International Securities Identification Number (ISIN)

The standard for the International Securities Identification Number (ISO 6166) is the recognised global standard for unique identification of financial instruments.

ISIN codes are a 12-digit alphanumeric code and are comprised of:

  • Country Code: alpha-2 country code specified in ISO 3166 (AU for Australia);
  • Basic Number: 9 alphanumeric characters of the national number;
  • Check Digit: computed according to modulus 10 “double-add-double” formula specified in ISO 6166.

In February 2018, ASX will change the methodology it uses to allocate the Basic Number by replacing the ASX Code (or market identifier) with a unique number to align with global standards. Further information is provided in the implementation brief: International Securities Identification Numbers: Removing the ASX Code – Implementation Brief 13 September 2017.

The ISIN standard (ISO 6166) may be accessed here. Additional information is available on the ANNA website and may be accessed here.