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 |
|---|---|---|---|
| skokka.com.pe | #10,127 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| cdnfonts.com | #10,145 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| can.az | #10,154 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| #176 (Tranco) |
| Find emails |
| 5 | nist.gov | #231 (Tranco) | Find emails |
| jedolo.com | #10,159 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| biletinial.com | #10,164 | Azure API Management, Citrix NetScaler, Google Fonts + 4 more | Find emails |
| qustodio.com | #10,167 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 17 more | Find emails |
| thlotto.com | #10,202 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| otter.ai | #10,244 | AWS Lambda, Amazon (ACM), Amazon Route 53 + 16 more | Find emails |
| hgupexam2025.com | #10,255 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| gece.az | #10,272 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| nexus.vin | #10,279 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| futurelearn.com | #10,293 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| stake.ac | #10,297 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| rokomari.com | #10,298 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| hepsiemlak.com | #10,329 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| reviews.io | #10,356 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 8 more | Find emails |
| wizards.com | #10,357 | Akamai Edge DNS, Cloudflare Bot Management, Cloudflare edge/CDN + 8 more | Find emails |
| masterclass.com | #10,359 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| betfair.com | #10,362 | Cloudflare, Cloudflare Bot Management, Cloudflare Web Analytics + 2 more | Find emails |
| lolipop.jp | #10,399 | Feedburner, Google Fonts, Google Tag Manager + 8 more | Find emails |
| btvnovinite.bg | #10,412 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| clickcease.com | #10,423 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 24 more | Find emails |
| lek-manga.net | #10,453 | Bootstrap, Cloudflare, Cloudflare Bot Management + 12 more | Find emails |
| american.edu | #10,459 | Cloudflare Bot Management, Cloudflare edge/CDN, Microsoft 365 | Find emails |
| suse.com | #10,463 | Amazon CloudFront, Amazon Route 53, AppNexus + 24 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 →