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 849,264 websites Google Publisher Tag Customers. We know of 177,085 live websites using Google Publisher Tag and an additional 672,179 sites that used Google Publisher Tag historically and 104,164 websites in the United States.
Google Publisher Tag websites that are also using other technologies.
Get a list of 849,264 websites using Google Publisher Tag which includes location information, hosting data, contact details, 177,085 currently live websites and an additional 364,817 domains that redirect to sites in this list. 672,179 sites that used this technology previouslyand 104,164 websites in the United States currently using Google Publisher Tag.
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