Fully asynchronous version of the AdSense ad code.
https://support.google.com/adsense/answer/3221666?hl=en
Advertising
Get access to data on 5,784,878 websites that are Google Adsense Asynchronous Customers. We know of 2,502,943 live websites using Google Adsense Asynchronous and an additional 3,281,935 sites that used Google Adsense Asynchronous historically and 1,376,715 websites in the United States.
Get a list of 5,784,878 websites using Google Adsense Asynchronous which includes location information, hosting data, contact details, 2,502,943 currently live websites and an additional 991,492 domains that redirect to sites in this list. 3,281,935 sites that used this technology previously and 1,376,715 websites in the United States currently using Google Adsense Asynchronous.
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