A BIN or Bank Identification Number is assigned to a bank for its own credit card issuance.

The first six digits on a credit card is the BIN and can be used to identify the issuing bank that issued the card. The ISO Register of BINs/IINs for US banks is managed by the American Bankers Association. BINs (Bank Identification Numbers) can be used by online merchants as an extra measure to confirm the geographic area where the cardholder is located to the geographic area identified by the BIN. This can also be referred to as an IIN or Issuer Identification Number,

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BIN (Bank Identification Number)