Bank Identification Number
A bank identification number is the first six — now eight — digits of a card number, identifying the issuing bank, the network, the card type (debit, credit, prepaid, commercial), the product tier and the country. Every card is issued under a BIN the scheme assigned to a member; a fintech without its own membership issues under a BIN sponsor's number, and a merchant's fraud and routing engines read the BIN first.
- Also known as
- BIN, Issuer identification number, IIN, BIN sponsor
- Used at
- routing (which network, which issuer), fraud rules (country of issue, card type), interchange calculation (the BIN says whether a card is regulated debit or commercial credit), and card issuance (a programme needs a BIN)
- Binding
- the schemes assign BINs to principal members and register the sub-ranges used by sponsored programmes; the ISO/IEC 7812 standard defines the format; the expansion from six to eight digits was completed in 2022 as ranges ran short
- Typical data in a BIN lookup
- issuer name, network, card type, product (classic, gold, business), country, regulated status, prepaid flag — sold as BIN databases by the schemes and vendors, and never quite complete
- Typical fintech use
- BIN sponsorship — a bank member of Visa or Mastercard lends a BIN range to a fintech's card programme, in exchange for fees and oversight; the cards carry the sponsor's BIN and the fintech's brand
- Parties
- the schemes, the issuing banks, BIN sponsors and their programme managers, processors that read BINs to route, and merchants and acquirers whose rules key on them
How a bank identification number works in practice
A card number 4571 2345 6789 0123 begins with 457123: a BIN lookup says Visa, a particular bank, consumer debit, issued in Portugal, regulated. A merchant's checkout uses that before authorisation: it routes through the Visa network; its fraud rules note a Portuguese card on a Portuguese IP address; its interchange model expects a regulated debit rate; and if the merchant offers instalments or local payment methods, the BIN decides what to show. Acquirers price by BIN type; issuers' processors route by BIN to the right authorisation host; and card-testing bots iterate through BINs looking for issuers with weak controls.
For a fintech the BIN is how it exists as a card issuer. A neobank without a scheme membership contracts with a BIN sponsor — a member bank — which allocates a range from its own BINs to the neobank's programme, holds the scheme relationship and the settlement obligation, and charges for it. The cards say the neobank's name and carry the sponsor's BIN; the sponsor's regulator supervises the programme; the sponsor can end it. Larger fintechs obtain their own membership and their own BINs, which is a licence, capital and a year's work — and an asset a buyer values, because it removes the dependency.
For diligence on a card programme: whose BIN, on what terms, and how long to migrate to another if the sponsor gives notice — a BIN migration means reissuing every card.
Example
A neobank with 400,000 cards issues under a BIN sponsor's range at $0.35 per active card per month plus a share of interchange. The sponsor, under a regulator's consent order, gives twelve months' notice. The neobank's options: a new sponsor (six to nine months to contract and certify, then reissue 400,000 cards at $4 each — $1.6m — over the notice period, with the churn a new card number causes on stored credentials), or its own membership (a licence it does not hold, capital of $10m+, and eighteen months). It signs with a new sponsor in month four and reissues in waves; 6% of customers with cards on file at merchants lose a recurring payment and 2% churn. A buyer that looked at the neobank a year earlier had priced exactly this scenario and been told it was unlikely.
Common mistakes
- Fraud rules on a BIN database three years old, in which half the new ranges are unknown. - A card programme with one sponsor and no plan for the notice letter. - Reading the first six digits when the issuer's range is defined at eight. - Treating BIN country as cardholder location. - Buyers valuing a card programme's cards without asking whose BIN they carry.