Exhibit 21
CENTURYLINK, INC.
SUBSIDIARIES OF THE REGISTRANT
AS OF DECEMBER 31, 2017
| Subsidiary | State of incorporation or formation | |
| Actel, LLC | Delaware | |
| Bloomingdale Telephone Company, Inc. (20%) | Michigan | |
| Century Cellunet International, Inc. | Louisiana | |
| Cellunet of India Limited | Mauritius | |
| Century Telephone of West Virginia, Inc. | West Virginia | |
| CenturyLink – Clarke M. Williams Foundation | Colorado | |
| CenturyLink Communications, LLC | Delaware | |
| Cognilytics, Inc. | California | |
| Cognilytics Software and Consulting Private Limited | India | |
| ElasticBox, Inc. | Delaware | |
| netAura, LLC | Delaware | |
| Qwest International Services Corporation | Delaware | |
| CenturyLink do Brasil Participaҫões Ltda. | Brazil | |
| CenturyLink Comunicaҫões Ltda. | Brazil | |
| SAVVIS do Brasil Ltda. | Brazil | |
| Savvis Telecomunicações Ltda. | Brazil | |
| Qwest N Limited Partnership (98.5%) | Delaware | |
| Qwest Transoceanic, Inc. | Delaware | |
| Qwest Communications International Ltd. | United Kingdom | |
| CenturyLink Limited | United Kingdom | |
| CenturyLink Austria GmbH | Austria | |
| Qwest Holdings, BV | Netherlands | |
| CenturyLink Belgium Sprl | Belgium | |
| Qwest France SAS | France | |
| Qwest Germany GmbH | Germany | |
| Qwest Netherlands BV | Netherlands | |
| Qwest Peru S.R.L. | Peru | |
| Qwest Telecommunications Asia, Limited | Hong Kong | |
| Qwest Australia Pty Limited | Australia | |
| Qwest Communications Japan Corporation | Japan | |
| Qwest Communications Korea, Limited | Korea | |
| Qwest Hong Kong Telecommunications, Limited | Hong Kong | |
| Qwest Singapore Pte Ltd. | Singapore | |
| Qwest Taiwan Telecommunications, Limited | Taiwan | |
| SEAL Consulting, Inc. | New Jersey | |
| AppFog, Inc. | Delaware | |
| CenturyLink Europe B.V. | Netherlands | |
| CenturyLink Europe B.V., The Netherlands, filial Sweden | Sweden | |
| CenturyLink Europe B.V., Sucursal en España | Spain | |
| CenturyLink France S.A.S. | France | |
| Subsidiary | State of incorporation or formation | |
| CenturyLink Italia S.r.l. | Italy | |
| CenturyLink New Zealand Limited | New Zealand | |
| CenturyLink Philippines, Inc. | Philippines | |
| CenturyLink Poland Sp Zo.o. | Poland | |
| CenturyLink Switzerland A.G. | Switzerland | |
| CenturyLink Taiwan Limited | Taiwan | |
| CenturyLink Technology Hong Kong Limited | Hong Kong | |
| CenturyLink IT Consulting (Shanghai) Co., Ltd. | China | |
| Digital Savvis HK JV Limited (50%) | British VI | |
| Digital Savvis HK Holding 1 Limited | British VI | |
| Digital Savvis Investment Management HK Limited | Hong Kong | |
| Digital Savvis Management Subsidiary Limited | Hong Kong | |
| CenturyLink Technology Malaysia Sdn. Bhd. | Malaysia | |
| CenturyLink (Thailand) Limited | Thailand | |
| DataGardens, Inc. | Canada | |
| SAVVIS Argentina S.A. | Argentina | |
| SAVVIS Communications Chile, S.A. | Chile | |
| SAVVIS Federal Systems, Inc. | Delaware | |
| SAVVIS Communications International, Inc. | Delaware | |
| CenturyLink Korea Limited | Korea | |
| SAVVIS Communications Private Limited | India | |
| SAVVIS Hungary Telecommunications KFT | Hungary | |
| SAVVIS Mexico, S.A. de C.V. | Mexico | |
| Tier 3, Inc. | Washington | |
| Egnyte, Inc.[1] | Delaware | |
| Wam!Net Japan K.K.[2] | Japan | |
| CenturyLink of Louisiana, LLC | Louisiana | |
| CenturyTel of Adamsville, Inc. | Tennessee | |
| CenturyTel of Arkansas, Inc. | Arkansas | |
| CenturyTel Broadband Services, LLC | Louisiana | |
| CenturyTel TeleVideo, Inc. | Wisconsin | |
| CenturyTel/Teleview of Wisconsin, Inc. | Wisconsin | |
| Qwest Broadband Services, Inc. | Delaware | |
| CenturyTel Broadband Wireless, LLC | Louisiana | |
| CenturyTel of Central Indiana, Inc. | Indiana | |
| CenturyTel of Chester, Inc. | Iowa | |
| CenturyTel of Claiborne, Inc. | Tennessee | |
| CenturyTel Holdings, Inc. | Louisiana | |
| Century Marketing Solutions, LLC | Louisiana | |
| CenturyTel Arkansas Holdings, Inc. | Arkansas | |
| CenturyTel of Central Arkansas, LLC | Louisiana | |
| CenturyTel of Northwest Arkansas, LLC | Louisiana | |
| `CenturyTel Holdings Alabama, Inc. | Alabama | |
| CenturyTel of Alabama, LLC | Louisiana | |
| Subsidiary | State of incorporation or formation | |
| CenturyTel Holdings Missouri, Inc. | Missouri | |
| CenturyTel of Missouri, LLC | Louisiana | |
| CenturyTel Investments of Texas, Inc. | Delaware | |
| CenturyTel of the Northwest, Inc. | Washington | |
| Brown Equipment Corp. | Nevada | |
| Carter Company, Inc. | Hawaii | |
| Honomach PR, Inc. | Puerto Rico | |
| Cascade Autovon Company | Washington | |
| CenturyTel/Cable Layers, Inc. | Wisconsin | |
| CenturyTel of Central Wisconsin, LLC | Delaware | |
| CenturyTel of Colorado, Inc. | Colorado | |
| CenturyTel of Eagle, Inc. | Colorado | |
| CenturyTel of Eastern Oregon, Inc. | Oregon | |
| CenturyTel Entertainment, Inc. | Washington | |
| CenturyTel of Fairwater-Brandon-Alto, LLC | Delaware | |
| CenturyTel of Forestville, LLC | Delaware | |
| CenturyTel of the Gem State, Inc. (97%) | Idaho | |
| CenturyTel of Inter Island, Inc. | Washington | |
| CenturyTel of Larsen-Readfield, LLC | Delaware | |
| CenturyTel of the Midwest-Kendall, LLC | Delaware | |
| CenturyTel of the Midwest-Wisconsin, LLC | Delaware | |
| CenturyTel of Minnesota, Inc. | Minnesota | |
| CenturyTel of Monroe County, LLC | Delaware | |
| CenturyTel of Montana, Inc. (99%) | Oregon | |
| CenturyTel of Northern Wisconsin, LLC | Delaware | |
| CenturyTel of Northwest Wisconsin, LLC | Delaware | |
| CenturyTel of Oregon, Inc. | Oregon | |
| CenturyTel of Paradise, Inc. | Washington | |
| CenturyTel of Cowiche, Inc. | Washington | |
| CenturyTel of Postville, Inc. | Iowa | |
| CenturyTel of Southern Wisconsin, LLC | Delaware | |
| CenturyTel of the Southwest, Inc. | New Mexico | |
| CenturyTel Telecom Service, Inc. | Washington | |
| CenturyTel Telephone Utilities, Inc. | Washington | |
| CenturyTel of Upper Michigan, Inc. | Michigan | |
| CenturyTel of Washington, Inc. | Washington | |
| CenturyTel/WORLDVOX, Inc. | Oregon | |
| CenturyTel of Wyoming, Inc. | Wyoming | |
| Eagle Valley Communications Corporation | Colorado | |
| International Communications Holdings, Inc. | Delaware | |
| Pacific Telecom, Inc. (Shell) | Oregon | |
| PTI Communications of Ketchikan, Inc. | Alaska | |
| PTI Communications of Minnesota, Inc. | Minnesota | |
| PTI Transponders, Inc. | Oregon | |
| Subsidiary | State of incorporation or formation | |
| Universal Manufacturing Corp. | Wisconsin | |
| CenturyTel of Idaho, Inc. | Delaware | |
| CenturyTel Internet Holdings, Inc. | Louisiana | |
| centurytel.com, LLC | Louisiana | |
| CenturyTel Investments, LLC | Louisiana | |
| CenturyTel of Michigan, Inc. | Michigan | |
| CenturyTel Midwest - Michigan, Inc. | Michigan | |
| CenturyTel Mobile Communications, Inc. | Louisiana | |
| CenturyTel of Mountain Home, Inc. | Arkansas | |
| CenturyTel of North Mississippi, Inc. | Mississippi | |
| CenturyTel of Northern Michigan, Inc. | Michigan | |
| CenturyTel of Odon, Inc. | Indiana | |
| CenturyTel of Ohio, Inc. | Ohio | |
| CenturyTel of Ooltewah-Collegedale, Inc. | Tennessee | |
| CenturyTel of Port Aransas, Inc. | Texas | |
| CenturyTel of Redfield, Inc. | Arkansas | |
| CenturyTel SM Telecorp, Inc. | Texas | |
| CenturyTel Telecommunications, Inc. | Texas | |
| CenturyTel of San Marcos, Inc. | Texas | |
| CenturyTel San Marcos Investments, LLC | Delaware | |
| CenturyTel Security Systems, Inc. | Louisiana | |
| CenturyTel Service Group, LLC | Louisiana | |
| CenturyTel of South Arkansas, Inc. | Arkansas | |
| CenturyTel Supply Group, Inc. | Louisiana | |
| CenturyTel/Tele-Max, Inc. | Texas | |
| CenturyTel of Lake Dallas, Inc. | Texas | |
| CenturyTel Web Solutions, LLC | Louisiana | |
| CenturyTel of Wisconsin, LLC | Louisiana | |
| Embarq Corporation | Delaware | |
| Carolina Telephone and Telegraph Company LLC | North Carolina | |
| NOCUTS, Inc. | Pennsylvania | |
| SC One Company | Kansas | |
| Centel Corporation | Kansas | |
| Centel Capital Corporation | Delaware | |
| Centel-Texas, Inc. | Texas | |
| Central Telephone Company of Texas | Texas | |
| EQ Central Texas Equipment LLC | Texas | |
| Central Telephone Company | Delaware | |
| Central Telephone Company of Virginia | Virginia | |
| Embarq Florida, Inc. | Florida | |
| The Winter Park Telephone Company | Florida | |
| CenturyLink Intellectual Property LLC | Delaware | |
| Embarq Directory Trademark Company, LLC | Delaware | |
| CenturyLink Public Communications, Inc. | Florida | |
| Subsidiary | State of incorporation or formation | |
| CenturyLink Sales Solutions, Inc. | Delaware | |
| Embarq, Inc. | Kansas | |
| Embarq Capital Corporation | Delaware | |
| SC Seven Company | Kansas | |
| Embarq Interactive Holdings LLC | Delaware | |
| Embarq Interactive Markets LLC | Delaware | |
| Embarq Management Company | Delaware | |
| EQ Management Equipment LP | Nevada | |
| Embarq Mid-Atlantic Management Services Company | North Carolina | |
| Embarq Minnesota, Inc. | Minnesota | |
| Embarq Missouri, Inc. | Missouri | |
| SC Eight Company | Kansas | |
| Embarq Network Company LLC | Delaware | |
| EQ Equipment Leasing, Inc. | Delaware | |
| United Telephone Company of the Carolinas LLC | South Carolina | |
| SC Two Company | Kansas | |
| United Telephone Company of Eastern Kansas | Delaware | |
| United Telephone Company of Florida | Florida | |
| United Telephone Company of Indiana, Inc. | Indiana | |
| SC Four Company | Kansas | |
| United Telephone Company of Kansas | Kansas | |
| Embarq Midwest Management Services Company | Kansas | |
| United Teleservices, Inc. | Kansas | |
| United Telephone Company of New Jersey, Inc. | New Jersey | |
| United Telephone Company of the Northwest | Oregon | |
| United Telephone Company of Ohio | Ohio | |
| SC Five Company | Kansas | |
| United Telephone Company of Pennsylvania LLC, The | Pennsylvania | |
| SC Six Company | Kansas | |
| Valley Network Partnership (40% aggregate) | Virginia | |
| United Telephone Company of Southcentral Kansas | Arkansas | |
| United Telephone Company of Texas, Inc. | Texas | |
| EQ United Texas Equipment LLC | Texas | |
| United Telephone Company of the West | Delaware | |
| United Telephone Southeast LLC | Virginia | |
| SC Three Company | Kansas | |
| Hillsboro Telephone Company, Inc. (20%) | Wisconsin | |
| Lafayette MSA Limited Partnership (49%) | Delaware | |
| Madison River Communications Corp. | Delaware | |
| Gallatin River Holdings L.L.C. | Delaware | |
| Gallatin River Communications L.L.C. | Delaware | |
| Madison River Finance Corp. | Delaware | |
| Madison River Holdings LLC | Delaware | |
| Madison River LTD Funding LLC | Delaware | |
| Subsidiary | State of incorporation or formation | |
| Coastal Utilities, Inc. | Georgia | |
| Gulf Coast Services, LLC | Alabama | |
| Gulf Telephone Company, LLC | Alabama | |
| Madison River Management LLC | Delaware | |
| Mebtel, Inc. | North Carolina | |
| Pacific Telecom Cellular of Alaska RSA #1, Inc. | Alaska | |
| Qwest Communications International, Inc. | Delaware | |
| EUnet International Limited | United Kingdom | |
| EUnet International B.V. | Netherlands | |
| Qwest B.V. | Netherlands | |
| Qwest Capital Funding, Inc. | Colorado | |
| Qwest Europe LLC | Delaware | |
| Qwest Services Corporation | Colorado | |
| CenturyLink Investment Management Company | Colorado | |
| Qwest Corporation | Colorado | |
| RiskSense, Inc.[1] | Delaware | |
| 1200 Landmark Center Condominium Association, Inc. | Nebraska | |
| Block 142 Parking Garage Association | Colorado | |
| Qwest Database Services, Inc. | Colorado | |
| Qwest India Holdings, LLC | Delaware | |
| CenturyLink Technologies India Private Limited | India | |
| Seal Infotech Private Limited | India | |
| The El Paso County Telephone Company | Colorado | |
| MoveARoo, LLC (33.3%) | Delaware | |
| Qwest Dex Holdings, Inc. | Delaware | |
| Qwest Government Services, Inc. | Colorado | |
| Qwest Wireless, L.L.C. | Delaware | |
| SkyComm Technologies Corporation (50.0%) | Delaware | |
| Spectra Communications Group, LLC | Delaware | |
| TelUSA Holdings, LLC (89%) | Delaware | |
| Telephone USA of Wisconsin, LLC | Delaware | |
| Western Re, Inc. | Louisiana | |
| SIS Holdings LP[1] | Delaware | |
| Wildcat Holdco LLC | Delaware | |
| Level 3 Parent, LLC | Delaware | |
| ACME Grating Ventures, L.L.C. | Delaware | |
| AmSoft Information Services Limited | Mauritius | |
| Broadwing Communications, LLC | Delaware | |
| Broadwing, LLC | Delaware | |
| BTE Equipment, LLC | Delaware | |
| CCC Canada Holding, Inc. | Delaware | |
| Continental Holdings Inc. | Wyoming | |
| Continental Level 3, Inc. | Delaware | |
| Continental Mineral Sales, Inc. | Delaware | |
| Subsidiary | State of incorporation or formation | |
| Corvis Canada Inc. | Federally Chartered | |
| Corvis Gratings Company | Nova Scotia | |
| Eldorado Acquisition Two, Inc. | Delaware | |
| Fibernet UK Limited | United Kingdom | |
| Front Range Insurance Company, Inc. | Hawaii | |
| FTV Communications, LLC | Delaware | |
| GC Impsat Holdings I Limited | United Kingdom | |
| GC Impsat Holdings II Limited | United Kingdom | |
| GC Pan European Crossing UK Limited | United Kingdom | |
| GC SAC Argentina S.R.L. (Uruguay Branch) | Uruguay | |
| Global Crossing Americas Solutions, LLC | Delaware | |
| Global Crossing International Networks Ltd. | Bermuda | |
| Global Crossing International, Ltd. | Bermuda | |
| Global Crossing Local Services, Inc. | Michigan | |
| Global Crossing North America, Inc. | New York | |
| Global Crossing North American Holdings, Inc. | Delaware | |
| Global Crossing Telecommunications, Inc. | Michigan | |
| Global Crossing Telemanagement VA, LLC | Virginia | |
| Impsat Fiber Networks, LLC | Delaware | |
| IP Networks, Inc. | Delaware | |
| KMI Continental Lignite, Inc. | Delaware | |
| Legend Circle Holdings, Inc. | Delaware | |
| Level 3 Argentina, S.A. | Argentina | |
| Level 3 Asia, Inc. | Delaware | |
| Level 3 CDN International, Inc. | Delaware | |
| Level 3 Chile S.A. | Chile | |
| Level 3 Colombia S.A. | Colombia | |
| Level 3 Communications (Asia Pacific) Limited | Hong Kong | |
| Level 3 Communications (IMPSAT) Nederland B.V. | Netherlands | |
| Level 3 Communications (Ireland) Limited | Ireland | |
| Level 3 Communications A.B. | Sweden | |
| Level 3 Communications ApS | Denmark | |
| Level 3 Communications Australia Pty Ltd | Australia | |
| Level 3 Communications Austria GmbH | Austria | |
| Level 3 Communications B.V. | Netherlands | |
| Level 3 Communications B.V. (Greek Branch) | Greece | |
| Level 3 Communications Canada Co. | Nova Scotia | |
| Level 3 Communications EOOD | Bulgaria | |
| Level 3 Communications Espaňa S.A. | Spain | |
| Level 3 Communications Espana S.A. - Sucursal Em Portugal | Portugal | |
| Level 3 Communications Estonia OÜ | Estonia | |
| Level 3 Communications Europe Limited | United Kingdom | |
| Level 3 Communications France SARL | France | |
| Level 3 Communications GmbH | Germany | |
| Subsidiary | State of incorporation or formation | |
| Level 3 Communications Hong Kong Limited | Hong Kong | |
| Level 3 Communications Iceland ehf. | Iceland | |
| Level 3 Communications Italia S.R.L. | Italy | |
| Level 3 Communications Japan KK | Japan | |
| Level 3 Communications Kft | Hungary | |
| Level 3 Communications Limited (Ireland) | Ireland | |
| Level 3 Communications Limited (UK) | United Kingdom | |
| Level 3 Communications of Virginia, Inc. | Virginia | |
| Level 3 Communications Oy | Finland | |
| Level 3 Communications PEC Ireland Limited | Ireland | |
| Level 3 Communications PEC Luxembourg I S.á.r.l. | Luxembourg | |
| Level 3 Communications PEC Luxembourg II S.á.r.l. | Luxembourg | |
| Level 3 Communications PEC Services Europe Limited | Ireland | |
| Level 3 Communications PEC Services Ireland Limited | Ireland | |
| Level 3 Communications PEC Telekomünikasyon Hizmetleri Limited Şirketi | Turkey | |
| Level 3 Communications PEC Ukraine LLC | Ukraine | |
| Level 3 Communications RS d.o.o. | Serbia | |
| Level 3 Communications S.A. | Belgium | |
| Level 3 Communications S.R.L. | Romania | |
| Level 3 Communications s.r.o. | Czech Republic | |
| Level 3 Communications Singapore Pte. Ltd. | Singapore | |
| Level 3 Communications South Africa (Pty) Limited | South Africa | |
| Level 3 Communications Sp. z o.o. | Poland | |
| Level 3 Communications spol. s.r.o. | Slovakia | |
| Level 3 Communications St. Croix, Inc. | Virgin Islands (US) | |
| Level 3 Communications Switzerland AG | Switzerland | |
| Level 3 Communications UK Limited | United Kingdom | |
| Level 3 Communications, Inc. | Delaware | |
| Level 3 Communications, LLC | Delaware | |
| Level 3 Comunicações do Brasil Ltda. | Brazil | |
| Level 3 Ecuador LVLT S.A. | Ecuador | |
| Level 3 EMEA Holdings Limited | United Kingdom | |
| Level 3 Enhanced Services, LLC | Delaware | |
| Level 3 EON, LLC | Delaware | |
| Level 3 Europe B.V. | Netherlands | |
| Level 3 Financing, Inc. | Delaware | |
| Level 3 GC Limited | Bermuda | |
| Level 3 Holdings, B.V. | Netherlands | |
| Level 3 Holdings, Inc. | Delaware | |
| Level 3 International Services, Inc. | Delaware | |
| Level 3 International, Inc. | Delaware | |
| Level 3 Komunikacijske Usluge d.o.o. | Croatia | |
| Level 3 Latin American Solutions, LLC | Delaware | |
| Level 3 Mexico II, S. de R.L. de C.V. | Mexico | |
| Subsidiary | State of incorporation or formation | |
| Level 3 Mexico Landing S. de R.L. | Mexico | |
| Level 3 Mexico Servicios, S. de R. L. de C. V. | Mexico | |
| Level 3 Panama, Inc. | Panama | |
| Level 3 Participacoes e Comercial Ltd. | Brazil | |
| Level 3 PEC Norge AS | Norway | |
| Level 3 Peru S.A. | Peru | |
| Level 3 Telecom Data Services, LLC | Delaware | |
| Level 3 Telecom Holdings II, LLC | Delaware | |
| Level 3 Telecom Holdings, LLC | Delaware | |
| Level 3 Telecom Management Co., LLC | Delaware | |
| Level 3 Telecom of Alabama, LLC | Delaware | |
| Level 3 Telecom of Arizona, LLC | Delaware | |
| Level 3 Telecom of Arkansas, LLC | Delaware | |
| Level 3 Telecom of California, LP | Delaware | |
| Level 3 Telecom of Colorado, LLC | Delaware | |
| Level 3 Telecom of D.C., LLC | Delaware | |
| Level 3 Telecom of Florida, LP | Delaware | |
| Level 3 Telecom of Georgia, LP | Delaware | |
| Level 3 Telecom of Hawaii, LP | Delaware | |
| Level 3 Telecom of Idaho, LLC | Delaware | |
| Level 3 Telecom of Illinois, LLC | Delaware | |
| Level 3 Telecom of Indiana, LP | Delaware | |
| Level 3 Telecom of Iowa, LLC | Delaware | |
| Level 3 Telecom of Kansas City, LLC | Delaware | |
| Level 3 Telecom of Kentucky, LLC | Delaware | |
| Level 3 Telecom of Louisiana, LLC | Delaware | |
| Level 3 Telecom of Maryland, LLC | Delaware | |
| Level 3 Telecom of Minnesota, LLC | Delaware | |
| Level 3 Telecom of Mississippi, LLC | Delaware | |
| Level 3 Telecom of Nevada, LLC | Delaware | |
| Level 3 Telecom of New Jersey, LP | Delaware | |
| Level 3 Telecom of New Mexico, LLC | Delaware | |
| Level 3 Telecom of New York, LP | Delaware | |
| Level 3 Telecom of North Carolina, LP | Delaware | |
| Level 3 Telecom of Ohio, LLC | Delaware | |
| Level 3 Telecom of Oklahoma, LLC | Delaware | |
| Level 3 Telecom of Oregon, LLC | Delaware | |
| Level 3 Telecom of South Carolina, LLC | Delaware | |
| Level 3 Telecom of Tennessee, LLC | Delaware | |
| Level 3 Telecom of Texas, LLC | Delaware | |
| Level 3 Telecom of Utah, LLC | Delaware | |
| Level 3 Telecom of Virginia, LLC | Virginia | |
| Level 3 Telecom of Washington, LLC | Delaware | |
| Level 3 Telecom of Wisconsin, LP | Delaware | |
| Subsidiary | State of incorporation or formation | |
| Level 3 Telecom, LLC | Delaware | |
| Level 3 Telecom, LP | Delaware | |
| Level 3 telekomunikacijske d.o.o. | Slovenia | |
| Level 3 Venezuela S.A. | Venezuela | |
| Level Three Communications Costa Rica, S.R.L. | Costa Rica | |
| Level Three Communications Israel Ltd. | Israel | |
| Level Three Communications Kenya Limited | Kenya | |
| Level 3 Communications S.a.r.l. | Luxembourg | |
| OOO "Level 3 Communications" | Russian Federation | |
| SAC Brasil Comunicações Ltda. | Brazil | |
| SAC Brasil Holding Ltda. | Brazil | |
| SAC Peru S.R.L. | Peru | |
| TelCove of Pennsylvania, LLC | Delaware | |
| TelCove Operations, LLC | Delaware | |
| The IRC Company, Inc. | Delaware | |
| Vyvx, LLC | Delaware | |
| Williams Communicaciones Chile Limitada | Chile | |
| WilTel Communications (Cayman) Limited | Cayman Islands | |
| WilTel Communications Network, Inc. | New Brunswick | |
| WilTel Communications Pty Limited | New South Wales | |
| WilTel Communications, LLC | Delaware | |
| WilTel International Telecom (Chile) Limited | Cayman Islands | |
| XCOM Technologies of New York, Inc. | New York | |
| Xspedius Management Co. International, LLC | Delaware | |