Fully asynchronous version of the AdSense ad code.
https://support.google.com/adsense/answer/3221666?hl=en
Advertising
Get access to data on 6,146,786 websites that are Google Adsense Asynchronous Customers. We know of 2,009,183 live websites using Google Adsense Asynchronous and an additional 4,137,603 sites that used Google Adsense Asynchronous historically and 1,007,707 websites in the United States.
Get a list of 6,146,786 websites using Google Adsense Asynchronous which includes location information, hosting data, contact details, 2,009,183 currently live websites and an additional 848,173 domains that redirect to sites in this list. 4,137,603 sites that used this technology previouslyand 1,007,707 websites in the United States currently using Google Adsense Asynchronous.
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