BIN Lookup Tool

What is a BIN number?

A Bank Identification Number (BIN) — also called an Issuer Identification Number (IIN) — is the first 6 to 8 digits of a payment card number. These digits uniquely identify the institution that issued the card: the bank, credit union, or fintech. The remaining digits are the account number and a check digit.

BINs are defined and managed by the major card networks (Visa, Mastercard, Amex, Discover) and registered through the ISO 7812 standard. Every card in circulation has a BIN that points to its issuer, card type, and country of origin.

Why BINs matter for chargeback management

When a chargeback is filed, the issuing bank plays a critical role — it's the institution that receives the cardholder's dispute and decides whether to accept the merchant's rebuttal. Knowing the issuing bank from the BIN helps merchants:

• Identify high-risk card types — prepaid cards have higher fraud and chargeback rates than standard debit/credit cards.
• Verify country of issue — a card issued in a high-fraud country flagged during order review can strengthen fraud-prevention arguments in a dispute.
• Cross-reference the issuer — some banks have stricter reversal policies; knowing the issuer helps set realistic expectations for dispute outcomes.
• Detect friendly fraud patterns — recurring chargebacks from the same BIN range may indicate an organised fraud group.

How to use BIN lookup in dispute investigation

When you receive a chargeback notification, the dispute record typically includes the first 6 digits of the card used in the transaction. Follow these steps:

1. Extract the BIN from your payment processor dashboard or the chargeback notification document.
2. Run the BIN lookup using the tool above. Note the issuing bank, card type, and country.
3. Compare with order data — if the card is issued in Germany but the shipping address is in Brazil, that mismatch is evidence worth including in your rebuttal letter.
4. Flag prepaid cards — if the card is prepaid and the chargeback reason is “not as described,” include this in context. Prepaid cards are frequently used in friendly fraud schemes.
5. Document your findings in the evidence package you submit via ChargeMate.

BIN formats by card network

Each major card network allocates BIN ranges differently. The table below summarises the standard prefixes for chargeback investigation reference.