WASHINGTON, D.C., September 15, 2003 - Cogent Communications Group, Inc. (AMEX: COI), a Tier One, optical Internet service provider, announced today the launch of a new pre-paid, low-cost product for service provider customers. For only $1,000 a month, Cogent's new 10 Megabit connections are designed for small- to medium-sized service providers who do not have long-term credit histories, but who need high quality Internet access at an affordable price. Making the product available on a pre-paid basis enables Cogent customers to initiate service more quickly and easily than through other ISPs.

"Only $1,000 for 10Mb will carry significant appeal to the small operators. Not only will they get Tier 1 Internet access from one of the most reliable ISPs in the country, they also get the lowest price per megabit in over 200 colocation facilities across the United States," said Bruce Wagner, Vice President of Sales for Cogent.

"Cogent's technologically advanced network combined with end-to-end network ownership gives our customers unparalleled performance and reliability," Brad Kummer, CTO of Cogent. "By adding a pre-paid service option, Cogent is giving customers and prospects greater flexibility in their choice for Internet access."

The Prepay 10 Megabit service will be available in over 200 carrier-neutral colocation centers across the United States. Some of the top colocation centers in the country that provide access to Cogent's radically priced, quality driven Internet service include Navisite, Equinix, PAIX , LayerOne and Switch & Data to name a few.

Specific terms of the offer will be posted on Cogent's website at www.cogentco.com/products/prepay within 30 days. Details are available to the media upon request.

About Cogent Communications

Cogent Communications (AMEX: COI) is a Tier 1, facilities based, all-optical ISP focused on delivering ultra-high speed Internet access and transport services to businesses in the multi-tenant marketplace and to service providers located in major metropolitan areas across the United States and Canada. Cogent's simple product set includes dedicated, non-oversubscribed bandwidth in 10 Mb, 100 Mbps and 1,000 Mbps levels in colocation centers across the United States and Canada. These connections are delivered over Cogent's 80 Gbps backbone, making Cogent's network the largest of its kind in the United States.

The Cogent solution offers the elusive combination of higher quality and reliability at a lower price. Advanced technology, combined with network ownership has made Cogent's ultra-high speed Internet access an affordable reality for small and medium-sized businesses, as well as a significant cost saver for the largest enterprises and service providers.

Cogent's network consists of a dedicated nationwide multiple OC-192 fiber backbone, multiple intra-city OC-48 fiber rings, and optically-interfaced high-speed routers. Cogent has been recognized as the first IP Optical Cisco Powered Network (CPN). Cogent has made several significant acquisitions including the majority of the U.S. operations of PSINet which resulted in the acquisition of their three data centers located in NY, LA and Herndon, VA. Cogent is now offering service in over 30 metropolitan markets with bandwidth ranging from T1 to 1,000 Mbps as well as colocation services in the data center locations.

Cogent Communications is headquartered at 1015 31st Street, NW, Washington, D.C. 20007. For more information, visit www.cogent-sp.com. Cogent Communications can be reached 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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