Valerent Joins UltraDNS Partner Program

Valerent To Offer UltraDNS' Industry Leading Managed DNS Service to Customer Base

SAN MATEO, Calif., July 8, 2003 -- UltraDNS™ Corporation, the world's leading Managed DNS Service Provider, today announced a partnership with Valerent, Inc. a wholly owned subsidiary of I-Sector Corporation (NASDAQ: ISEC). Through the partnership, Valerent will offer its customers UltraDNS' industry leading Managed DNS Service™.

"We view the UltraDNS Managed DNS Service offering as a 100 percent fail-safe solution for our outsourced Internet Infrastructure Services, ensuring a consistently richer client experience," said Frank Cano, president and CEO, Valerent. "Our clients have come to expect the quality of this type of application and we are excited to be working with UltraDNS."

UltraDNS' Managed DNS Service guarantees mission-critical, 100 percent directory services reliability and high performance - supporting millions of users managing billions of records.

"Valerent delivers IT solutions that bring high value to its customers," said Ben Petro, president and CEO, UltraDNS. "UltraDNS allows Valerent to strengthen its product offering by utilizing the world's most robust, outsourced DNS solution. We look forward to a very successful partnership."

About Valerent and I-Sector
Valerent™, Inc., a wholly owned subsidiary of I-Sector Corporation and headquartered in Houston, Texas, delivers solutions that both lower client's expenses and increase the quality of their technology experience. Additional information about Valerent is available on the Internet at www.valerent.com. Valerent is a wholly owned subsidiary of I-Sector Corporation (NASDAQ: ISEC) a company that develops, owns and operates emerging growth technology companies. Information about I-Sector Corporation, headquartered in Houston, Texas is available on the Internet at www.i-sector.com

About UltraDNS
Based in San Mateo, Calif., UltraDNS Corporation is the world's leading Managed DNS Service Provider with over five million domains currently under management, delivering solutions that enhance the reliability and performance of the world's largest directories and the mission-critical applications that access them. UltraDNS offers highly scalable solutions - both as a managed services provider and as a developer of custom infrastructure solutions - built on its unique Directory Services Platform and proprietary, patented technologies. The company operates its own global, fail-safe server network, which supports the UltraDNS Managed DNS Service, the industry's first 100 percent reliable Domain Name System (DNS) name/IP address resolution service, backed by a full service level (SLA) guarantee. UltraDNS infrastructure services, such as Managed DNS, address the growing need for quick, reliable response to directory queries in today's converging Internet/telecom environment. By connecting a user's information request to the proper directory and assuring a quick, accurate response, UltraDNS plays a key enabling role in delivering content, information and data to users when, where and on whatever device they choose. The company was founded in 1999 and is funded by Reuters Group PLC, Vantage Point Venture Partners and New Enterprise Associates. Customers include Oracle, MSN Hotmail, Forbes.com, Handspring and Petco. For more information visit www.neustarultraservices.biz.

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