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 29,664,939 websites that are Google Analytics Classic Customers. We know of 2,000,001 live websites using Google Analytics Classic and an additional 27,664,938 sites that used Google Analytics Classic historically and 1,108,989 websites in the United States.
Get a list of 29,664,939 websites using Google Analytics Classic which includes location information, hosting data, contact details, 2,000,001 currently live websites and an additional 4,115,210 domains that redirect to sites in this list. 27,664,938 sites that used this technology previously and 1,108,989 websites in the United States currently using Google Analytics Classic.