Anti-bot CAPTCHA widget from Google.
https://www.google.com/recaptcha/intro/index.html
Widgets · CAPTCHA
Get access to data on 32,943,980 websites that are reCAPTCHA Customers. We know of 15,750,820 live websites using reCAPTCHA and an additional 17,193,160 sites that used reCAPTCHA historically and 2,359,719 websites in the United States.
reCAPTCHA websites that are also using other technologies.
Get a list of 32,943,980 websites using reCAPTCHA which includes location information, hosting data, contact details, 15,750,820 currently live websites and an additional 3,208,486 domains that redirect to sites in this list. 17,193,160 sites that used this technology previously and 2,359,719 websites in the United States currently using reCAPTCHA.
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