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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 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. ISO/IEC 7812 has two parts:
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 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.
The first (leading) digit of the IIN identifies the major industry of the card issuer.
|MII digit value||Issuer category|
|0||ISO/TC 68 and other industry assignments|
|2||Airlines, financial and other future industry assignments|
|3||Travel and entertainment|
|4||Banking and financial|
|5||Banking and financial|
|6||Merchandising and banking/financial|
|7||Petroleum and other future industry assignments|
|8||Healthcare, telecommunications and other future industry assignments|
|9||For assignment by national standards bodies|
MII 9 has been assigned to national standards bodies for national use. The first digit is a 9 followed by a three-digit numeric country code numeric-3 country code from ISO 3166-1. National Numbering Systems are managed by ISO-member national standards bodies. The US National Numbering system is managed by the American National Standards Institute.
The first six digits, including the major industry identifier, compose the issuer identifier number (IIN) which identifies the issuing organization. The IIN is sometimes referred to as a "bank identification number" (BIN). The IIN's use is much broader than identification of a bank. IINs are used by companies other than banks.
The official "ISO Register of Issuer Identification Numbers", is not available to the general public. It is only available to institutions who hold IINs published in the register, financial networks and processors. Institutions are required to sign a licensing agreement before they are given access to the register. Several IINs are well known, especially those representing credit card issuers.
In conjunction with the IIN, card issuers assign an account number to a card holder. The account number is variable in length with a maximum of 12 digits when used in conjunction with a six digit IIN. When using an eight digit IIN, the maximum total length of the primary account number (PAN) remains at 19 digits. The PAN comprises the IIN, the individual account identifier, and the check digit, so when using an eight digit IIN, the maximum length of an individual account identifier would only be 10 digits.