DICTIONARY.COM GOES BACK TO SCHOOL WITH ULTRADNS TO ENHANCE PERFORMANCE AND SECURITY

DNS Market Leader Prepares Educational Website for School Year Traffic Surge

BRISBANE, Calif., September 28, 2005 -- UltraDNS™ Corporation, the world's leading provider of Managed DNS services, today announced that Dictionary.com, a leading provider of reference products and services on the Internet, has selected UltraDNS to improve online performance and network reliability. The UltraDNS infrastructure provides Dictionary.com with massive scale and efficient management of the millions of online visitors who utilize its services during the start of a new school year. Dictionary.com, Thesaurus.com, and Reference.com are owned and operated by the Lexico Publishing Group. All of Lexico's web properties are deployed on the UltraDNS global network distributed across four continents.

"We have fortified our high-traffic web properties for future growth, due in part to the significant increased traffic that Dictionary.com, Thesaurus.com and Reference.com receive at the beginning of the school year when students around the world need assistance," said Brian Kariger, Lexico's CEO. "We chose UltraDNS because they are the proven leader in providing customized outsourced DNS solutions that deliver the highest degree of reliability and security. As we continue to grow internationally, UltraDNS will ensure that our millions of global users always have fast and reliable access to our sites."

The UltraDNS global network and directory services platform provides the critical infrastructure that Dictionary.com requires to achieve the highest levels of network performance and reliability. Through proprietary advanced routing technologies in the UltraDNS global network, Dictionary.com's clients' requests are directed to the geographically closest server in the network, enabling the fastest and most reliable response times.

"The Internet has become an irreplaceable educational resource to students around the world," said Ben Petro, president and CEO, UltraDNS. "UltraDNS is committed to ensuring that the global DNS infrastructure for leading knowledge sources such as Dictionary.com scales to meet this growing demand."

About Lexico Publishing Group
Founded in 1995, Lexico Publishing Group, LLC is a leading provider of online reference services, including Dictionary.com, called "the best general English-language dictionary online" by Web Guide magazine; the dictionary.com Word of the Day Mailing List, a daily e-mail vocabulary lesson; Thesaurus.com, the award-winning online version of Roget's Thesaurus of English Words and Phrases; Reference.com, a general reference guide and almanac; and CleverKeys, free software that gives instant access to definitions and synonyms from Windows and Macintosh programs. Dictionary.com, Thesaurus.com and Reference.com combined to serve more than 17 million unique visitors in April 2005. The Word of the Day Mailing List has more than 845,000 subscribers.

About UltraDNS
UltraDNS Corporation is the world's leading Managed DNS Service Provider, delivering superior security, reliability and performance to organizations that rely on DNS for their critical business processes, applications and services. With the growth in e-commerce and the emergence of advanced DNS-based communication and supply chain management services, organizations can no longer rely on traditional approaches to DNS. On October 20th, 2005 UltraDNS launched the DNS Shield™ in partnership with major Internet Service Providers (ISPs) including AOL, Earthlink, Time Warner and Yahoo to provide the highest level of reliability and security to over 100 million Internet users.

UltraDNS provides a range of global and local DNS solutions - both managed services and custom infrastructure - built on its unique Directory Services Platform and proprietary, patented technologies. Through its thousands of enterprise, service provider and TLD infrastructure customers, UltraDNS powers the resolution of over 15 million domains around the globe. UltraDNS has offices in California, Virginia, Arizona, Chicago and the UK. For more information please visit www.ultradns.com.

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