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Basics of Credit Card
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Credit Card Types
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Credit Card Issues
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Info On Credit Card
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Account Number
Financial institutions, including credit card companies, issue unique account numbers to customers. These are the numbers reverse stamped or embossed across the face of the plastic card account holders receive. In addition to providing a system for the tracking of individual accounts, a credit card account number contains certain key bits of information.

The first digit, for instance, is the Major Industry Identifier (MII). Account numbers that begin with the numeral "4" have been issued by a bank or other financial institution. Account numbers beginning with "7" are issued by a petroleum company, while "8" indicates a telecommunications card.

The first six digits of the account number including the MII are the Issuer Identifier while digits 7 to the end are the individual account identifier. (The maximum length of digits in a credit card number is 19.) Under this numbering scheme each credit card issuer has the potential to generate a trillion unique account numbers.

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