Credit card numbering
Main article: Credit card number
The numbers found on credit cards have a certain amount of internal structure, and share a common numbering scheme.
The card number's prefix, called the Bank Identification Number, is the sequence of digits at the beginning of the number that determine the bank to which a credit card number belongs. This is the first six digits for Mastercard and Visa cards. The next nine digits are the individual account number, and the final digit is a validity check code.
In addition to the main credit card number, credit cards also carry iss
Main article: Credit card number
The numbers found on credit cards have a certain amount of internal structure, and share a common numbering scheme.
The card number's prefix, called the Bank Identification Number, is the sequence of digits at the beginning of the number that determine the bank to which a credit card number belongs. This is the first six digits for Mastercard and Visa cards. The next nine digits are the individual account number, and the final digit is a validity check code.
In addition to the main credit card number, credit cards also carry iss
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