CAPTCHA & Bot Protection
49,994 of the 1,000,000 top sites in our Tranco top-1M census run Cloudflare Turnstile (5%). Cloudflare's non-interactive CAPTCHA replacement, bundled free with its CDN/WAF. Detection is homepage-level HTML/header fingerprinting, so a site can run Cloudflare Turnstile on other pages without it showing here.
Other captcha & bot protection
| # | Domain | Global traffic rank | Contacts |
|---|---|---|---|
| 1 | x.com | #54 (Tranco) | Find emails |
| 2 | discord.com | #163 (Tranco) | Find emails |
| 3 | flickr.com | #172 (Tranco) | Find emails |
| 4 | soundcloud.com |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| x.com | #54 | Cloudflare Bot Management, Cloudflare edge/CDN, Envoy + 13 more | Find emails |
| discord.com | #163 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 6 more | Find emails |
| flickr.com | #172 | Adobe Fonts, Adobe Fonts (Typekit), Amazon (ACM) + 35 more | Find emails |
| #176 (Tranco) |
| Find emails |
| 5 | nist.gov | #231 (Tranco) | Find emails |
| soundcloud.com | #176 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 5 more | Find emails |
| nist.gov | #231 | Cloudflare Bot Management, Cloudflare Stream, Cloudflare edge/CDN + 8 more | Find emails |
| dnsmadeeasy.com | #291 | Adobe Experience Cloud (Launch), Cloudflare Bot Management, Cloudflare edge/CDN + 11 more | Find emails |
| wiley.com | #317 | Adobe Experience Cloud (Launch), Cloudflare edge/CDN, Fastly + 4 more | Find emails |
| launchdarkly.com | #320 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 7 more | Find emails |
| amplitude.com | #323 | Amazon (ACM), Amazon Route 53, Amplitude + 11 more | Find emails |
| issuu.com | #331 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 7 more | Find emails |
| stanford.edu | #373 | ClickTale (Contentsquare), Cloudflare Bot Management, Cloudflare edge/CDN + 7 more | Find emails |
| cookiedatabase.org | #399 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| pixabay.com | #416 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| quora.com | #454 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| addtoany.com | #470 | AddToAny, Bluesky, Cloudflare + 3 more | Find emails |
| stackoverflow.com | #502 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| markmonitor.com | #518 | Cloudflare Bot Management, Cloudflare edge/CDN, DigiCert + 1 more | Find emails |
| fandom.com | #524 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| tandfonline.com | #546 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| cookielaw.org | #590 | Adobe Experience Cloud (Launch), Cloudflare, Cloudflare Bot Management + 6 more | Find emails |
| loc.gov | #602 | AWS WAF, Adobe Experience Cloud (Launch), Amazon CloudFront + 8 more | Find emails |
| britannica.com | #604 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| onetrust.com | #610 | 6sense, Adobe Audience Manager, Adobe Experience Cloud (Launch) + 22 more | Find emails |
| merriam-webster.com | #617 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| techcrunch.com | #635 | Bluesky, Cloudflare, Google Tag Manager + 7 more | Find emails |
Showing the first 10,000matches — add a filter to narrow.
From the Crawlora Website Tech Stack Dataset, a homepage-level fingerprint of a 1,000,000-domain Tranco top-1M census (run top1m-2026-08-24-full), snapshot August 24, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →