EXHIBIT 21.1 SUBSIDIARIES OF REALNETWORKS, INC. NETZIP, INC. AEGISOFT CORP. XING TECHNOLOGY CORPORATION RN ACQUISITION CORP. MULTIPOINT, INC. ULTISOFT, INC. AUDIO MILL, INC. GAMEHOUSE, INC. LISTEN.COM, INC. RN MASSACHUSETTS SALES CORP. REALNETWORKS LTD. REALNETWORKS K.K. REALNETWORKS, SARL REALNETWORKS GMBH REALNETWORKS AUSTRALIA PTY. LIMITED REALNETWORKS OF HONG KONG, LIMITED REALNETWORKS SINGAPORE PTE LIMITED REALNETWORKS KOREA, LTD. REALNETWORKS OF BRAZIL LTDA REALNETWORKS OF MEXICO, S. DE R.L. DE C.V. REALNETWORKS E-COMMERCE LLC REALNETWORKS INVESTMENTS LLC