| Cabase ROS | Rosario | Argentina | 11 | 0 |
| Cabase RST | Resistencia | Argentina | 4 | 0 |
| Cabase SFE | Santa Fe | Argentina | 3 | 0 |
| Cabase SLT | Salta | Argentina | 3 | 0 |
| Cabase SLU | San Luis | Argentina | 2 | 0 |
| Cabase SZP | Sáenz Peña | Argentina | 4 | 0 |
| Cabase TDL | Tandil | Argentina | 4 | 0 |
| Cabase UAQ | San Juan | Argentina | 12 | 0 |
| Cabase VDM | Viedma | Argentina | 2 | 0 |
| Cable & Wireless | Dublin | Ireland | 3 | 0 |
| Cabo Verde Telecom | Praia | Cape Verde | 2 | 0 |
| Caduceus Datacentre | Wellington | New Zealand | 1 | 0 |
| Cambodian SingMeng Telemedia Co., Ltd. | Phnom Penh | Cambodia | 2 | 0 |
| Campana CLS | Thanlyin | Myanmar (Burma) | 1 | 0 |
| CAMPOST Data Center Yaoundé | Yaounde | Cameroon | 3 | 0 |
| Campus DC | Rivne | Ukraine | 2 | 0 |
| Camtel Bepanda | Douala | Cameroon | 5 | 0 |
| Camtel Datacenter Zamengoe-Yaounde | Yaounde | Cameroon | 2 | 0 |
| Camtel Kribi CLS | Kribi | Cameroon | 3 | 0 |
| Canada15Edge Data Center | Toronto | Canada | 3 | 0 |
| Canartel | Khartoum | Sudan | 0 | 0 |
| Cantabria Datacenter | Madrid | Spain | 0 | 0 |
| CapitaLand 9 Tai Seng | Singapore | Singapore | 0 | 0 |
| Capital Online Ma Ju Qiao Datacenter | Beijing | China | 1 | 0 |
| Capital Online Shang Di Datacenter | Beijing | China | 1 | 0 |
| Capital Online Yang Qiao Datacenter | Beijing | China | 1 | 0 |
| Capital Online Zhao Wei Datacenter | Beijing | China | 2 | 0 |
| Capital Outsourcing Beirut | Beirut | Lebanon | 0 | 0 |
| Carolina Internet / CaroNet | Charlotte | United States | 0 | 0 |
| Carolina Internet / CaroNet XB | Charlotte | United States | 1 | 0 |
| CarrierColo Berlin Kitzing (I/P/B/ site K) | Berlin | Germany | 14 | 0 |
| CarrierColo Berlin Luetzow (I/P/B/ site B) | Berlin | Germany | 102 | 0 |
| Carrier Connect Harbour Centre | Vancouver | Canada | 5 | 0 |
| Carrier Connect Waterfront | Vancouver | Canada | 5 | 0 |
| Carrier Core - Tampa | Tampa | United States | 5 | 0 |
| Carrierswitchraum Jena | Jena | Germany | 4 | 0 |
| Casablanca INT s.r.o. | Prague | Czechia | 5 | 0 |
| Cassin1 | Chasseneuil-du-Poitou | France | 3 | 0 |
| Castle-IT Tours | Larcay | France | 1 | 0 |
| Caucasus Online Datacenter - Tbilisi | Tbilisi | Georgia | 3 | 0 |
| CC IN2P3 | Villeurbanne | France | 10 | 0 |
| CDC1 - 350 E Cermak Rd | Chicago | United States | 2 | 0 |
| CDC2 - 600 S Federal st | Chicago | United States | 1 | 0 |
| CDC3 - 800 E Business Center Dr | Mount Prospect | United States | 0 | 0 |
| CDC4 - 1808 Swift Dr | Oak Brook | United States | 2 | 0 |
| CDC5 - 2200 Busse Rd | Elk Grove Village | United States | 0 | 0 |
| CDC Auckland HV1 | Hobsonville, Auckland | New Zealand | 12 | 0 |
| CDC Auckland SD1 | Silverdale, Auckland | New Zealand | 13 | 0 |
| CDC Canberra FY1 | Fyshwick | Australia | 3 | 0 |
| CDC Canberra FY2 | Fyshwick | Australia | 2 | 0 |