Anti-bot CAPTCHA widget from Google.
https://www.google.com/recaptcha/intro/index.html
Widgets · CAPTCHA
Get access to data on 30,664,530 websites that are reCAPTCHA Customers. We know of 15,762,967 live websites using reCAPTCHA and an additional 14,901,563 sites that used reCAPTCHA historically and 2,425,369 websites in the United States.
reCAPTCHA websites that are also using other technologies.
Get a list of 30,664,530 websites using reCAPTCHA which includes location information, hosting data, contact details, 15,762,967 currently live websites and an additional 3,012,169 domains that redirect to sites in this list. 14,901,563 sites that used this technology previously and 2,425,369 websites in the United States currently using reCAPTCHA.
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