The ISWN system has a consistent unique code for each wine producer (ISWN-P), each wine brand or product (ISWN-W), each vintage variant of a wine product (ISWN-V), and the bottle variants (ISWN-B). More information on the ISWN website (see below).
The ISWN number is allocated by the ISWN Organization on the basis of a global reference database of wine producers and wines worldwide. The database is improved through wine producers updating their own data with the ISWN Manager module. The ISWN Organization is a non-profit body sponsored by the wine industry.