- CESNET [Prague]
- Cardiff University
- Catholic University of Leuven = Katholieke Universiteit Leuven
- Center for Quantifiable Quality of Service in Communication Systems
- Center for REsearch And Telecommunication Experimentation for NETworked communities
- Center for Research and Advanced Studies of the National Polytechnic Institute
- CentraleSupélec
- Centre National de la Recherche Scientifique
- Centre for Quantifiable Quality of Service in Communication Systems
- Centre for Quantifiable Quality of Service in Communication Systems (Q2S)
- Centre of Telematics and Information Technology