Changyou.com Limited develops and operates online games in the People's Republic of China. The company operates through Online Game, Platform Channel, and Others segments. It develops, operates, and licenses online games, including interactive online games that are accessed and played simultaneously by various game players through personal computers; and mobile games played on mobile devices. The company also operates 17173.com Website, an information portal that provides news, electronic forums, online videos, and other information services on online games to game players; and offers various software applications for PCs and mobile devices, as well as purchases pre-film cinema advertising slots to advertisers. As of December 31, 2016, it had approximately 4.1 million total average monthly active accounts; and 1.4 million total active paying accounts. The company was founded in 2003 and is headquartered in Beijing, the People's Republic of China. Changyou.com Limited is a subsidiary of Sohu.com Inc.