In computer networking, peering is a voluntary interconnection of administratively separate Internet networks for the purpose of exchanging traffic between the "down-stream" users of each network. Peering is settlement-free, also known as "bill-and-keep," or "sender keeps all," meaning that neither party pays the other in association with the exchange of traffic; instead, each derives and retains revenue from its own customers.
The London Internet Exchange ("LINX") is a mutually governed Internet exchange point (IXP) that provides peering services and public policy representation to network operators. It was founded in 1994 in London. LINX operates IXPs in London, Manchester, Scotland and Wales in the United Kingdom and Northern Virginia in the United States.
Internet exchange points are common grounds of IP networking, allowing participant Internet service providers (ISPs) to exchange data destined for their respective networks. IXPs are generally located at places with preexisting connections to multiple distinct networks, i.e., datacenters, and operate physical infrastructure (switches) to connect their participants. Organizationally, most IXPs are each independent not-for-profit associations of their constituent participating networks. The primary alternative to IXPs is private peering, where ISPs directly connect their networks to each other.
LyonIX is the Internet eXchange point (IXP) of Lyon. LyonIX is managed by Rezopole, the non-profit organization supported by the Métropole de Lyon and the Auvergne – Rhône-Alpes region.
The MAE was the first Internet Exchange Point (IXP). It began in 1992 with four locations in Washington, D.C., quickly extended to Vienna, Reston, and Ashburn, Virginia; and then subsequently to New York and Miami. Its name stood for "Metropolitan Area Ethernet," and was subsequently backronymed to "Metropolitan Area Exchange, East" upon the establishment of MAE-West in 1994. The MAE predated the National Information Infrastructure plan, which called for the establishment of IXPs throughout the United States. Although it initially had no single central nexus, one eventually formed in the underground parking garage of an office building in Vienna, VA.
The Toronto Internet Exchange Community (TorIX) is a not-for-profit Internet Exchange Point (IXP) located in a carrier hotel at 151 Front Street West, Equinix's TR2 data centre at 45 Parliament Street and 905 King Street West in Toronto, Ontario, Canada. As of March 2021, TorIX has 259 unique autonomous systems representing 285 peer connections and peak traffic rates of 1.344 Tbps, making it the largest IXP in Canada. According to Wikipedia's List of Internet Exchange Points by Size, TorIX is the 16th largest IXP in the world in numbers of peers, and 17th in the world in traffic averages. The Exchange is organized and run by industry professionals in voluntary capacity.
The SwissIX Internet Exchange (SwissIX) is an Internet Exchange Point (IXP) situated in Switzerland, currently in the following cities: Basel, Bern, Glattbrugg, Lupfig, Zürich. SwissIX is a fast-growing, non-profit, neutral and independent peering network. On 9 March 2001 SwissIX was established as an Association in Glattbrugg, operating under Swiss Law.
MSK-IX is an Internet eXchange Point (IXP) with headquarters in Moscow, Russia. With over 549 connected networks and 3,37Tbps of peak traffic, MSK-IX is one of the world's largest IXPs. According to the Internet Exchange Report by Hurricane Electric Internet Services, MSK-IX is the second in Russia and is one of the seven largest in the world by the numbers of members.
DE-CIX is an operator of carrier- and data-center-neutral Internet Exchanges, with operations in Europe, North America, Africa, the Middle East, India and Southeast Asia. All DE-CIX activities and companies are brought together under the umbrella of the DE-CIX Group AG.
The London Access Point (LONAP) is a London-based Internet exchange point (IXP) founded in 1997 as a membership organisation and currently has over 200 members, making it the second largest IXP in the UK and around the 15th largest IXP in the world by membership. LONAP currently operates an Arista Networks infrastructure with multiple 100 and 400 Gbit/s links between their sites, specifically:
Caribe.Net, also known as Critical Hub Networks, is a telecommunications company that provides broadband internet access, data center and telephone services in Puerto Rico. The company is headquartered in San Juan. On April 26, 2010 the company received a $25.7 million federal award from the National Telecommunications and Information Administration for the Puerto Rico Bridge Initiative.
Federal Internet Exchange (FIX) points were policy-based network peering points where U.S. federal agency networks, such as the National Science Foundation Network (NSFNET), NASA Science Network (NSN), Energy Sciences Network (ESnet), and MILNET were interconnected.
PeeringDB is a freely available, user-maintained, database of networks, and the go-to location for interconnection data. The database facilitates the global interconnection of networks at Internet Exchange Points (IXPs), data centers, and other interconnection facilities, and is the first stop in making interconnection decisions.
France-IX is a Paris-based Internet exchange point (IXP) founded in June 2010 as a membership organisation. As of 21 July 2021 it interconnects more than 496 members, making it the largest IXP in France.
Grenoble Internet eXchange or GrenoblIX is the Internet eXchange point (IXP) of Grenoble in Isère and Auvergne – Rhône-Alpes region. GrenoblIX allows to the connected members to exchange the traffic in order to avoid passing by faraway infrastructures. This Internet eXchange point is managed by the non-profit organization Rezopole, founded in 2001.
Mumbai Internet Exchange is a Mumbai-based Internet exchange point (IXP) founded on 15 August 2014 as Mumbai Convergence Hub is an Open Carrier Neutral Internet Exchange & Peering Hub. As of 30 March 2021 it interconnects more than 375 members, making it the largest IXP in India and surrounding region.
The Internet Exchange Point Of Nigeria (IXPN) is a neutral and not-for-profit Internet exchange point (IXP) founded in 2006 by the Nigerian Communications Commission(NCC) in partnership with the Internet Service Providers Association Of Nigeria (ISPAN). Among other things, IXPN was created to reduce connectivity costs in millions of dollars in offshore internet bandwidth payments, reduce latency from 900 milliseconds to 30 milliseconds for local content, serve as the central point for connecting Higher Educational Institutions (HEIs) towards the development of National Research and Educational Network (NREN). As at April 2022, IXPN is the 5th largest IXP in Africa by number of peers, and 3rd in Africa by traffic according to Packet Clearing House’s IXP directory
The Uganda Internet Exchange Point (UIXP) is a non-profit Internet exchange point operator founded in 2001 with the goal of improving Internet connectivity within Uganda and the East African region, and is the only known internet exchange point in Uganda.
United Kingdom, Manchester 
