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 875,532 websites that are Google Publisher Tag Customers. We know of 135,549 live websites using Google Publisher Tag and an additional 739,983 sites that used Google Publisher Tag historically and 72,324 websites in the United States.
Google Publisher Tag websites that are also using other technologies.
Get a list of 875,532 websites using Google Publisher Tag which includes location information, hosting data, contact details, 135,549 currently live websites and an additional 339,451 domains that redirect to sites in this list. 739,983 sites that used this technology previouslyand 72,324 websites in the United States currently using Google Publisher Tag.
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