Cards
Bank Identification Number
Also: BIN, IIN
The first 6–8 digits of a card number, identifying the issuer, country, scheme, and product type.
A Bank Identification Number (BIN), also referred to as an Issuer Identification Number (IIN), represents the initial sequence of digits on a payment card issued by schemes such as Visa or Mastercard. While historically consisting of the first six digits, ISO/IEC 7812-1 standards have expanded the official length to eight digits to accommodate the growing volume of card issuers globally. This identifier allows payment gateways and acquirers to determine the issuing bank, the country of origin, the specific card brand, and the product category, such as whether a card is debit, credit, prepaid, or commercial. In terms of mechanics, the BIN is essential for calculating interchange fees and applying relevant surcharges, as well as meeting regulatory requirements like Strong Customer Authentication (SCA) under PSD2. Merchants and processors use these numbers to evaluate transaction risk, route payments to preferred regional acquirers, and apply specific fraud filters based on the historical performance of specific card ranges.
Frequently asked
How does the 8-digit BIN migration affect merchant reporting?
The transition from 6-digit to 8-digit BINs means that legacy reporting systems may struggle with data granularity and mapping. Merchants must ensure their payment providers supply the expanded range to accurately calculate interchange costs and identify product types for compliance purposes.
Can a BIN be used to identify if a card is eligible for 3D Secure?
The BIN provides the initial indication of whether an issuer supports 3D Secure protocols based on their card range and country of operation. However, a real-time lookup via a directory server is still required to confirm the specific enrollment status of an individual card during the checkout flow.
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