The analytics.js JavaScript snippet is a new way to measure how users interact with your website. It is similar to the previous Google tracking code, ga.js, but offers more flexibility for developers to customize their implementations.
https://developers.google.com/analytics/devguides/collection/analyticsjs/
Analytics and Tracking
Get access to data on 50,814,636 websites that are Google Universal Analytics Customers. We know of 21,707,762 live websites using Google Universal Analytics and an additional 29,106,874 sites that used Google Universal Analytics historically and 1,604,608 websites in the United States.
Google Universal Analytics websites that are also using other technologies.
Get a list of 50,814,636 websites using Google Universal Analytics which includes location information, hosting data, contact details, 21,707,762 currently live websites and an additional 3,129,726 domains that redirect to sites in this list. 29,106,874 sites that used this technology previouslyand 1,604,608 websites in the United States currently using Google Universal Analytics.
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