QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 21.1

SUBSIDIARIES CONTROLLED BY REGISTRANT
As of December 31, 2010

ValueClick, Inc. Subsidiary Listing

Company	Percentage Ownership
Commission Junction, Inc. (Delaware)		100%
Mediaplex, Inc. (Delaware)		100%
ValueClick Brands, Inc. (California)		100%
ValueClick Canada, Inc. (Canada)		100%
ValueClick AB (Sweden)		100%
Pricerunner Sweden AB (Sweden)		100%
ValueClick Europe Limited (United Kingdom)		100%
ValueClick SARL (France)		100%
ValueClick Deutschland GmbH (Germany)		100%
ValueClick International Ltd. (Ireland)		100%
ValueClick Brands Computer Technology Co. Ltd. (China)		100%

QuickLinks

EXHIBIT 21.1

SUBSIDIARIES CONTROLLED BY REGISTRANT As of December 31, 2010