Challenge action against web requests that match your rule's inspection criteria.
https://docs.aws.amazon.com/waf/latest/developerguide/waf-captcha-and-challenge.html
Widgets · CAPTCHA
Get access to data on 18,631 websites that are Amazon AWS WAF Challenge Customers. We know of 6,817 live websites using Amazon AWS WAF Challenge and an additional 11,814 sites that used Amazon AWS WAF Challenge historically and 4,599 websites in the United States.
Get a list of 18,631 websites using Amazon AWS WAF Challenge which includes location information, hosting data, contact details, 6,817 currently live websites and an additional 33,514 domains that redirect to sites in this list. 11,814 sites that used this technology previouslyand 4,599 websites in the United States currently using Amazon AWS WAF Challenge.
Countries
Financial
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Region
These are sites that we think might use Amazon AWS WAF Challenge in the future because of their similarity to other sites that already do.