EXHIBIT 21.1 SUBSIDIARIES OF ASIAINFO HOLDINGS, INC. Name under which State or other jurisdiction Subsidiary the subsidiary does business of incorporation - ------------------------------------------------------------------------------------------------------- AsiaInfo H.K. Limited AsiaInfo HK Hong Kong AsiaInfo (H.K.) Systems Co. Limited AsiaInfo HK Hong Kong AsiaInfo Technologies (Chengdu), Inc. AsiaInfo Chengdu China AsiaInfo Technologies (China), Inc. AsiaInfo Technologies China Bonson Information Technology Bonson Information Cayman Holdings Limited Technology Limited Islands Bonson Information Technology Bonson Information British Limited Technology Limited Virgin Islands AsiaInfo Management Software, Inc. AsiaInfo Management Software China Marsec Holdings, Inc. Marsec Cayman Islands Marsec System, Inc. Marsec China