What Is Bank Identification Number? Definition, Payment Flow, and Examples
Bank Identification Number (BIN) is the traditional industry name for the leading PAN digits that identify an issuing range; IIN is the more formal modern term. This guide focuses on BIN's real role, boundaries, and common points of confusion.
Key points
- Definition: Bank Identification Number (BIN) is the traditional industry name for the leading PAN digits that identify an issuing range; IIN is the more formal modern term.
- Flow position: The PAN identifies a card-account relationship in payment processing, while an IIN or BIN is the leading range used for issuer identification and routing.
- Do not confuse: BIN / Issuer Identification Number
How it fits into the payment flow
For BIN, the relevant process is as follows: The PAN identifies a card-account relationship in payment processing, while an IIN or BIN is the leading range used for issuer identification and routing. Six- and eight-digit IIN allocations exist, so systems should not permanently assume a six-digit BIN.
A practical review of BIN should account for this: troubleshooting should retain only the identifiers that are necessary. A merchant ID identifies an acceptance-side merchant, not the cardholder account, and it is not a substitute for a transaction identifier.
Practical example
A routing system reads the leading BIN range to select issuer and network configuration. It supports current range lengths instead of hard-coding every BIN as six digits.
How it differs from related terms
| Term | Definition |
|---|---|
| Bank Identification Number | is the traditional industry name for the leading PAN digits that identify an issuing range; IIN is the more formal modern term |
| Issuer Identification Number | is the leading portion of a PAN assigned to identify an issuer's card-number range under applicable standards |
| Primary Account Number | is the principal card number carried in card credentials and used to identify the issuer range and the particular card-account relationship |
BIN focuses on the fact that it is the traditional industry name for the leading PAN digits that identify an issuing range; IIN is the more formal modern term. Issuer Identification Number, by contrast, is the leading portion of a PAN assigned to identify an issuer's card-number range under applicable standards. They can appear in one transaction while answering different questions.
Use cases and limits
A key limit of BIN is the following: A full PAN is protected cardholder data. Display masking, log redaction, and stored-data truncation are different controls; seeing only the last four digits on screen does not prove the backend lacks a full PAN.
Frequently asked questions
These answers address two common search questions about BIN.
Is it the same as Issuer Identification Number?
No. Bank Identification Number (BIN) is the traditional industry name for the leading PAN digits that identify an issuing range; IIN is the more formal modern term. Issuer Identification Number (IIN) is the leading portion of a PAN assigned to identify an issuer's card-number range under applicable standards. Compare the object, processing stage, and responsible party.
Are BIN and IIN always two different numbers?
For BIN, they are commonly used for the issuer-identifying leading range of a PAN. Length and terminology should follow the network, ISO allocation, and system documentation in use.
These primary sources support the definition and process for BIN. Current product, network, and local rules still control a real transaction.