The International Organization for Standardization (ISO) assigns a series of numbers to each card issuer. It is a special number used in Luhn's algorithm, which ensures the entered credit card is correct and not a typo.Ĭredit card numbers are not completely random. The final digit is known as the check digit. The next series of digits, up to the 15th digit, represent the cardholder's account number. These digits are also called BIN numbers. Using these digits, we can identify whether the card is an American Express, Visa, Mastercard, etc. The first 6 digits of the credit card represent the institution that issued the credit card.
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