Subsidiaries of the Registrant (as of February 29, 2000) State of Subsidiary Incorporation - - ---------- ------------- Broadwing Communications Inc. Delaware (formerly IXC Communications, Inc.) Broadwing Communications Services Inc. Delaware (formerly IXC Communications Services, Inc.) Broadwing Telecommunications Inc. Delaware (formerly Eclipse Telecommunications, Inc.) Atlantic States Microwave Transmission Company Nevada Broadwing Communications Services of Virginia Inc. Virginia (formerly IXC Communications Services of Virginia, Inc.) Central States Microwave Transmission Company Ohio Subsidiaries of the Registrant (continued) (as of February 29, 2000) Delaware Capital Provisioning, Inc. Delaware DPNET, Inc. Delaware Eastern Telecom of Washington D.C., Inc. Virginia IXC Business Services LLC Delaware IXC International, Inc. Delaware IXC Internet Services, Inc. Delaware IXC Leasing LLC Delaware IXC Merger Sub, Inc. Delaware Mutual Signal Corp. New York Mutual Signal Corporation of Michigan New York Mutual Signal Holding Corporation Delaware Network Advanced Services, Inc. Louisiana Network Evolutions, Inc. Virginia Progress International, LLC Texas Rio Grande Transmission, Inc. Delaware Telecom Engineering, Inc. Texas The Data Place, Inc. Delaware Tower Communication System Corp. Ohio West Texas Microwave Company Texas Western States Microwave Transmission Company Nevada Marca Tel S.A. de C.V. Mexico