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 851,321 websites Google Publisher Tag Customers. We know of 151,897 live websites using Google Publisher Tag and an additional 699,424 sites that used Google Publisher Tag historically and 86,902 websites in the United States.
Google Publisher Tag websites that are also using other technologies.
Get a list of 851,321 websites using Google Publisher Tag which includes location information, hosting data, contact details, 151,897 currently live websites and an additional 327,545 domains that redirect to sites in this list. 699,424 sites that used this technology previouslyand 86,902 websites in the United States currently using Google Publisher Tag.
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