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Cogent Communications CEO to Present at Jefferies' 5th Annual Communications Conference

WASHINGTON, D.C., August 29, 2007 - Cogent Communications Group, Inc. (NASDAQ: CCOI), the largest Ethernet Internet service provider in the United States, today announced that Dave Schaeffer, chief executive officer, will present at Jefferies' 5th Annual Communications Conference being held in New York City on September 11th.

Mr. Schaeffer's presentation is scheduled for 1:50 pm, EDT.

Investors and other interested parties may access a live audio webcast of the presentation by going to the Investor Relations section of Cogent's website (http://www.cogentco.com/htdocs/events.php) to access the link to the live audio webcast. A replay of the webcast will be available on Cogent's IR website for 30 days following the presentation.

About Cogent Communications

Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP. Cogent specializes in providing businesses with high speed Internet access and point-to-point transport services. Cogent's facilities-based, all-optical IP network backbone spans 19 countries and provides IP services in over 100 markets located in North America and Europe.

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 This email address is being protected from spambots. You need JavaScript enabled to view it..

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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 our registration statements filed with the Securities and Exchange Commission and in our other reports filed from time to time with the SEC.

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