v2 of the Google reCAPTCHA system.
https://developers.google.com/recaptcha/docs/display
Widgets
Get access to data on 7,811,017 websites reCAPTCHA v2 Customers. We know of 2,944,520 live websites using reCAPTCHA v2 and an additional 4,866,497 sites that used reCAPTCHA v2 historically and 1,363,552 websites in the United States.
Get a list of 7,811,017 websites using reCAPTCHA v2 which includes location information, hosting data, contact details, 2,944,520 currently live websites and an additional 3,105,443 domains that redirect to sites in this list. 4,866,497 sites that used this technology previouslyand 1,363,552 websites in the United States currently using reCAPTCHA v2.
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