The numbers found on credit cards and bank cards have a certain amount of internal structure, and share a common numbering scheme. Credit card numbers are a special case of ISO/IEC 7812 bank card numbers.
An ISO/IEC 7812 number contains a single-digit Major Industry Identifier (MII), a six-digit Issuer Identification Number (IIN), an account number, and a single digit check sum calculated using the Luhn algorithm. The MII is considered to be part of the IIN.
The term "Issuer Identification Number" (IIN) replaces the previously used "Bank Identification Number" (BIN). See ISO/IEC 7812 for more information.
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