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 1,187,398 websites that are Google Analytics with Ad Tracking Customers. We know of 117,765 live websites using Google Analytics with Ad Tracking and an additional 1,069,633 sites that used Google Analytics with Ad Tracking historically and 61,407 websites in the United States.
Google Analytics with Ad Tracking websites that are also using other technologies.
Get a list of 1,187,398 websites using Google Analytics with Ad Tracking which includes location information, hosting data, contact details, 117,765 currently live websites and an additional 217,313 domains that redirect to sites in this list. 1,069,633 sites that used this technology previously and 61,407 websites in the United States currently using Google Analytics with Ad Tracking.
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