WASHINGTON, D.C., December 15, 2004 - Cogent Communications Group, Inc. (AMEX: COI), a leading Tier 1 optical Internet service provider, announced it is offering customers and prospects two levels of Managed Security services to further enhance their dedicated Internet access connection. Available immediately, Cogent's Advanced and Premium level services are designed to protect customers' Internet connections against today's very real threat of disruption due to security breaches and viruses.

Cogent will offer this service to customers through an agreement with Tekmark Global Solutions ("TGS"), a well-known third party provider of security services. Cogent will maintain the direct customer relationship and handle all issues and requests related to the managed security service.

"A trusted partner, TGS will provide the expertise and hands-on management skills necessary to run what will operate very much like a division of Cogent Communications," said Dave Schaeffer, CEO of Cogent. "This will enable Cogent to remain focused on its core competency, which is Internet connectivity and transport services, and let us provide business customers with a level of security that will safeguard them against external threats that present themselves all too often in the business community."

Cogent designed its security offerings to fit in line with its philosophy that simplicity leads to success. Cogent's business model includes simplified pricing (flat rate pricing), a focused set of products, and simplified contracts with month-to-month or annual terms. By offering simplified solutions, Cogent maintains a highly efficient back office to support billing and customer service and it also enables Cogent to provide a high-degree of protection at a very competitive price.

There are two levels of service targeted specifically at Cogent's small- and medium-sized demographic – Advanced and Premium. For $199 a month, Advanced level customers receive a firewall powered by Internet security leader SonicWALL, which allows an unlimited number of user devices behind the firewall. Also included are VPN remote client licenses, 24x7x365 customer support and online reporting via a web portal. Premium level customers receive everything above plus content filtering and desktop anti-virus services for $259 a month. All equipment is pre-configured to meet customer requirements and shipped directly to the customer.

Service is being launched across the United States and Canada and will be available to Cogent's SME business customers who connect at speeds from 1.5 Mbps to 100 Mbps.

About Cogent Communications

Cogent Communications (AMEX: COI) is a next generation, multinational, Tier 1 ISP. Its facilities based, all-optical network delivers ultra-high speed Internet access and transport services to businesses and service providers in major metropolitan areas. Cogent offers services across its 30,300-mile IP network spanning 11 countries located in North America and Europe.

Since opening its doors in 1999, Cogent's elusive combination of high quality, reliable, low cost bandwidth and superior customer support have enabled Cogent to become one of the fastest growing ISPs in the industry. Cogent was recently ranked as the number one fastest growing company in 2004 in the Washington, DC area by the Washington Business Journal.

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 Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!.

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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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