EXHIBIT 21 SUBSIDIARIES OF THE REGISTRANT State or Other Jurisdiction of Other Names Under Which Name of Subsidiary Incorporation or Organization Subsidiary Does Business - ------------------------------------------- ------------------------------ ------------------------------------- Qwest Communications Corporation(1) Delaware (a) Qwest Communications Corporation d/b/a Qwest Communications The Power of Connections (b) Qwest Communications Corporation of Delaware (c) Qwest Communications d/b/a The Power of Connections (d) Qwest Communications The Power of Connections, Inc. Qwest Corporation Colorado None SuperNet, Inc. Colorado None Phoenix Network, Inc. Delaware None Phoenix Telecom, Inc. Delaware None Phoenix Network, Inc. of New Hampshire New Hampshire None Phoenix Network Acquisition Corp. Delaware None Phoenix TNC Corporation Delaware None AmeriConnect, Inc. Delaware None EUnet International Limited United Kingdom N/A Qwest B.V. The Netherlands None KPNQwest B.V. The Netherlands None LCI International, Inc. Delaware None LCI International Telecom Corp. Delaware None LCI International of Virginia, Inc. Virginia None LCI California Assets, LLC Delaware None LCI International Management Services, Inc. Delaware None LCI Telecom UK, Ltd. United Kingdom None LCI SPC I, Inc. Delaware None LCI International CA, Inc. Delaware None #1056974 Ontario Inc. Ontario None USLD Communications Corp. Delaware None USLD Communications, Inc. Texas None U.S. Long Distance, Inc. Texas None U.S. Long Distance Corp. Delaware None Mega Plus Dialing Inc. British Columbia None Qwest Internet Solutions, Inc. Delaware None Qwest Cyber.Solutions LLC Delaware None Qwest Transmission, Inc. Delaware None Qwest 1999-R Acquisition Corp. New York None Qwest 1999-W Acquisition Corp. Delaware None - --------- (1) Qwest Communications Corporation also uses the trade name "SP Construction Services."