NORDUnet is an international collaboration between the National research and education networks in the Nordic countries.

NORDUnet has peering in multiple important internet exchange sites outside the Nordics, such as Amsterdam, Chicago, Frankfurt, London, Miami and New York.

[5] NORDUnet is one of the members, alongside Internet2, ESnet, SURFnet, CANARIE and GÉANT, to pilot a 100G intercontinental connection between Europe and North America.

[7] It was the first European NREN to embrace the TCP/IP technology and to connect to the National Science Foundation Network in the United States providing open access for university students in member countries.

[citation needed] The web site for NORDUNet, nordu.net, is the oldest active domain name.