United Internet AG is a global Internet services company headquartered in Montabaur, Rhineland-Palatinate, Germany. The company is structured in two business areas, Access and Applications, and has a total of 13 brands and numerous subsidiaries. It is the parent company of three major email providers (GMX, Web.de and Mail.com) and with the brand 1&1 and its 2.91 million DSL customer contracts, it owns the leading ISP in Germany. United Internet's web hosting and cloud computing business is operated by the 1&1 Ionos subsidiary.