Undertone Networks was founded in 2002 and is part of interactive marketing and media services firm Intercept Interactive. Its offices are in Chicago, Detroit, Los Angeles, New York, and San Francisco. Undertone Networks provides interactive advertising services including creation and placement of pop-ups, pop-unders, banner ads, video, and rich media marketing messages through its online network of sites that includes ABCNews.com, A&E, and CareerBuilder. Undertone Networks reaches millions of unique users each month on behalf of advertisers that have included American Express, Netflix, and Monster.