DSL.net Launches Full Suite of Integrated Voice and Data Offerings in New York City Region.

Business Editors/High-Tech Writers

NEW HAVEN, Conn.--(BUSINESS WIRE)--Feb. 5, 2004

Data Services Bundled with VoIP to Include Unlimited Local,

Unlimited Regional and Unlimited Long-Distance Calling

DSL.net, Inc. (NASDAQ: DSLN), a leading nationwide provider of broadband communications services to businesses, said today that its NETgain One integrated voice and data bundled services are now available in the New York City metropolitan area.

The NETgain One broadband packages are provided over business-class DSL and T-1 platforms with speeds up to 1.5 Mbps. Each offering includes unlimited local, unlimited regional and unlimited domestic long-distance calling. Multiple bundles varying by the number of phone lines and broadband speeds are available to meet the needs of a variety of business types and sizes.

"We firmly believe that our integrated voice and data service, which utilizes VoIP (voice over Internet protocol), is one of the most comprehensive and reliable VoIP offerings in the industry," said Keith Markley, president and chief operating officer of DSL.net. "Our January launch in New York City has been completed on schedule and we look forward to expanding the NETgain One service area into Northern New Jersey and Connecticut in the coming months."

In addition to New York City, NETgain One also is available in the Washington, D.C., metro region, including parts of Maryland and Virginia. NETgain One was launched in the DC area at the end of 2003.

"Combining voice and data makes our life simple with a fixed monthly charge that provides attractive cost-savings benefits," said DSL.net customer Jon Aust, president of Sterling, Va.-based Easy Pay Solutions Network, which provides automated financial services to health-care providers. "We're pleased with the high quality of our VoIP calls and we really like the savings on our phone bills."

In contrast to other best-effort VoIP services, the DSL.net voice services are provided on a facilities-based, fully controlled, QoS-enabled network. This quality-of-service approach ensures that adequate bandwidth is always available for the voice service and the voice quality is equivalent to traditional voice services. The DSL.net integrated voice and data network uses Cisco Systems' best-of-breed softswitch routers and gateways. In addition, DSL.net utilizes award-winning software applications from Broadsoft(R), Inc., for the voice features and enhanced services. NETgain One is compatible with existing phone systems and customers can keep their existing phone number.

"NETgain One is a leading edge and reliable service that delivers a high-quality voice experience in a very efficient manner over our private and secure broadband network," said Markley. "That efficiency allows us to pass on significant cost savings to our customers. We believe that DSL.net is now well-positioned in two of the biggest metropolitan markets in the country to meet the growing demand of business customers for bundled communications services."

A recently published telecommunications industry report on VoIP by Connecticut Research, Inc. (www.connecticutresearch.net) included DSL.net in a list of three companies that the research firm said were positioned for what it described as "commercially significant market opportunities" in the VoIP sector. The report is available in a read-only format in the news center and investor relation sections of the DSL.net Web site (www.dsl.net) until Friday, Feb. 6, 2004, at 12 noon Eastern time.

About DSL.net

DSL.net, Inc. is a leading nationwide provider of broadband communications services to businesses. The Company combines its own facilities, nationwide network infrastructure and Internet Service Provider (ISP) capabilities to provide high-speed Internet access, private network solutions and value-added services directly to small- and medium-sized businesses or larger enterprises looking to connect multiple locations. DSL.net product offerings include T-1 and business-class DSL services, virtual private networks (VPNs), frame relay, Web hosting, DNS management, enhanced e-mail, online data backup and recovery services, firewalls and nationwide dial-up services, as well as integrated voice and data offerings in select markets. For more information, visit www.dsl.net, e-mail [e-mail] or call 1-877-DSL-NET1 (1-877-375-6381).

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 forward-looking 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, among other things, (i) the marketplace's receptiveness to DSL.net's offering of integrated voice and data services; (ii) DSL.net's unproven business model, which may not be successful; (iii) DSL.net's ability to execute its business plan in a timely manner to generate sufficient revenue, contain certain discretionary spending or achieve certain other business plan objectives; (iv) regulatory, legislative and judicial developments, which could adversely affect the way DSL.net operates its business; (v) competition; and (vi) DSL.net's dependence on wholesale providers to provide it with local DSL and T-1 facilities in areas where it has not deployed its own equipment. 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, and disclaims any 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. For additional information regarding these and other risks faced by DSL.net, see the disclosure contained under "Risk Factors'' in DSL.net's Annual Report on Form 10-K for the year ended December 31, 2002, which has been filed with the Securities and Exchange Commission.

NETgain One bundles with unlimited local and domestic long-distance calling are not available to certain high-volume category users (e.g., telemarketing agencies). Additional service charges may apply for non-permitted usage.

DSL.net is a trademark of DSL.net, Inc. Other company names may be trademarks of their respective owners.