1  Issuer identification number (IIN) base Project 1
  Issuer identification number (IIN)
The first six digits of the credit card number(including the initial MII digit) are known as the Issuer Identification Number (IIN). These identify the institution that issued the card to the card holder. The rest of the number is allocated by the issuer. Cards are issued by the issuer through an issuing network. The card number's length is its number of digits. Many credit card issuers print the first four digits of the IIN on their card, just beneath where the number is embossed, as an added security measure.

    - credit cards
    - debit cards
    - charge cards
    - stored-value cards
    - Electronic Benefit Transfer cards
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IIN ranges allocated to issuing networks

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Issuing Network IIN Ranges

Active

 Length Validation Symbol
           
American Express 34, 37 Yes 15 Luhn algorithm AmEx
Bankcard 5610, 560221-560225 No 16 Luhn algorithm BC
China UnionPay 622126-622925, 624-626, 6282-6288 Yes 16-19 unknown CUP
Diners Club Carte Blanche 300-305 Yes 14 Luhn algorithm DC-CB
Diners Club enRoute 2014, 2149 No 15 no validation DC-eR
Diners Club International 36 Yes 14 Luhn algorithm DC-Int
Diners Club United States & Canada 54, 55 Yes 16 Luhn algorithm DC-UC
Discover Card 6011, 622126-622925, 644-649, 65 Yes 16 Luhn algorithm Disc
InstaPayment 637-639 Yes 16 Luhn algorithm IPI
JCB 3528-3589 Yes 16 Luhn algorithm JCB
Laser 6304, 6706, 6771, 6709 Yes 16-19 unknown Lasr
Maestro 5018, 5020, 5038, 6304, 6759, 6761, 6763 Yes 12-19 Luhn algorithm Maes
MasterCard 51-55 Yes 16 Luhn algorithm MC
Solo 6334, 6767 Yes 16, 18, 19 Luhn algorithm Solo
Switch 4903, 4905, 4911, 4936, 564182, 633110, 6333, 6759 Yes 16, 18, 19 Luhn algorithm Swch
Visa 4 Yes 16 Luhn algorithm Visa
Visa Electron 4026, 417500, 4508, 4844, 4913, 4917 Yes 16 Luhn algorithm Visa

 
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1 Luhn algorithm 1

   The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers in US and Canadian Social Insurance Numbers. It was created by IBM scientist Hans Peter Luhn and described in U.S. Patent No. 2,950,048, filed on January 6, 1954, and granted on August 23, 1960.

The algorithm is in the public domain and is in wide use today. It is specified in ISO/IEC 7812-1[1]. It is not intended to be a cryptographically secure hash function; it was designed to protect against accidental errors, not malicious attacks. Most credit cards and many government identification numbers use the algorithm as a simple method of distinguishing valid numbers from collections of random digits.
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