Fully asynchronous version of the AdSense ad code.
https://support.google.com/adsense/answer/3221666?hl=en
Advertising
Get access to data on 6,043,983 websites that are Google Adsense Asynchronous Customers. We know of 2,487,571 live websites using Google Adsense Asynchronous and an additional 3,556,412 sites that used Google Adsense Asynchronous historically and 1,338,354 websites in the United States.
Get a list of 6,043,983 websites using Google Adsense Asynchronous which includes location information, hosting data, contact details, 2,487,571 currently live websites and an additional 1,018,633 domains that redirect to sites in this list. 3,556,412 sites that used this technology previously and 1,338,354 websites in the United States currently using Google Adsense Asynchronous.
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