Classic Google Analytics - sites that are using non-universal analytics code.
https://developers.google.com/analytics/devguides/collection/gajs/
Analytics and Tracking
Get access to data on 23,407,585 websites that are Google Analytics Classic Customers. We know of 5,057,169 live websites using Google Analytics Classic and an additional 18,350,416 sites that used Google Analytics Classic historically and 2,528,286 websites in the United States.
Get a list of 23,407,585 websites using Google Analytics Classic which includes location information, hosting data, contact details, 5,057,169 currently live websites and an additional 2,753,573 domains that redirect to sites in this list. 18,350,416 sites that used this technology previously and 2,528,286 websites in the United States currently using Google Analytics Classic.
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