ISO/IEC 7812

ISO/IEC 7812 Identification cards — Identification of issuers was first published by the International Organization for Standardization (ISO) in 1989. It is the international standard that specifies "a numbering system for the identification of issuers of cards that require an issuer identification number (IIN) to operate in international, interindustry and/or intra-industry interchange", and procedures for registering IINs. ISO/IEC 7812 has two parts:

  • Part 1: Numbering system
  • Part 2: Application and registration procedures

The registration authority of assigned IINs is the American National Standards Institute, but previously it was the American Bankers Association.

An ISO/IEC 7812 number contains a single-digit major industry identifier (MII), a six-digit issuer identification number (IIN), an individual account identification number, and a single digit checksum. The major industry identifier is part of the issuer identifier number.

Read more about ISO/IEC 7812:  Major Industry Identifier, Issuer Identifier Number, Individual Account Identification, Check Digit