A BIN provides critical metadata used by legitimate payment processors like Mastercard or Stripe to verify transactions.

: The specific bank or credit union that issued the card. Card Type : Whether the card is debit, credit, or prepaid.

However, "BIN lists" shared in text format on unregulated forums are frequently used for , a form of brute-force fraud where criminals systematically guess valid card combinations to make unauthorized purchases. 1. Understanding BIN Data