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 |
|---|---|---|---|
| afribaba.com | #1,610 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| nustargame.com | #1,623 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| mileroticos.com | #1,653 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| #176 (Tranco) |
| Find emails |
| 5 | nist.gov | #231 (Tranco) | Find emails |
| twkan.com | #1,667 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| betking.com | #1,677 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| indown.io | #1,684 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 6 more | Find emails |
| turbo.az | #1,699 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| kumanga.com | #1,705 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| triunfobet.com | #1,717 | Cloudflare, Cloudflare edge/CDN, FingerprintJS + 9 more | Find emails |
| koselarab.com | #1,720 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| mobcup.fm | #1,760 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| onlar.az | #1,775 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| pewresearch.org | #1,777 | Amazon Route 53, Google Tag Manager, Let's Encrypt + 6 more | Find emails |
| porkbun.com | #1,778 | Amazon (ACM), Amazon Route 53, Bluesky + 19 more | Find emails |
| freecash.com | #1,781 | Cloudflare, Cloudflare Images, Cloudflare edge/CDN + 8 more | Find emails |
| sciencemag.org | #1,854 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services | Find emails |
| udemy.com | #1,863 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| thelancet.com | #1,888 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services | Find emails |
| avto.net | #1,895 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| thekamababa.com | #1,906 | Cloudflare, Cloudflare edge/CDN, Font Awesome + 5 more | Find emails |
| constantcontact.com | #1,915 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services + 1 more | Find emails |
| signal.org | #1,939 | Bluesky, Cloudflare, Cloudflare Bot Management + 4 more | Find emails |
| jamanetwork.com | #1,946 | Cloudflare Bot Management, Cloudflare edge/CDN, DigiCert + 1 more | Find emails |
| itch.io | #1,992 | Bluesky, Cloudflare, Cloudflare Bot Management + 5 more | Find emails |
| adroll.com | #2,021 | ClickTale (Contentsquare), Cloudflare, Cloudflare Bot Management + 12 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 →