Google Analytics collects the information it normally does, as well as the DoubleClick cookie when that cookie is present in relation to display advertising tracking.
https://support.google.com/analytics/answer/2444872
Analytics and Tracking · Advertiser Tracking
Get access to data on 1,119,778 websites Google Analytics with Ad Tracking Customers. We know of 66,296 live websites using Google Analytics with Ad Tracking and an additional 1,053,482 sites that used Google Analytics with Ad Tracking historically and 30,578 websites in the United States.
Google Analytics with Ad Tracking websites that are also using other technologies.
Get a list of 1,119,778 websites using Google Analytics with Ad Tracking which includes location information, hosting data, contact details, 66,296 currently live websites and an additional 121,949 domains that redirect to sites in this list. 1,053,482 sites that used this technology previouslyand 30,578 websites in the United States currently using Google Analytics with Ad Tracking.
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