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Cogent Communications to Host First Quarter 2006 Earnings Call on May 11, 2006

WASHINGTON, D.C., April 24, 2006 - Cogent Communications Group, Inc. (NASDAQ-CCOI) will host a conference call at 8:30 a.m. EDT on May 11, 2006 to discuss Cogent's operating results for the first quarter of 2006. Cogent will issue a press release announcing the operating results after the stock market closes on May 10, 2006.

To participate, investors and other interested parties may access the earnings call as follows:

Dial-in Number: 1-800-819-9193 for U.S. callers

1-913-981-4911 for international callers

Internet: An audio webcast is accessible at "Events" under the "Investor Relations" section of Cogent's website at www.cogentco.com.

Telephone Replay: Thursday, May 11, 2006 at 11:30 a.m. EDT and continuing through 12 a.m. EDT on Saturday, May 13.

To listen to the replay, please dial 1-719-457-0820, Access code 4513269

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 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 14 countries and provides IP services in over 95 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. Network ownership also enables Cogent to offer superior customer support through 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 1-202-295-4200 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 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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Cogent Communications

Cogent is one of the world's largest Internet Service Providers, delivering high quality Internet, Ethernet and Colocation services to over 66,980 Enterprise and NetCentric customers. Cogent serves over 198 markets in 41 countries across its facilities-based, all-optical IP network.

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