The ISAN was developed in the year 2000 and published by ISO in 2002. It identifies an audiovisual work – so it applies to films, TV shows, video games, etc. ISANs are used by film and television studios, services such as iTunes and HBO, and technology companies like Microsoft.
The first twelve numbers of the ISAN form the “root” of the identifier. The root is assigned to the core work. The next set of numbers applies to the episode or part (if there is one – if not, the next four numbers are zeroes). The next character is a check character. The next eight numbers identify the version of the work. The last number is also a checksum.