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The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers.
The final digit of a Universal Product Code, International Article Number, Global Location Number or Global Trade Item Number is a check digit computed as follows: [3] [4]. Add the digits in the odd-numbered positions from the left (first, third, fifth, etc.—not including the check digit) together and multiply by three.
The numbers on a credit card help identify the credit card network, the company that issued the card and the cardholder. ... Finally, the last digit is known as a “check” digit. This is based ...
Payment card numbers are composed of 8 to 19 digits, [1] The leading six or eight digits are the issuer identification number (IIN) sometimes referred to as the bank identification number (BIN). [2]: 33 [3] The remaining numbers, except the last digit, are the individual account identification number. The last digit is the Luhn check digit.
A typical British bank statement header (from a fictitious bank), showing the location of the account's IBAN. The International Bank Account Number (IBAN) for example LV30RIKO0000083232646 is an internationally agreed upon system of identifying bank accounts across national borders to facilitate the communication and processing of cross border transactions with a reduced risk of transcription ...
For example, the first two digits of a commercial bank’s routing number fall under the 01-12 series of numbers. Traveler’s check and electronic transaction identifiers each have their own two ...
However, when the string contains only a few digits or it's mixed with non-digit character, it does not always produce a more compact code than code sets A or B. Using code set C saves one symbol per two digits, but costs a mode-shift symbol to enter and exit the set. Thus, it is only worth using if there are enough consecutive digits.
The Creditor Reference is an alphanumeric string, up to 25 characters long, with the letters "RF" at the beginning. After the letters are two check digits, which confirm that the reference will be entered correctly. [2] The remaining part of the Creditor Reference (up to 21 alphanumeric characters) is the Reference.