Google Publisher Tag (GPT) is an ad tagging format that provides benefits and improvements over the DART tag.
https://support.google.com/dfp_premium/bin/answer.py?hl=en&answer=181073&topic=28788&ctx=topic
Advertising
Get access to data on 869,452 websites that are Google Publisher Tag Customers. We know of 143,192 live websites using Google Publisher Tag and an additional 726,260 sites that used Google Publisher Tag historically and 76,198 websites in the United States.
Google Publisher Tag websites that are also using other technologies.
Get a list of 869,452 websites using Google Publisher Tag which includes location information, hosting data, contact details, 143,192 currently live websites and an additional 338,552 domains that redirect to sites in this list. 726,260 sites that used this technology previouslyand 76,198 websites in the United States currently using Google Publisher Tag.
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