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A Modulus 10 digit calculation is used to verify that the barcode has been read correctly, also referred to as the Luhn algorithm. USPS and Canada Post both use the same system to verify the barcodes, with a difference that USPS uses a 20 digit numeric tracking number. These types of barcodes are referred to as GS1-128. [58]
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.
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 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.
A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...
Individual Identification Number is a 10 digit number issued by the tax administration. The first 5 digits represent birthday as the number of days since 01/01/1900 (more numbers can be assigned to the same day, this additional or alternative numbers have greater first digit, typically 8).
The service became quickly popular: for UPS the number of packages tracked on the web increased from 600 a day in 1995 [9] to 3.3 million a day in 1999. [10] On-line package tracking became available for all major carrier companies, and was improved by the emergence of websites that offered consolidated tracking for different mail carriers. [11]
In the late 1960s, however, the Post Office began implementing a three-digit zone number scheme in major cities to replace existing one- and two-digit zone numbers, starting in Montreal, Toronto, and Vancouver. [10] For example, an address in Metropolitan Toronto would be addressed as: [11] 1253 Bay Street Toronto 185, Ontario