MEDIAPLEX DESIGNATES RealMapping AS A PREFERRED VENDOR

Mediaplex Inc, a leading advertising technology company, and RealMapping, a leading company for highly accurate IP databases, announced an integration of RealMapping's worldwide IP address software with Mediaplex's pioneering MOJO (mobile Java objects) ad-serving technology. Under the terms of the contractual agreement, Mediaplex has designated RealMapping as a Preferred Vendor.

In response to the increasing demand of online advertisers for greater return on investment, the technology integration is designed to deliver higher rates of customer conversion based on the ability to automatically tailor digital advertising to specific geographic target groups in real time.

Leveraging a vast database of over four billion global IP addresses, the RealMapping Country software has the capability to determine where a visitor to a Website, or virtually any digital platform, originates. Mediaplex's proprietary MOJO platform is the only messaging technology with the ability to draw on an advertiser's up-to-the-minute business data to instantly tailor message content for an adjusted price, product or, integrated with RealMapping, geographic data. MOJO then automatically varies an advertiser's message to incorporate content relevant to country of origin.

For example, a worldwide automotive advertiser will enhance results if marketing is tailored to a particular country and, therefore, the culture of that country. Swedes might be primarily interested in safety, the Dutch in fuel economy, and the Italians in design. As a result of local legislation, there are also differences in standard equipment mandates. With the integrated technologies, the design, information, and language presented in the manufacturer's ads is automatically adjusted per the site visitor's origin.

"As with all communications, the more accurately a target group is reached and the more relevant the message presented, the greater the level of both responsiveness and customer satisfaction," said Mark van der Linden, RealMapping's Chief Commercial Officer. "RealMapping offers Mediaplex the capability to target advertisements with a higher degree of accuracy due to the fact that its MOJO technology is now able to instantly recognize the geography and, by extension, the culture, of any relevant target group."

Said Anders Torgerson, Mediaplex's vice president product management, "We are very encouraged by RealMapping's proven ability to deliver and maintain a highly superior accuracy rate in determination of country and language of site visitors. As Mediaplex expands its business globally, this level of enhancement of our geo-targeting capability becomes all the more crucial."

About Mediaplex Inc

Mediaplex Inc, www.mediaplex.com, is a leading advertising technology company. Mediaplex's proprietary MOJO (mobile Java objects) technology is the only platform that can automatically configure ad messages in response to real- time changes in an advertiser's key business variables, such as inventory levels, product pricing and customer data, then communicate the campaign results back for ongoing optimization. In addition, Mediaplex provides comprehensive online campaign services. Mediaplex clients include Motorola, eBay, macys.com, OfficeMax.com, eCOST.com, and advertising agencies such as The Interpublic Group of Companies and its subsidiaries McCannErickson /A&L and DraftWorldwide, Young & Rubicam and its subsidiary The Digital Edge, Publicis & Hal Riney, Tonic 360 and Lot21 on behalf of their clients such as Sprint PCS, Sun Microsystems, and Palm Computing. Mediaplex is headquartered in San Francisco with offices in New York, Silicon Valley and Louisville. Mediaplex can be contacted at 877-402-PLEX.

About RealMapping

RealMapping, www.realmapping.com, is a leading company for highly accurate IP targeting solutions. RealMapping maintains the world's most accurate IP database for country, language, region and target group recognition of Internet users. The accuracy of its database is over 97.5% on a country and language determination of a Website visitor.

RealMapping was founded in 1999. After spending more than a year developing the database, RealMapping released its first products in April, 2000. RealMapping is headquartered in Amsterdam (The Netherlands) with an office in London, and will soon open an office in New York. RealMapping can be contacted at +31-20-888-4530.

Contact Mediaplex Inc, Joy Fauvre, 415-808-1930, jfauvre@mediaplex.com or RealMapping, Mark van der Linden, +31-20-888-4530, vanderlinden@realmapping.com.