Can the presence of a Cloudflare CAPTCHA page mean a website is using Cloudflare?

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Grade: Education Subject: Support
Can the presence of a Cloudflare CAPTCHA page mean a website is using Cloudflare?
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Yes, encountering a Cloudflare CAPTCHA page (e.g., 'Checking your browser before accessing...') is a definitive sign that the website is using Cloudflare's security features, such as their DDoS protection or bot mitigation services.