Under the patronage of HOTREC Hospitality Europe, the hotel associations of Austria, Azerbaijan, Belgium, Czech Republic, Denmark, Estonia, Georgia, Germany, Greece, Hungary, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, the Netherlands, Slovenia, Sweden and Switzerland form the Hotelstars Union, which was founded in 2009 and registered as AISBL in 2021. The Hotelstars Union is based on a common catalogue of criteria for hotel classification and offers transparency, quality and security for guests and hoteliers with more than 22,000 classified hotels or 1.2 million classified rooms in its member countries.