IIN
Issuer Identification NumberIdentifiers
The renamed (and extended) BIN. Since 2022, ISO/IEC 7812 expanded the issuer identifier from 6 to 8 digits, allowing more granular identification of issuer products and sub-portfolios. Functionally equivalent to BIN; the term is becoming standard in technical documentation.
In practice.
IIN is the ISO term for what the industry still calls a BIN: the leading digits identifying the issuer. The practical uses are the same, routing, risk rules and geography checks, and the two terms appear interchangeably in documentation.