Reston, Va. - Platform-A, the online ad unit of AOL (NYSE: TWX) formed last fall through the combination of acquired firms such as Advertising.com, Quigo and Tacoda, ranked as the No. 1 ad network in March, according to a new report from market research firm comScore.

The company's network served ads to 170 million U.S. Internet users during the month, representing 91% of the total U.S. online population.

Yahoo (NASD: YHOO) Network ranked second with a reach of 160 million, followed by Google (NASD: GOOG) Ad Network (152 million) and Specific Media (140 million).

"Ad networks have become integral components to the online advertising industry over the past several years by helping aggregate audiences for the purposes of delivering impressions to a broad array of Internet users," said Jeff Hackett, a vice president at comScore.

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