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 |
|---|---|---|---|
| thinkific.com | #5,658 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| yaplakal.com | #5,659 | Cloudflare, Cloudflare edge/CDN, Google Hosted Libraries + 6 more | Find emails |
| boingboing.net | #5,664 | Amazon Advertising, Blockthrough, Cloudflare + 16 more | Find emails |
| #176 (Tranco) |
| Find emails |
| 5 | nist.gov | #231 (Tranco) | Find emails |
| jooble.org | #5,681 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| tracker.gg | #5,684 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| codecanyon.net | #5,689 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| apkmirror.com | #5,694 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| geo.io | #5,724 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| dnb.com | #5,738 | Akamai Edge DNS, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| teepublic.com | #5,745 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 7 more | Find emails |
| americanbar.org | #5,746 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| bulbagarden.net | #5,753 | Bluesky, Cloudflare, Cloudflare Bot Management + 4 more | Find emails |
| neon.tech | #5,773 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 5 more | Find emails |
| raspberrypi.com | #5,797 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services | Find emails |
| liebertpub.com | #5,807 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| iaea.org | #5,831 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| getpostman.com | #5,833 | Amazon CloudFront, Amazon Route 53, Amazon S3 + 13 more | Find emails |
| takealot.com | #5,838 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN | Find emails |
| inaturalist.org | #5,869 | Bluesky, Cloudflare Bot Management, Cloudflare edge/CDN + 10 more | Find emails |
| webstaurantstore.com | #5,884 | Apple Pay, Cloudflare, Cloudflare Bot Management + 12 more | Find emails |
| informer.com | #5,894 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| medrxiv.org | #5,898 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| beacons.ai | #5,928 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| bhphotovideo.com | #5,930 | Cloudflare Bot Management, Cloudflare edge/CDN, Let's Encrypt | Find emails |
| toyokeizai.net | #5,943 | Amazon Advertising, Amazon Route 53, Cloudflare Bot Management + 10 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 →