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 |
|---|---|---|---|
| equityapartments.com | #13,611 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| autonews.com | #13,613 | Adobe Experience Cloud (Launch), Adobe Fonts (Typekit), Akamai edge/CDN + 11 more | Find emails |
| hathitrust.org | #13,670 | Cloudflare Bot Management, Cloudflare edge/CDN, Let's Encrypt | Find emails |
| #176 (Tranco) |
| Find emails |
| 5 | nist.gov | #231 (Tranco) | Find emails |
| qut.edu.au | #13,680 | Cloudflare Bot Management, Cloudflare edge/CDN, Let's Encrypt | Find emails |
| kingston.com | #13,698 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| rtx.com | #13,701 | ASP.NET, Azure API Management, Azure Front Door + 12 more | Find emails |
| az.gov | #13,725 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| ipinfodb.com | #13,735 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| openart.ai | #13,749 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 6 more | Find emails |
| igdb.com | #13,766 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| worldscientific.com | #13,768 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| gamestar.de | #13,791 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| ams.org | #13,811 | ASP.NET, Bootstrap, Cloudflare + 13 more | Find emails |
| goodsync.com | #13,821 | Google Tag Manager, Olark, Sectigo + 2 more | Find emails |
| teamspeak.com | #13,843 | Bootstrap, Cloudflare, Cloudflare Bot Management + 16 more | Find emails |
| ademe.fr | #13,872 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| gutefrage.net | #13,893 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| 6sense.com | #13,932 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| radaris.com | #13,937 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| nga.gov | #13,943 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Trust Services + 1 more | Find emails |
| devowl.io | #13,948 | Cloudflare, Cloudflare edge/CDN, ConsentMo + 5 more | Find emails |
| elsevierpure.com | #13,955 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| ibge.gov.br | #13,987 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Analytics + 5 more | Find emails |
| acpjournals.org | #14,051 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| citizen.co.za | #14,095 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 14 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 →