WASHINGTON, D.C., November 7, 2005 - Cogent Communications Group, Inc. (AMEX: COI), a multinational Tier 1 Internet service provider, announced today that RUNNet, the federal network of universities across Russia, has selected Cogent as its Internet service provider. The network will be connected to Cogent through Cogent's point of presence in Amsterdam. Cogent's IP network spans over 46,600 Km and has over 85 points of presence in 12 countries. Cogent has been named the largest Ethernet Internet service provider in the United States by Ovum-RHK and continues to demonstrate its leadership position within the telecom industry.

RUNNet was put in place to provide Russian universities with a best-of-breed communications links to the Internet to facilitate the exchange of curriculum materials, studies and research data, and help RUNNet collaborate on research projects with other Russian and foreign universities.

"We needed a large amount of bandwidth to exchange large volumes of data reliably between our universities," said Yury Izhvanov First Deputy Director RUNNet. "After evaluating several providers, Cogent proved to be one of the best and the most cost effective solutions. Since so many American university networks like The Quilt, SURA, OARnet, MichNet are already connected to Cogent, it became an obvious choice for us."

"Cogent has had significant success as the Internet Service Provider of choice to the university and scientific research community in the US and Canada. It is a natural progression to extend this reach into other parts of the world and we are proud to welcome RUNNet on our network," said Dave Schaeffer, CEO of Cogent Communications. "The value of Cogent's pricing for Tier 1 Internet service provides the university community with ample bandwidth to meet the most cutting-edge and demanding needs of research today, without engulfing their IT budgets."

About Cogent Communications

Cogent Communications (AMEX: COI) is the number one provider of Ethernet services in the United States as ranked by Ovum-RHK and is one of the largest ISPs in the world. Its facilities based, all-optical network delivers ultra-high speed Internet access and transport services to businesses and service providers in major metropolitan areas. Cogent offers services across its 46,600 Km IP network spanning 12 countries located in North America and Europe.

The combination of technology, IP network architecture and unique business model has combined to help make Cogent one of the most popular Tier 1 providers of reliable, cost-effective Internet service in the industry. Cogent offers several focused services that complement its On-Net Internet access service including dedicated Off-Net (E1, E3) Internet service, colocation services in 28 colocation facilities across North America and Europe, and Layer 2 Point-to-Point services in every On-Net market.

Cogent Communications is headquartered at 1015 31st Street, NW, Washington, D.C. 20007. For more information, visit www.cogentco.com. Cogent Communications can be reached in the United States at (202) 295-4200 or via email at Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser..

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Information in this release may involve expectations, beliefs, plans, intentions or strategies regarding the future. These forward-looking statements involve risks and uncertainties. All forward-looking statements included in this release are based upon information available to Cogent Communications Group, Inc. as of the date of the release, and we assume no obligation to update any such forward-looking statement. The statements in this release are not guarantees of future performance and actual results could differ materially from our current expectations. Numerous factors could cause or contribute to such differences. Some of the factors and risks associated with our business are discussed in Cogent's registration statements filed with the Securities and Exchange Commission and in its other reports filed from time to time with the SEC.

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