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 |
|---|---|---|---|
| ny.gov | #2,459 | Cloudflare Bot Management, Cloudflare edge/CDN, Microsoft 365 | Find emails |
| wikia.com | #2,480 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| doordash.com | #2,488 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services | Find emails |
| #176 (Tranco) |
| Find emails |
| 5 | nist.gov | #231 (Tranco) | Find emails |
| coinbase.com |
| #2,508 |
| Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more |
| Find emails |
| register.com | #2,514 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| entrust.net | #2,550 | Akamai Edge DNS, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| lastpass.com | #2,563 | Akamai Edge DNS, Azure API Management, Cloudflare Bot Management + 8 more | Find emails |
| indiegogo.com | #2,576 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| cutt.ly | #2,617 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 6 more | Find emails |
| gamespot.com | #2,628 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Cloud DNS + 2 more | Find emails |
| surfshark.com | #2,638 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 11 more | Find emails |
| bizjournals.com | #2,650 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| coe.int | #2,653 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services | Find emails |
| nordvpn.com | #2,670 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| tenable.com | #2,676 | Amplitude, Cloudflare Bot Management, Cloudflare edge/CDN + 5 more | Find emails |
| cell.com | #2,711 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services + 1 more | Find emails |
| cookieyes.com | #2,797 | Ahrefs Analytics, Amazon S3, Bootstrap + 17 more | Find emails |
| rumble.com | #2,800 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| coingecko.com | #2,808 | Blockthrough, Cloudflare, Cloudflare edge/CDN + 9 more | Find emails |
| pypi.org | #2,817 | Amazon Route 53, Amazon S3, Atlassian Statuspage + 10 more | Find emails |
| zalo.me | #2,857 | DigiCert, Font Awesome, Google Analytics + 8 more | Find emails |
| moz.com | #2,868 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 5 more | Find emails |
| quillbot.com | #2,910 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| iea.org | #2,924 | Azure DNS, Cloudflare edge/CDN, Google Tag Manager + 4 more | Find emails |
| pastebin.com | #2,926 | Bootstrap, Cloudflare, Cloudflare Bot Management + 8 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 →