: The first 6 to 8 digits identify the specific bank or financial institution that issued the card.

To combat physical skimming and identity theft, many modern issuers are shifting toward . How to Decode Credit Card Numbers

: The final digit is calculated using the Luhn Algorithm . It is used by payment systems to instantly verify the card number's validity and catch entry errors. The Rise of "Numberless" Credit Cards

: The first digit identifies the card's industry and network. For example, 4 represents Visa and 5 represents Mastercard .