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 |
|---|---|---|---|
| lovable.dev | #4,855 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| acast.com | #4,858 | AWS Lambda, Amazon Route 53, Cloudflare edge/CDN + 11 more | Find emails |
| hindawi.com | #4,863 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| #176 (Tranco) |
| Find emails |
| 5 | nist.gov | #231 (Tranco) | Find emails |
| atera.com | #4,882 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| royalsocietypublishing.org | #4,899 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| impact.com | #4,905 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 13 more | Find emails |
| softpedia.com | #4,910 | Cloudflare Bot Management, Cloudflare edge/CDN, Sectigo | Find emails |
| smule.com | #4,923 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services | Find emails |
| midjourney.com | #4,925 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| laravel-news.com | #4,931 | Adobe Fonts (Typekit), Bunny Fonts, Cloudflare + 10 more | Find emails |
| simply.com | #4,941 | Bootstrap, Google Analytics, Google Tag Manager + 8 more | Find emails |
| rozetka.com.ua | #4,964 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| aps.org | #4,989 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| zotero.org | #5,012 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 3 more | Find emails |
| ecwid.com | #5,034 | All in One SEO, Amazon (ACM), Amazon CloudFront + 7 more | Find emails |
| teachable.com | #5,038 | AWS Lambda, Ahrefs Analytics, Cloudflare + 13 more | Find emails |
| moma.org | #5,046 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| bleepingcomputer.com | #5,087 | Bootstrap, Cloudflare, Cloudflare Bot Management + 11 more | Find emails |
| iherb.com | #5,094 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| alldatasheet.com | #5,106 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services | Find emails |
| trueconf.com | #5,107 | Google Fonts, Google Tag Manager, Microsoft Advertising (Bing UET) + 9 more | Find emails |
| dian.gov.co | #5,123 | ASP.NET, Azure Front Door, Bootstrap + 11 more | Find emails |
| suruga-ya.jp | #5,136 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services | Find emails |
| spankbang.party | #5,148 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| zyxel.com | #5,153 | Amazon CloudFront, Cloudflare Bot Management, Cloudflare edge/CDN + 13 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 →