ISO 6166

ISO 6166 defines the structure of an International Securities Identifying Number (ISIN). An ISIN uniquely identifies a fungible security. Securities with which ISINs can be used are equities, debts, ETFs, options, derivatives, and futures.

ISINs consist of two alphabetic characters, which are the ISO 3166-1 alpha-2 code for the issuing country, nine alpha-numeric digits (the National Securities Identifying Number, or NSIN, which identifies the security), and one numeric check digit. The NSIN is issued by a national numbering agency (NNA) for that country. Regional substitute NNAs have been allocated the task of functioning as NNAs in those countries where NNAs have not yet been established.

NNAs cooperate through the Association of National Numbering Agencies (ANNA). ANNA also functions as the ISO 6166 Registration Authority (RA).

See also

• Central Index Key
• CUSIP
• International Securities Identifying Number
• ISO 10383
• ISO 10962
• NSIN

External links

• Association of National Numbering Agencies – has more information on ISO 6166 and provides contact details to National Numbering Agencies being responsible for ISIN allocation
• Prüfziffernberechnung in der Praxis – site in German; describes in detail how to construct the ISIN from the NSIN