Adwords conversion tracking code.
https://support.google.com/adwords/answer/6095821#get_tag
Analytics and Tracking · Advertiser Tracking · Conversion Tracking
Get access to data on 4,093,284 websites that are Google AdWords Conversion Customers. We know of 2,295,619 live websites using Google AdWords Conversion and an additional 1,797,665 sites that used Google AdWords Conversion historically and 1,008,094 websites in the United States.
Google AdWords Conversion websites that are also using other technologies.
Get a list of 4,093,284 websites using Google AdWords Conversion which includes location information, hosting data, contact details, 2,295,619 currently live websites and an additional 4,584,113 domains that redirect to sites in this list. 1,797,665 sites that used this technology previously and 1,008,094 websites in the United States currently using Google AdWords Conversion.