| Cincinnatti Bell - West 7th Street | Cincinnatti Bell | Cincinnati | United States | 0 | 0 |
| Cirion Bogota - BOG1 | Cirion | Bogota | Colombia | 6 | 0 |
| Cirion Bogota - BOG2 | Cirion | Bogota | Colombia | 2 | 0 |
| Cirion Buenos Aires - BUE1 | Cirion | Buenos Aires | Argentina | 75 | 4 |
| Cirion Cordoba - COR1 | Cirion | Córdoba | Argentina | 3 | 0 |
| Cirion Curitiba - CUR1 | Cirion | Curitiba | Brazil | 20 | 1 |
| Cirion Fortaleza | Cirion | Fortaleza | Brazil | 21 | 1 |
| Cirion La Urbina | Cirion | La Urbina | Venezuela | 17 | 1 |
| Cirion Lima - LIM1 | Cirion | Santiago de Surco | Peru | 63 | 4 |
| Cirion Mendoza - MEN1 | Cirion | Godoy Cruz | Argentina | 0 | 0 |
| Cirion Porto Alegre | Cirion | Porto Alegre | Brazil | 13 | 1 |
| Cirion Quito - QUI1 | Cirion | Quito | Ecuador | 2 | 0 |
| Cirion Quito - QUI2 | Cirion | Quito | Ecuador | 8 | 1 |
| Cirion Rio de Janeiro - RIO1 | Cirion | Rio de Janeiro | Brazil | 108 | 1 |
| Cirion Rosario - ROS1 | Cirion | Rosario | Argentina | 2 | 0 |
| Cirion Santiago de Chile - SAN1 | Cirion | Santiago | Chile | 67 | 4 |
| Cirion Sao Paulo - SAO1 | Cirion | Cotia | Brazil | 145 | 2 |
| CITIC Telecom CPC Datacenter Tallinn | CITIC Telecom International CPC Limited | Tallinn | Estonia | 8 | 2 |
| CITIC Telecom CPC Netherlands B.V. | CITIC Telecom CPC Netherlands B.V. | Amsterdam | Netherlands | 0 | 0 |
| Citranet DC Surakarta | Jembatan Citra Nusantara | Sukoharjo | Indonesia | 6 | 1 |
| Citranet DC Yogyakarta | Jembatan Citra Nusantara | Sleman | Indonesia | 7 | 1 |
| City Hosting | City Hosting Sweden AB | Stockholm | Sweden | 10 | 2 |
| City of Calgary - City Hall | The City of Calgary | Calgary | Canada | 4 | 1 |
| City Online Servces Ltd , Visakhapatnam | City Online services Limited | Viskhapatnam | India | 0 | 0 |
| City Online Services Limited | City Online services Limited | Hyderabad | India | 2 | 0 |
| City Online Services Ltd , Bengaluru | City Online services Limited | Bangalore | India | 1 | 0 |
| City Online Services Ltd, Vijayawada | City Online services Limited | Vijayawada | India | 1 | 0 |
| Citycom Datacenter Graz | Citycom Telekommunikation GmbH | Graz | Austria | 6 | 0 |
| Citylink Classic House | Citylink Limited | Wellington | New Zealand | 6 | 1 |
| Citynet Bridgeport | Citynet | Bridgeport | United States | 1 | 0 |
| Citynet Charleston | Citynet | Charleston | United States | 2 | 1 |
| Citynet Columbus | Citynet | Columbus | United States | 3 | 1 |
| Citynet Facility | Citynet Marcin Sobala, Piotr Misiuda | Rzeszów | Poland | 0 | 0 |
| CityNet Host | CityNet Telecom | Tenth of Ramadan | Egypt | 1 | 0 |
| Citynet Indianapolis | Citynet | Indianapolis | United States | 1 | 0 |
| Citynet Pittsburgh | Citynet | Pittsburgh | United States | 4 | 0 |
| Civicos Networking - IAAS (MADRID) | Civicos Networking, S.L.U. | Madrid | Spain | 0 | 0 |
| Civicos Networking DCARRECIFE | Civicos Networking, S.L.U. | Arrecife | Spain | 1 | 0 |
| Civicos Networking DCLAGUNA | Civicos Networking, S.L.U. | San Cristóbal de La Laguna | Spain | 2 | 0 |
| Civicos Networking DCROUBAIX | Civicos Networking, S.L.U. | Roubaix | France | 0 | 0 |
| CIX | CORK INTERNET EXCHANGE LIMITED | Cork City | Ireland | 15 | 1 |
| CJ Online Ghaziabad | CJONLINE ISP India | Ghaziabad | India | 0 | 0 |
| CJ1 CYBERJAYA | Mytelehaus | Cyberjaya | Malaysia | 23 | 3 |
| CKW Colo Hochdorf | CKW Fiber Services AG | Urswil | Switzerland | 0 | 0 |
| CKW Colo Sursee | CKW Fiber Services AG | Schenkon | Switzerland | 0 | 0 |
| CKW Colo Wolhusen | CKW Fiber Services AG | Ruswil | Switzerland | 0 | 0 |
| CKW DC LuZ Luzern Nord | CKW Fiber Services AG | Luzern | Switzerland | 2 | 0 |
| CKW DC Rathausen | CKW Fiber Services AG | Emmen | Switzerland | 0 | 0 |
| CKW DC Zug | CKW Fiber Services AG | Rotkreuz | Switzerland | 2 | 0 |
| Clackamas ESD Datacenter | Clackamas ESD | CLACKAMAS | United States | 9 | 1 |