WASHINGTON, D.C., May 23, 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 four conferences on each of May 30th, May 31st, June 1st, and June 4th 2007. The presentations are as follows:

May 30th

Friedman, Billings, Ramsey & Co., Inc's 2007 Growth Conference is being held at the Grand Hyatt New York. Mr. Schaeffer will speak at 2:20 pm ET on Wednesday May 30th. Investors and interested parties may access a live audio webcast of this presentation by going to the Investor Relations section of Cogent's Website located at http://www.cogentco.com/htdocs/events.php.

May 31st

Lehman Brothers' Worldwide Wireless And Wireline Conference is being held at the Crowne Plaza Times Square Hotel in New York City. Mr. Schaeffer will speak at 1:45 pm ET on Thursday, May 31st. Investors and interested parties may access a live audio webcast of this presentation by going to the Investor Relations section of Cogent's Website located at http://www.cogentco.com/htdocs/events.php.

June 1st

Cowen And Company's 35th Annual Smid-Cap Technology Conference is being held at The New York Palace Hotel. Mr. Schaeffer will speak at 9:20 am ET on Friday June 1st. Investors and interested parties may access a live audio webcast of this presentation by going to the Investor Relations section of Cogent's Website located at http://www.cogentco.com/htdocs/events.php.

June 4th

Deutsche Bank's 15th Annual Media/Telecom Conference is being held at The New York Palace Hotel. Mr. Schaeffer will speak at 3:40 pm on Monday June 4th. Investors and interested parties may access a live audio webcast of this presentation by going to the Investor Relations section of Cogent's Website located at http://www.cogentco.com/htdocs/events.php.

A replay of all the webcasts will be available on the Investor Relations section of Cogent's website for 30 days following the presentation.

About Cogent Communications

Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP ranked by Ovum-RHK as the largest provider of Ethernet services in the United States. Cogent is also ranked as the 56th fastest growing company in North America on Deloitte's Technology Fast 500 List for 2006. 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 provides IP services in over 90 markets located in North America and Europe.

Since Cogent's inception, Cogent has unleashed the benefits of IP technology, building one of the largest and highest capacity IP networks in existence. This network enables Cogent to offer large bandwidth connections at highly competitive prices. Cogent also has the ability to offer superior customer support through end-to-end operation of the network, enabling Cogent to control all aspects of service delivery and network monitoring.

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 Esta dirección de correo electrónico está siendo protegida contra los robots de spam. Necesita tener JavaScript habilitado para poder verlo..

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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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