WASHINGTON, D.C., February 14, 2005 - Cogent Communications Group, Inc. (AMEX: COI), a leading facilities-based provider of low-cost, high speed Internet access and Internet Protocol Communications services today announced that it filed a registration statement on Form S-1 relating to its sale of up to $86.3 million of its common stock in an underwritten public offering. Lehman Brothers is acting as bookrunner in the transaction.

A registration statement relating to these securities has been filed with the Securities and Exchange Commission but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

This offering will only be made by means of a prospectus. When available, a copy of the prospectus concerning the offering may be obtained from Lehman Brothers Inc., c/o ADP Financial

Services, Integrated Distribution Services, 1155 Long Island Avenue, Edgewood, N.Y. 11717, Phone: (631)-254-7106.

About Cogent Communications

Cogent Communications (AMEX: COI) is a multinational, Tier 1 facilities-based ISP that 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 11 countries and provides IP services in markets located in North America and Europe.

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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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