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 |
|---|---|---|---|
| cursor.com | #4,295 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 7 more | Find emails |
| producthunt.com | #4,319 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| steamhistory.net | #4,429 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| #176 (Tranco) |
| Find emails |
| 5 | nist.gov | #231 (Tranco) | Find emails |
| leetcode.com | #4,462 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| rome2rio.com | #4,477 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| homestead.com | #4,499 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| i-fourc.com | #4,539 | Cloudflare edge/CDN, Google Tag Manager, Google Trust Services + 3 more | Find emails |
| lovable.app | #4,554 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| 17track.net | #4,560 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Analytics + 2 more | Find emails |
| npmjs.org | #4,566 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| turnitin.com | #4,577 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 11 more | Find emails |
| theiconic.com.au | #4,607 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| vivo.com.br | #4,618 | Cloudflare Bot Management, Cloudflare edge/CDN | Find emails |
| reclameaqui.com.br | #4,620 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| comix.to | #4,622 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| drpc.org | #4,661 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 9 more | Find emails |
| value-domain.com | #4,673 | Bootstrap, Chart.js, Cloudflare + 20 more | Find emails |
| onamae.com | #4,692 | Cloudflare Bot Management, Cloudflare edge/CDN | Find emails |
| bongacams.com | #4,736 | Cloudflare Bot Management, Cloudflare edge/CDN | Find emails |
| etherscan.io | #4,740 | ASP.NET, Bootstrap, Cloudflare + 16 more | Find emails |
| washingtontimes.com | #4,751 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| lufthansa.com | #4,754 | Cloudflare Bot Management, Cloudflare edge/CDN, Sectigo | Find emails |
| ucsc.edu | #4,764 | Cloudflare Bot Management, Cloudflare edge/CDN, Let's Encrypt | Find emails |
| vps-vids.com | #4,793 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| telegraaf.nl | #4,807 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 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 →