Wikipedia
Ad-ID is the advertising industry standard unique identifier for all commercial assets airing in America. It has utilized the ISCI system since 2003. The use of Ad-ID helps assure that the correct assets are delivered to the media, and ultimately, to the end consumer by providing a central, secure, web-based source for stakeholders throughout the marketing communications landscape. It is mostly used in Television and Radio but has been gaining traction online and in print.
There is an equivalent code in France called ARPP.TV which also is the French industry standard unique identifier for all ads.
Critical information about each ad and campaign is managed with Ad-ID. Details of the ad, what media the ad will be used in, clearance status, usage restrictions, related executions, and other vital information can be accessed by authorized users.