What is a BIN? Bank Identification Number Explained

Published by Uncoder · Guide

A BIN (Bank Identification Number), also called an IIN (Issuer Identification Number), is the first 6 digits of a payment card number. It identifies the issuing bank, card brand (Visa, Mastercard, etc.), card type, and country of origin. Every card worldwide carries a BIN assigned by the card networks.

"The BIN tells you who issued the card and where — but never who owns it."

How a BIN is structured

A 16-digit card number breaks down like this:

• Digits 1–6: the BIN (issuer identification).
• Digits 7–15: the account number (unique to the cardholder).
• Digit 16: the Luhn check digit.

The first digit alone indicates the major industry: 4 for Visa, 5 for Mastercard, 3 for Amex/Diners, 6 for Discover.

Why BINs matter

• Fraud prevention: verify the card's country matches the buyer's location and flag mismatches.
• Routing: payment gateways use BINs to route transactions to the correct processor.
• Testing: developers use BINs to generate test cards for specific banks and regions.
• Analytics: merchants analyze BIN data to understand customer geography.

How to look up a BIN

1. Copy the first 6 digits of the card number.
2. Open the BIN lookup tool.
3. Paste the BIN and submit to see bank, brand, type, and country.

BIN vs full card validation

A BIN lookup only identifies the issuer. To confirm a card number is structurally valid, use the credit card validator (Luhn check). To check live/dead status, use the live CC checker. Combining all three gives a complete picture.

Important limitations

BIN data can be outdated as banks merge or reissue ranges. Always treat BIN results as indicative, not authoritative. Never assume a BIN alone confirms a card is active or funded.

"Use BINs for context and routing — never as proof of ownership or balance."

Try BIN Lookup

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