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'''Cogent Communications''' is a multinational [[internet service provider]] based in the United States. Cogent's primary services consist of Internet access and data transport, offered on fiber optic, IP data-only network, along with colocation in data centers.
Cogent's [[Autonomous system (Internet)|AS]] (174) has one of the highest-ranked connectivity [[degree (graph theory)|degrees]] on the Internet.<ref>[http://www.caida.org/research/topology/as_core_network/ Visualizing Internet Topology at a Macroscopic Scale] April 2005</ref><ref>[http://as-rank.caida.org/ AS ranking]</ref>
==Acquisition history==
Cogent was founded in 1999 at the peak of the industry's growth. In three years, Cogent acquired 13 other carriers, purchasing $14 billion in capital for $60 million, including $4 billion worth of Property, Plant and Equipment.<ref>[http://lw.pennnet.com/display_article/308794/13/ARTCL/none/none/Cogent-Communications-banks-on-Ethernet-over-IP/ Lightwave - Cogent Communications banks on Ethernet over IP<!-- Bot generated title -->]</ref>
*September 2001 - Acquires the assets of [[NetRail]]
*February 2002 - Acquires [[Allied Riser]]
*April 2002 - Acquires Building Access Agreements from [[OnSite Access]]
*April 2002 - Acquires Major US Assets of [[PSINet]]
*September 2002 - Acquires Major Assets of [[FiberCity Networks]]
*February 2003 - Acquires [[Fiber Network Solutions]]
*May 2003 - Acquires Assets of [[Applied Theory]]
*January 2004 - Acquires [[LambdaNet]] France & Spain
*March 2004 - Acquires Fiber Network and Equipment in Germany Out of Former [[Carrier1]] Assets
*September 2004 - Acquires [[Global Access]]
*October 2004 - Acquires [[Aleron Broadband]]
*December 2004 - Acquires [[NTT/Verio]] Dedicated Access Business in U.S.
==Controversies==
Cogent has been the subject of numerous peering disputes. On April 28, 2011, [[Communications Network Services]] engineer [[Phil Benchoff]] noticed that Cogent, Virginia Tech's commodity Internet provider, had depeered with both Google and Hurricane Electric, a major provider of IPv6 transit, causing some IPv6 routes to become available only over [[Internet2]]. <ref>[http://www.gossamer-threads.com/lists/nsp/ipv6/29238 Cogent and Google no longer peered via IPv6]</ref> On a [[w:NANOG|NANOG]] mailing list, a HE employee blamed Cogent for refusing to peer.<ref>[http://mailman.nanog.org/pipermail/nanog/2009-October/014017.html IPv6 internet broken, cogent/telia/hurricane not peering]</ref>
==References==
{{reflist}}
==External links==
*[http://www.cogentco.com/ Official site]
[[Category:Blacksburg ISPs]]
Cogent's [[Autonomous system (Internet)|AS]] (174) has one of the highest-ranked connectivity [[degree (graph theory)|degrees]] on the Internet.<ref>[http://www.caida.org/research/topology/as_core_network/ Visualizing Internet Topology at a Macroscopic Scale] April 2005</ref><ref>[http://as-rank.caida.org/ AS ranking]</ref>
==Acquisition history==
Cogent was founded in 1999 at the peak of the industry's growth. In three years, Cogent acquired 13 other carriers, purchasing $14 billion in capital for $60 million, including $4 billion worth of Property, Plant and Equipment.<ref>[http://lw.pennnet.com/display_article/308794/13/ARTCL/none/none/Cogent-Communications-banks-on-Ethernet-over-IP/ Lightwave - Cogent Communications banks on Ethernet over IP<!-- Bot generated title -->]</ref>
*September 2001 - Acquires the assets of [[NetRail]]
*February 2002 - Acquires [[Allied Riser]]
*April 2002 - Acquires Building Access Agreements from [[OnSite Access]]
*April 2002 - Acquires Major US Assets of [[PSINet]]
*September 2002 - Acquires Major Assets of [[FiberCity Networks]]
*February 2003 - Acquires [[Fiber Network Solutions]]
*May 2003 - Acquires Assets of [[Applied Theory]]
*January 2004 - Acquires [[LambdaNet]] France & Spain
*March 2004 - Acquires Fiber Network and Equipment in Germany Out of Former [[Carrier1]] Assets
*September 2004 - Acquires [[Global Access]]
*October 2004 - Acquires [[Aleron Broadband]]
*December 2004 - Acquires [[NTT/Verio]] Dedicated Access Business in U.S.
==Controversies==
Cogent has been the subject of numerous peering disputes. On April 28, 2011, [[Communications Network Services]] engineer [[Phil Benchoff]] noticed that Cogent, Virginia Tech's commodity Internet provider, had depeered with both Google and Hurricane Electric, a major provider of IPv6 transit, causing some IPv6 routes to become available only over [[Internet2]]. <ref>[http://www.gossamer-threads.com/lists/nsp/ipv6/29238 Cogent and Google no longer peered via IPv6]</ref> On a [[w:NANOG|NANOG]] mailing list, a HE employee blamed Cogent for refusing to peer.<ref>[http://mailman.nanog.org/pipermail/nanog/2009-October/014017.html IPv6 internet broken, cogent/telia/hurricane not peering]</ref>
==References==
{{reflist}}
==External links==
*[http://www.cogentco.com/ Official site]
[[Category:Blacksburg ISPs]]