- CAaNES, LLC [RiskSense, Inc]
- COMSATS Institute of Information Technology [Islamabad]
- Carleton University
- Centre National de la Recherche Scientifique
- Centre for Communication Systems Research
- Centre of Telematics and Information Technology
- Centro de Informatica UFPE [Recife]
- Cisco Systems France
- Cisco Systems France Siège Social
- ComNets
- Communication Research Center
- Computer Engineering and Informatics Department
- Computer Science Department [Boston]
- Computer Science Department- University of Oklahoma
- Computer Technology Institute
- Computer Technology Institute and Press "Diophantus"
- Consiglio Nazionale delle Ricerche [Pisa]
- Consorzio Nazionale Interuniversitario per le Telecomunicazioni [Roma]