AboveNet Announces StarLight 10 Gig Network

DuPage National Technology Park Celebrates Opening

NEW YORK, September 26, 2005 – AboveNet, Inc, a premier metro network access provider of custom fiber connectivity solutions for business, today announced the kick off of the StarLight 10 Gigabit Ethernet Network located at the DuPage National Technology Park in West Chicago, Illinois.

StarLight embraces a global scientific community conducting advanced networking, database applications, visualization and computing research using IP over wave division networks. StarLight was developed by the Electronic Visualization Lab at the University of Illinois at Chicago, the International Center for Advanced Internet Research (iCAIR) at Northwestern University, and the Mathematics and Computer Science Division at Argonne National Laboratory.

AboveNet is proud to supply fiber optic network facilities to the DuPage National Technology Park. “The contribution made by AboveNet to the DuPage National Technology Park is part of a continuing effort on the part of AboveNet to be an instrumental player in providing ultra-broadband facilities to the higher education and scientific research community,” said Joc Jacquay, Senior Vice President of Sales and Marketing for AboveNet. “The research and development that will be conducted at DuPage National will play a key role in future Internet services and is critical for the continued technological leadership of North American based institutions.”

CenterPoint Properties Trust, a Chicago-based real estate investment trust (NYSE: CNT), is developing the 800-acre mixed-use business park. For more information on DuPage National Technology Park, visit www.dntp.com.

About AboveNet, Inc.
AboveNet, Inc. provides fiber connectivity solutions for businesses. Its private optical network delivers key network and IP services in and between 14 top U.S. metro markets and London. AboveNet’s network is widely used in demanding markets such as financial services, where the majority of top investment banks and five of the top 10 U.S. banks rely on AboveNet for mission critical services.

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This news release contains forward-looking statements that involve risks and uncertainties. Factors that could cause or contribute to such risks and uncertainties include, but are not limited to, general economic and business conditions, competition, changes in technology and methods of marketing, and various other factors beyond the Company’s control. This also includes such factors as are described from time to time in the SEC reports filed by AboveNet, Inc. including the most recently filed Forms S-3 and 8-K.