1 EXHIBIT 21 SUBSIDIARIES OF FTP SOFTWARE, INC. ---------------------------------- JURISDICTION OF NAME ORGANIZATION - ---- ------------ Campbell Services, Inc. Michigan FTP Software Asia, Inc. Massachusetts FTP Software (Asia Pacific) Pte Ltd Singapore FTP Software Canada Ltd. Alberta, Canada FTP Software Export, Inc. Bahamas FTP Software Kabushiki Kaisha Japan (a/k/a FTP Software K.K.) FTP Software GmbH Germany FTP Software Limited U.K. FTP Software Security Corp., Inc. Massachusetts FTP Software Worldwide, Inc. Massachusetts Firefox Communications Inc. Delaware Firefox (U.S.) Inc. Delaware