer ID
Drop the check digit (last digit) of the number to validate. (e.g. 17893729974 → 1789372997) ... United States Postal Service package tracking numbers use a ...
This section of the code may be omitted, but if it is present, the 5-, 9-, or 11-digit forms of the ZIP Code are also encoded in the Intelligent Mail barcode. The full 11-digit form includes the standard 5-digit ZIP code, the ZIP + 4 code, and a 2-digit code indicating the exact delivery point. This is the same information that was encoded in ...
A 6 digit (plus check digit) barcode, containing the last 2 digits of the ZIP Code and the 4 digits of the ZIP+4 Code, referred to as a "B" code. 37 bars total. In the early stages of Postal automated mail processing the B code was used to "upgrade" mail that had been coded only with a 5-digit "A" code.