The BIN, or bank identification number, is the first six to eight digits of a card number. It identifies the issuer along with the card’s brand, type (credit, debit, prepaid, commercial) and country of issue, and every routing and risk system in the payment chain reads it before anything else happens.
Why it matters
BIN data quietly drives strategy. Routing engines use the BIN country to send transactions to a local acquirer, where approval rates run higher. Risk teams block prepaid BINs on free trials because those cards are made for abandonment. And when fraudsters run card testing attacks, the tell is often a stream of attempts across sequential BINs. If you sell cross border, your BIN mix is effectively a map of where your customers bank, and it should inform where you acquire.