Adwords conversion tracking code.
https://support.google.com/adwords/answer/6095821#get_tag
Analytics and Tracking · Advertiser Tracking
Get access to data on 1,440,847 websites that are Google AdWords Conversion Customers. We know of 797,411 live websites using Google AdWords Conversion and an additional 643,436 sites that used Google AdWords Conversion historically and 395,706 websites in the United States.
Get a list of 1,440,847 websites using Google AdWords Conversion which includes location information, hosting data, contact details, 797,411 currently live websites and an additional 1,829,514 domains that redirect to sites in this list. 643,436 sites that used this technology previously and 395,706 websites in the United States currently using Google AdWords Conversion.