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 22,697,100 websites that are Google Analytics Classic Customers. We know of 2,599,316 live websites using Google Analytics Classic and an additional 20,097,784 sites that used Google Analytics Classic historically and 1,437,179 websites in the United States.
Get a list of 22,697,100 websites using Google Analytics Classic which includes location information, hosting data, contact details, 2,599,316 currently live websites and an additional 1,571,356 domains that redirect to sites in this list. 20,097,784 sites that used this technology previouslyand 1,437,179 websites in the United States currently using Google Analytics Classic.
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