WASHINGTON, D.C., November 14, 2005 - Cogent Communications Group, Inc. (AMEX: COI), the largest Ethernet Internet service provider in the United States, announced today that Dave Schaeffer, Cogent's Chief Executive Officer, will be speaking at the Lehman Brothers Small Cap Conference on November 16, 2005 at 10:00 a.m. PST. The event will be held at the Four Seasons Resort Aviara in Carlsbad, California.

Mr. Schaeffer's presentation will be webcast and available to the public by going to http://www.cogentco.com/htdocs/presentations.php and following the link to the webcast page.

About Cogent Communications

Cogent Communications (AMEX: COI) is a multinational, Tier 1 facilities-based ISP recently 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 12 countries and provides IP services in over 85 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..

# # #

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.

###