ISO 20022 · Account identification
AIINIssuer Identification Number
Published definition
Issuer Identification Number (IIN) - identifies a card issuing institution in an international interchange environment. Issued by ABA (American Bankers Association).
Code set and usage
Account identification contains 4 registered codes. Its exact identifier is ExternalAccountIdentification1Code.
Specifies the external account identification scheme name code in the format of character string with a maximum length of 4 characters. The list of valid codes is an external code list published separately. External code sets can be downloaded from www.iso20022.org.
Use the code with the applicable message version and implementation guide. A matching code value alone does not establish the same meaning in another set.