CARNet is active member of several international organisations:
- Trans - European Research and Education Networking Association (TERENA)
- The Internet Corporation for Assigned Names and Numbers (ICANN)
- Réseaux IP Européens (RIPE)
- Council of European National Top-Level Domain Registries (CENTR)
- Forum of Incident Response and Security Teams (FIRST)
- NREN Consortium
Terena (Trans-European Research and Education Networking Association) was founded in October 1994 by joining of RARE (Réseaux Associés pour la Recherche Européenne) and EARN (European Academic and Research Network).
Since 1993 CARNet has been an active member of this trans-European association of academic and research networks which gathers more than 30 European countries with the aim of providing a platform for the development of information and network infrastructure within the European academic and research community.
The Internet Corporation for Assigned Names and Numbers - ICANN is a non-profit organisation for co-ordination of the domain system, allocation of IP addresses, allocation of protocol parameters, etc.
CARNet joined ICANN membership in 1998.
RIPE is a non-profit organisation whose members are the European Internet Service Providers. The membership is free and voluntary. The main aim is to provide the necessary administrative and technical co-ordination related to the allocation of IP addresses in Europe. CARNet became a RIPE member in 1992.
CENTR is an association which gathers organisations in charge of administrating top-level domains in certain countries (.uk for the United Kingdom, .es for Spain, .hr for Croatia, etc.).
CENTR was founded in March 1998, and in 1999 it was legally registered as a non-profit organisation.
CARNet joined its membership in 1999.
Forum of Incident Response and Security Teams (FIRST) is an international association of teams from the field of computer security which are dealing with resolving computer security incidents and with their prevention.
It was founded in 1990 and has around 80 members.
CARNet became a member in 1996.
NREN Consortium is a consortium of 34 European academic and research networks that participate in the European Union project - GEANT. It was started in November 2000 in co-operation with the European Commission and the National Academic and Research Networks of Europe, with the aim of constructing a pan-European gigabit research network over the following four years.
CARNet joined NREN Consortium in 2001.