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 876,386 websites that are Google Publisher Tag Customers. We know of 141,841 live websites using Google Publisher Tag and an additional 734,545 sites that used Google Publisher Tag historically and 75,623 websites in the United States.
Google Publisher Tag websites that are also using other technologies.
Get a list of 876,386 websites using Google Publisher Tag which includes location information, hosting data, contact details, 141,841 currently live websites and an additional 335,942 domains that redirect to sites in this list. 734,545 sites that used this technology previouslyand 75,623 websites in the United States currently using Google Publisher Tag.
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