ISO/IEC 7812

ISO/IEC 7812 Identification cards – Identification of issuers is an international standard published jointly by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It specifies "a numbering system for the identification of the card issuers, the format of the issuer identification number (IIN) and the primary account number (PAN)", and procedures for registering IINs. It was first published in 1989.

ISO/IEC 7812 has two parts:

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

The registration authority for Issuer Identification Numbers (IINs) is the American Bankers Association.

An IIN is currently six digits in length. The leading digit is the major industry identifier (MII), followed by 5 digits, which together make up the IIN. This IIN is paired with an individual account identification number, and a single digit checksum.

In 2015, the industry began work on implementing a change to ISO/IEC 7812 to increase the length of the IIN to 8 digits. The 2017 revision of the standard defines the new eight digit IIN and outlines a timeline for conversion of existing six digits IINs to eight digit IINs.

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