GÉANT

GÉANT, short for Gigabit European Academic Network, is the pan-European data-networking initiative serving research and education communities. Rather than operating as a consumer internet service or a conventional commercial telecommunications brand, it provides a coordinated infrastructure and service environment for national research and education networks, universities, laboratories, cultural institutions, and other eligible academic users. The network is built and operated through the GÉANT Association with co-funding from the European Commission and Europe's national research and education networks. The initiative began in November 2000 and entered full production service in December 2001, replacing the earlier TEN-155 network. Its purpose was to provide European researchers with a high-capacity, interoperable backbone that could support collaboration across national borders. The project later developed through successive generations, including GÉANT2, GN3, GN3plus, and the GN4 series. The current phase belongs to the GN5 family under the Horizon Europe framework, with GN5-1 running from January 2023 through December 2024 and GN5-2 beginning in January 2025. GÉANT combines a large European backbone with services that address the practical requirements of distributed research. The network spans roughly 50,000 kilometres and supports high-bandwidth traffic, dedicated or dynamically provisioned circuits, identity and trust services, federated access, multi-domain monitoring through perfSONAR, and roaming connectivity through eduroam. Its infrastructure is intended to let researchers work across institutions and countries without having to manage separate network arrangements for every collaboration. The ecosystem connects approximately 50 million users at more than 10,000 institutions, according to the referenced description of the network. A major feature of GÉANT is its role as both production infrastructure and a technology testbed. It pioneered an internationally deployed hybrid architecture combining routed IP services with switched capacity. This allows ordinary research traffic to coexist with virtual private paths and dedicated network resources for demanding projects, including large-scale physics experiments. GÉANT has supported native IPv6 since 2002 and multicast IPv6 since 2004, and it has participated in research involving photonic switching, carrier-class networking, federated architectures, and virtualization. A major migration completed in 2013 enabled multiple 100-gigabit-per-second links, a core design supporting 500-gigabit-per-second capacity, and a roadmap toward substantially higher throughput. GÉANT is also globally connected. Through relationships with networks such as Internet2 and ESnet in North America, AfricaConnect, TEIN in the Asia-Pacific region, RedCLARA in Latin America, and other regional research networks, it supports collaboration among researchers in more than half of the world's countries. These links contribute to projects in high-energy physics, biomedical science, health, radio astronomy, earth observation, weather and disaster warning, telemedicine, and arts and culture. The network's public-interest role includes helping institutions in less-developed regions participate in international research while reducing the need for researchers to relocate. The brand therefore represents a shared European research infrastructure rather than a single retail product. Its value proposition is based on scale, trust, interoperability, specialist performance, and public research impact. GÉANT's continuing project cycles reflect an institutional model in which European policy funding and national network organizations jointly evolve the infrastructure in response to changing scientific and technological requirements.

GÉANT emerged from Europe's effort to create a dedicated, continent-wide network for research and education. The project started in November 2000 and entered full production operation in December 2001, replacing TEN-155. Its creation reflected the growing need for universities, laboratories, and national research networks to exchange large volumes of data and collaborate across borders using infrastructure designed for research rather than general commercial internet traffic. The first GÉANT phase was initially expected to end in October 2004, but it was extended until April 2005. The second-generation network, GÉANT2, began in September 2004 and operated through 2009. During that period, the initiative expanded to connect 30 national networks across 34 countries, strengthening the role of coordinated European infrastructure in international research. In April 2009, the GN3 project succeeded GÉANT2. GN3 continued until April 2013 and was followed by GN3plus, a further project phase planned for two years. These projects were supported through the European Commission's Seventh Framework Programme for research and technological development. The successive project model enabled the network to evolve through defined funding and development cycles while retaining continuity for its users and participating national networks. The GN4 series followed under the seven-year Horizon 2020 Framework Partnership Agreement. It was delivered through the GN4-1, GN4-2, and GN4-3 projects, each contributing to the modernization of the network, its services, and its research collaborations. The project then moved into the GN5 series under the seven-year Horizon Europe Framework Partnership Agreement. GN5-1 ran from January 2023 to December 2024, and GN5-2 began in January 2025. Throughout its history, GÉANT has combined production connectivity with experimentation. Its hybrid network model brought together routed IP infrastructure and switched capacity, allowing general traffic to operate alongside controlled, dedicated, or virtual private paths. This was particularly useful for scientific collaborations with exceptional requirements for bandwidth, security, and flexibility, including the Large Hadron Collider community. GÉANT supported native IPv6 from 2002 and multicast IPv6 from 2004, and it became involved in research on photonic switching, carrier-class network technologies, federated network architectures, and virtualization. A substantial migration programme completed in 2013 enabled multiple 100-gigabit-per-second links. The core network was designed to support 500-gigabit-per-second capacity and to scale toward terabit-level performance. The backbone also became a platform for large-scale data movement, with the referenced material describing daily transfers exceeding one petabyte. GÉANT's reach expanded beyond Europe through links with peer research and education networks in North America, Latin America, Africa, the Middle East, Central Asia, the South Caucasus, and the Asia-Pacific region. These connections support international science as well as public-interest applications such as e-health, telemedicine, weather forecasting, and disaster-warning systems. They also help institutions in less-developed regions participate in global research without requiring all activity to move to wealthier countries. The network is built and operated by the GÉANT Association in collaboration with national research and education networks. The referenced description identifies a broad partnership involving European NRENs, Nordic and Israeli representation, and associate members; project membership and counts have varied by project phase. Today, GÉANT remains an active shared infrastructure supporting approximately 50 million users at more than 10,000 institutions and connecting European research networks to partners around the world.

• 2025

  GN5-2 begins

  [1]GÉANTen.wikipedia.org

  The current GN5-2 project phase started in January 2025.

• 2023

  GN5-1 begins

  [1]GÉANTen.wikipedia.org

  The first GN5 project phase began under the Horizon Europe framework partnership.

• 2013

  Major network migration completed

  [1]GÉANTen.wikipedia.org

  A major migration programme enabled multiple 100-gigabit-per-second links and a core design supporting 500-gigabit-per-second capacity.

• 2009

  GN3 project begins

  [1]GÉANTen.wikipedia.org

  GN3 started on 1 April 2009, succeeding the GÉANT2 project.

• 2004

  GÉANT2 generation starts

  [1]GÉANTen.wikipedia.org

  GÉANT2 began in September 2004 as the next generation of the European research network.

• 2004

  Multicast IPv6 support

  [1]GÉANTen.wikipedia.org

  The network added multicast IPv6 support.

• 2002

  Native IPv6 support

  [1]GÉANTen.wikipedia.org

  The network began supporting native IPv6 connectivity.

• 2001

  Full production operation begins

  [1]GÉANTen.wikipedia.org

  GÉANT entered full production service in December 2001 and replaced the TEN-155 network.

• 2000

  GÉANT project begins

  [1]GÉANTen.wikipedia.org

  The pan-European research and education networking project was launched in November 2000.

A trusted, high-capacity, non-commercial research and education network that connects European national networks with one another and with peer infrastructures worldwide.

• Research and education network · 2001

  GÉANT backbone network

  The core pan-European infrastructure linking national research and education networks. It provides high-capacity connectivity for universities, laboratories, and other eligible institutions, with a backbone described as extending roughly 50,000 kilometres. Its architecture supports ordinary routed traffic as well as dedicated, switched, or virtual private paths for projects with specialized performance and security requirements.

• Roaming access service

  eduroam

  An international academic roaming service associated with the GÉANT ecosystem. It enables participating students, researchers, and staff to use institutional credentials to obtain network access when visiting participating institutions, reducing the need to create separate guest accounts for every location.

• Network monitoring service

  perfSONAR

  A multi-domain performance-monitoring capability used across research networks. It helps participating organizations measure and diagnose network performance across administrative boundaries, an important function for international science projects whose data paths cross several national infrastructures.

• Network capacity service

  Dynamic circuits

  Services that allow eligible research users or projects to provision specialized network paths with controlled bandwidth and routing characteristics. They are intended for collaborations that need more predictable or dedicated capacity than ordinary shared internet traffic can provide.

• Federated digital infrastructure

  Identity and trust services

  A set of services supporting trusted access across participating institutions and networks. These capabilities allow researchers to use federated institutional identities and support secure collaboration across national and organizational boundaries.

• 2023

  Transition into the GN5 project generationStrategy

  Background

  GÉANT's Horizon 2020 project sequence was followed by a new framework under Horizon Europe.

  Action taken

  GN5-1 began in January 2023, followed by GN5-2 in January 2025.

  Aftermath

  The successive project phases maintained the network's long-term development and European research-infrastructure mission.

  Source

• 2013

  Completion of major capacity migrationStrategy

  Background

  Increasing scientific data volumes and more demanding research applications required substantially greater backbone capacity.

  Action taken

  GÉANT completed a major network migration that enabled multiple 100-gigabit-per-second links and a core design supporting 500-gigabit-per-second capacity.

  Aftermath

  The network gained a higher-capacity platform for data-intensive projects and a design intended to scale toward multi-terabit performance.

  Source

• 2009

  Launch of the GN3 project seriesGeneration change

  Background

  The project required a further development cycle after GÉANT2 to continue expanding and modernizing European research connectivity.

  Action taken

  GN3 began on 1 April 2009, followed later by the GN3plus extension.

  Aftermath

  The project continued the managed, framework-funded evolution of the network and its associated services.

  Source

• 2004

  Move from the original GÉANT network to GÉANT2Generation change

  Background

  The first-generation project and the earlier TEN-155 infrastructure were no longer sufficient for the growing scale and international requirements of academic networking.

  Action taken

  GÉANT2 began in September 2004 as the next-generation network and expanded the connected national infrastructure.

  Aftermath

  By the end of the GÉANT2 period, the network had grown to cover 30 national networks in 34 countries.

  Source

1. 1GÉANTen.wikipedia.org
2. 2GÉANT official websitegeant.org