Credit Card BIN Checks

The Bank Identification Number (BIN) — the first six digits of a payment card's account number — reveals which bank issued the card and where. A BIN check uses that to flag mismatches and other risk signals before a transaction goes further.

What it's used for

• Confirming the issuing bank's country lines up with the customer's stated location and billing address
• Inline validation that the entered card brand (Visa, MasterCard, etc.) actually matches the number typed in
• Export compliance verification
• Identifying prepaid cards that shouldn't be used for recurring billing
• Flagging card batches known to be compromised after a data breach

How the number is structured

Card numbers follow the ISO 7812 standard: a single-digit industry identifier, a six-digit issuer identifier, the account number itself, and a Luhn algorithm checksum digit. The term "Issuer Identification Number" (IIN) is gradually replacing "Bank Identification Number" in the industry, though BIN is still the more common term in practice.

Implementation options

Build in-house with a purchased BIN database that needs regular updates, use a third-party service, or access BIN data through your payment acquirer directly.