The numbers found on credit cards have a certain amount of internal structure, and share a common numbering scheme. Credit card numbers are a special case of ISO 7812 numbers.
An ISO 7812 contains a single-digit major industry identifier (MII), a six-digit issuer identifier number (IIN), an account number, and a single digit checksum using the Luhn algorithm.
The major industry identifier is considered to be part of the issuer identifier number.
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