| Chemical Engineering News | Academic & Science |
| Central Educational Network | Academic & Science |
| Center for Electron Nanoscopy | Academic & Science |
| Centre d’études Nordiques | Academic & Science |
| Ciudad Obregon | Airport Code |
| EuropeanCommittee for Standardization | Business |
| Central Air | Business |
| Ceridian Corporation | Business |
| Comite Europeen de Normalisation (European Committee for Standardisation) | Community |
| Connecticut Education Network | Community |
| Center for Educational Networking | Community |
| Career and Education Network | Community |
| Commission Europeenne de Normalisation (European Standards Committee) | Computer and Networking |
| Cyber Erotic Noseplay | Computing |
| Consumer Electronics Net | Computing |
| Cloud Enabled Networking | Computing |
| Counter Enable | Computing |
| Central, Hong Kong | Country Specific |
| Customer Enterprise Network | General |
| Cross Eyed Ninja | General |
| Can't Engineer Nothing | General |
| Creative Entertainment Network | General |
| Coinsuper Ecosystem Network | General |
| Chicken Erythrocyte Nuclei | General |
| Cornell Entrepreneur Network | General |
| Comite Europeen de Normalisation | Governmental |
| Chicagoland Environmental Network | Governmental |
| Comité Ejecutivo Nacional | Governmental |
| Comité Européen de Normalisation (in French) European Committee for Standardization | Governmental |
| Comité Europeo de Normalización | International |
| Committee Europeen de Normalisation | International |
| ευρωπαϊκή επιτροπή τυποποίησης | International |
| Certified Emergency Nurse | Jobs |
| centromere | Medical |
| Certificate for Emergency Nursing | Medical |
| Clinical Experimental Network | Medical |
| Committée Européen de Normalisation/European Committee for Standardization | Medical |
| Committee for Standardisation | Medical |
| Community Empowerment Network (!) | Medical |
| Certification in Emergency Nursing | Medical |
| Clinical and Experimental Nephrology | Medical |
| Certified Emergency Nursing | Medical |
| Clinical Emergency Nurse | Medical |
| Central European Norm | Regional |
| Commission for European Normalization | Softwares |
