DSL.net's Affordable, High-Speed Internet Access Alternative Now Available for Louisville Businesses.

Business/Technology Editors

NEW HAVEN, Conn.--(BUSINESS WIRE)--Dec. 23, 1999

DSL.net, Inc. (NASDAQ:DSLN) today announced that Louisville, KY is the latest in a growing number of metropolitan areas to benefit from DSL.net's high-speed Internet access. As a national direct provider of Digital Subscriber Line (DSL) services in Tier II and Tier III cities, DSL.net delivers small- and medium-sized business customers superior Internet connectivity and network services.

DSL technology uses existing copper telephone wire to supply broadband service access to the Internet. Currently, DSL.net offers symmetric DSL (SDSL), providing companies with the same dedicated connection speed for upstream and downstream requirements. DSL is "always on", delivering a constant, immediate connection to the Internet 24 hours a day, seven days a week.

"The availability of DSL.net service in Louisville means that smaller businesses can now take advantage of the same technology that companies in larger cities have been enjoying for some time," said David Struwas, president and chief executive officer of DSL.net. "With connection speeds up to 1.54Mbps, DSL.net gives businesses the bandwidth they need to compete in the Internet economy at a fraction of the cost of other high-speed alternatives."

"As a direct provider of DSL service, DSL.net guarantees the quality of our customers' connections," said Ray Allieri, senior vice president of sales and marketing. "And through a series of peering relationships with other tier one network providers, we're able to put our customers closer to their Web destinations. That translates as faster, more direct connections."

For more information regarding DSL.net solutions and services in Louisville or other markets, please call 1-877-DSL-NET1 (1-877-375-6381) or visit www.dsl.net.

About DSL.net

Based in New Haven, CT, DSL.net, Inc. is a high-speed data communications and Internet access provider that uses digital subscriber line technology to provide high-speed Internet access solutions to small- and medium-sized businesses. DSL.net is establishing services in second and third tier cities throughout the United States. As of December 22, 1999, DSL.net had provided service or had installed equipment in over 100 cities. For more information on DSL.net visit www.dsl.net.

FORWARD LOOKING STATEMENTS

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These statements are subject to a variety of risks and uncertainties, many of which are beyond DSL.net's control, which could cause actual results to differ materially from those contemplated in these forward-looking statements. In particular, the risks and uncertainties include those described under "Risk Factors" in DSL.net's October 6, 1999 IPO Prospectus, which include, among other things, (i) DSL.net's extremely limited operating history, which makes it difficult to evaluate its business and prospects; (ii) the difficulty of predicting the new and rapidly evolving high-speed data communications industry; (iii) DSL.net's history of, and expectation of additional, losses and negative operating cash flow and need to obtain significant additional funds on acceptable terms; (iv) DSL.net's unproven business model, which may not be successful; (v) DSL.net's ability to negotiate, enter into and renew interconnection and collocation agreements with traditional local telephone companies; (vi) the intense competition in the high-speed data communications industry, which may negatively affect the number of DSL.net's customers and the pricing of its services; (vii) regulatory, legislative, and judicial developments, which could adversely affect the way DSL.net operates its business; and (viii) DSL.net's ability to recruit and retain qualified personnel and to manage the growth of its operations. Existing and prospective investors are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof. DSL.net undertakes no obligation to update or revise the information contained in this press release, whether as a result of new information, future events or circumstances or otherwise.

DSL.net's authority to provide regulated services is held by its subsidiary companies