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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.
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, [1] FedEx, [2] and the United States Postal Service. [3]
For instance, the UPC-A barcode for a box of tissues is "036000241457". The last digit is the check digit "7", and if the other numbers are correct then the check digit calculation must produce 7. Add the odd number digits: 0+6+0+2+1+5 = 14. Multiply the result by 3: 14 × 3 = 42. Add the even number digits: 3+0+0+4+4 = 11.
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 valid DEA number consists of: 2 letters, 6 numbers, and 1 check digit; The first letter is a code identifying the type of registrant (see below) The second letter is the first letter of the registrant's last name, or "9" for registrants using a business address instead of name.
ISO/IEC 7064 is a standard promulgated by the International Standards Organization (ISO) and International Electrotechnical Commission (IEC) that defines algorithms for calculating check digit characters. The checks should be applicable to alphanumeric strings and should be able to detect all single substitution errors, all or nearly all single ...
GLNs use the standard GS1 Check Digit as the default for all GS1 identifiers unless another check digit method is specified. Per the official GS1 General Specification [4] the check digit is a 'modulo 10 check digit' or Luhn algorithm check digit. GS1 also provides a check digit calculator.
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]