WASHINGTON, D.C. May 17, 2011 – Cogent Communications Group, Inc. (NASDAQ: CCOI), one of the largest Internet service providers in the world, today announced that Dave Schaeffer, Cogent's chief executive officer, will present at the following conferences:

The Barclays Capital 2011 Global Communications, Media and Technology Conference is being held at the Crowne Plaza Times Square Manhattan Hotel. Dave Schaeffer will be presenting on Wednesday, May 25th at 1:45 p.m. ET.

The Cowen and Co. 39th Annual Technology Media & Telecom Conference is being held at The New York Palace Hotel in New York, NY. Dave Schaeffer will be presenting at 3:05 PM ET on Wednesday, June 1st.

Investors and other interested parties may access a live audio webcast of the conference presentations by going to the Events section of Cogent's website (http://www.cogentco.com/events) to access the link to the live audio webcasts. A replay of the webcasts will be available on Cogent's website for 90 days following the presentations.

About Cogent Communications

Cogent Communications (NASDAQ: CCOI) is a multinational, Tier 1 facilities-based ISP, consistently ranked as one of the top five networks in the world. 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 165 markets located in North America and Europe.

Since its inception, Cogent has unleashed the benefits of IP technology, building one of the largest and highest capacity IP networks in the world. This network enables Cogent to offer large bandwidth connections at highly competitive prices. Cogent also offers superior customer support by virtue of its end-to-end control 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 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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