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 850,129 websites that are Google Publisher Tag Customers. We know of 190,344 live websites using Google Publisher Tag and an additional 659,785 sites that used Google Publisher Tag historically and 112,746 websites in the United States.
Google Publisher Tag websites that are also using other technologies.
Get a list of 850,129 websites using Google Publisher Tag which includes location information, hosting data, contact details, 190,344 currently live websites and an additional 422,085 domains that redirect to sites in this list. 659,785 sites that used this technology previously and 112,746 websites in the United States currently using Google Publisher Tag.
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