Google's primary tag for Google Measurement/Conversion Tracking, Adwords and DoubleClick.
https://support.google.com/adwords/answer/7548399
Analytics and Tracking
Get access to data on 43,113,481 websites that are Global Site Tag Customers. We know of 24,416,910 live websites using Global Site Tag and an additional 18,696,571 sites that used Global Site Tag historically and 3,189,928 websites in the United States.
Get a list of 43,113,481 websites using Global Site Tag which includes location information, hosting data, contact details, 24,416,910 currently live websites and an additional 4,649,745 domains that redirect to sites in this list. 18,696,571 sites that used this technology previously and 3,189,928 websites in the United States currently using Global Site Tag.
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