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 |
|---|---|---|---|
| wealthsimple.com | #14,596 | Amazon CloudFront, Amazon Route 53, Amazon S3 + 6 more | Find emails |
| amctheatres.com | #14,607 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services | Find emails |
| tribuna.com | #14,649 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| #176 (Tranco) |
| Find emails |
| 5 | nist.gov | #231 (Tranco) | Find emails |
| opensubtitles.com | #14,660 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| hostgator.in | #14,668 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| chordify.net | #14,671 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| toomics.com | #14,696 | Amazon Route 53, Bootstrap, Cloudflare Bot Management + 12 more | Find emails |
| psnprofiles.com | #14,697 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| icao.int | #14,701 | Azure DNS, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| uta-net.com | #14,749 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| pccomponentes.com | #14,776 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| cbn.com | #14,804 | Adobe Fonts (Typekit), Akamai Edge DNS, Akamai edge/CDN + 10 more | Find emails |
| advfn.com | #14,865 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| ascopubs.org | #14,882 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| guess.eu | #14,945 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| sitehost.co.nz | #14,948 | Google Tag Manager, Let's Encrypt, Nginx + 3 more | Find emails |
| solo.to | #14,949 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| clockify.me | #14,952 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 8 more | Find emails |
| rover.com | #14,953 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| indiankanoon.org | #14,965 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| m-w.com | #14,972 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| visual.ly | #15,025 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| artic.edu | #15,028 | Cloudflare Bot Management, Cloudflare edge/CDN, Let's Encrypt | Find emails |
| jobsdb.com | #15,034 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| adr.org | #15,047 | Google Tag Manager, Let's Encrypt, Osano + 1 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 →