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 1,071,709 websites that are Google Analytics with Ad Tracking Customers. We know of 36,119 live websites using Google Analytics with Ad Tracking and an additional 1,035,590 sites that used Google Analytics with Ad Tracking historically and 16,836 websites in the United States.
Google Analytics with Ad Tracking websites that are also using other technologies.
Get a list of 1,071,709 websites using Google Analytics with Ad Tracking which includes location information, hosting data, contact details, 36,119 currently live websites and an additional 86,664 domains that redirect to sites in this list. 1,035,590 sites that used this technology previouslyand 16,836 websites in the United States currently using Google Analytics with Ad Tracking.
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