What is a BIN (Bank Identification Number)?
A Bank Identification Number (BIN) is the first six to eight digits of a payment card number. These digits identify the card-issuing bank, the card brand, the card type, and the country of issue, helping payment processors route transactions correctly.
How Bank Identification Numbers Work
Every payment card — whether it is a debit card, credit card, or prepaid card — starts with a series of digits known as the Bank Identification Number. Historically, the BIN was the first six digits of the card number, but in 2022 the industry expanded this to eight digits to accommodate the growing number of card issuers worldwide.
When you make a payment, the BIN is the first piece of information the payment system reads. It tells the payment gateway and processor which bank issued the card, what network it belongs to (Visa, Mastercard, American Express, etc.), and whether it is a debit or credit card. This information is essential for routing the transaction to the correct issuing bank for authorisation.
What Information Does a BIN Contain?
The BIN encodes several key details about the card:
- Card brand — Visa cards typically start with 4, Mastercard with 5 (or 2 for newer ranges), and American Express with 3.
- Issuing bank — The specific financial institution that issued the card to the cardholder.
- Card type — Whether the card is a credit, debit, or prepaid card.
- Card level — Whether it is a standard, gold, platinum, or corporate card.
- Country of issue — The country where the issuing bank is located.
BIN vs IIN
You may also see the term Issuer Identification Number (IIN). The terms BIN and IIN refer to the same thing. The ISO standard that governs card numbering officially uses IIN, but the payments industry still widely uses BIN. Both refer to the leading digits that identify the card issuer.
Why BINs Matter for Businesses
Transaction routing
BINs ensure that each transaction reaches the correct issuing bank. Without this identification, payment networks would have no way to route authorisation requests efficiently.
Fraud prevention
BIN data is a valuable tool in fraud detection. If a customer claims to be in the United Kingdom but their card was issued by a bank in a high-risk country, fraud screening systems can flag the transaction for review. BIN checks also help identify cards that have been reported as stolen or compromised.
Cost management
Different card types carry different interchange fees. Corporate cards and international cards typically cost more to process than domestic debit cards. By analysing BIN data, businesses can understand their transaction cost profile and optimise their payment acceptance strategy.
BIN and the Full Card Number
The full Primary Account Number (PAN) on a payment card is typically 16 digits long (though some cards use 15 or 19 digits). The BIN occupies the first six to eight digits, the middle digits identify the individual account holder, and the final digit is a check digit calculated using the Luhn algorithm to detect entry errors.
When a customer makes a payment through Paytia's secure telephone payment system, the card number — including the BIN — is captured using DTMF suppression technology. The card data is transmitted directly to the payment gateway without passing through the contact centre environment, so your agents never see the full card number or the BIN.
Paytia's payment processing partners use BIN data behind the scenes to route transactions to the correct issuing bank, apply fraud screening rules, and determine the appropriate interchange category. Because Paytia integrates with major payment gateways, all BIN-based routing and validation happens automatically as part of the secure payment flow.
This means your business benefits from accurate transaction routing and fraud detection without ever needing to handle or store card data — including BIN information — in your own systems.
Frequently Asked Questions
How many digits is a BIN?
A BIN is traditionally six digits, but the industry expanded to eight digits in 2022 to accommodate the growing number of card issuers globally.
Can a BIN tell you which bank issued a card?
Yes. The BIN identifies the issuing bank, the card brand (Visa, Mastercard, etc.), the card type (credit, debit, prepaid), and the country of issue.
Is BIN data considered sensitive under PCI DSS?
The BIN alone is not classified as sensitive authentication data. However, the full card number (PAN) is considered cardholder data and must be protected under PCI DSS requirements.
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