CAPTCHA & Bot Protection
56,649 of the 965,200 top sites in our Tranco top-1M census run reCAPTCHA (5.9%). Google's CAPTCHA/bot-scoring widget, the most widely deployed CAPTCHA by far. Detection is homepage-level HTML/header fingerprinting, so a site can run reCAPTCHA on other pages without it showing here.
Other captcha & bot protection
| # | Domain | Global traffic rank | Contacts |
|---|---|---|---|
| 1 | one.one | #160 (Tranco) | Find emails |
| 2 | pki.goog | #218 (Tranco) | Find emails |
| 3 | t-online.de | #220 (Tranco) | Find emails |
| 4 | dnsmadeeasy.com |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| zip.co | #17,921 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 5 more | Find emails |
| rhombussystems.com | #17,935 | Amazon CloudFront, Amazon Route 53, DigiCert + 6 more | Find emails |
| ielts.org | #17,971 | CSC (Digital Brand Services), Cloudflare Bot Management, Cloudflare edge/CDN + 4 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| worten.pt | #18,053 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 2 more | Find emails |
| 74.ru | #18,055 | DDoS-Guard, Let's Encrypt | Find emails |
| intesasanpaolo.com | #18,057 | Tealium, Adobe Experience Manager | Find emails |
| eurobet.it | #18,147 | Adobe Experience Cloud (Launch), AppsFlyer, Cloudflare Bot Management + 8 more | Find emails |
| raygun.io | #18,151 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 6 more | Find emails |
| adpone.com | #18,166 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 10 more | Find emails |
| jazztel.es | #18,232 | Envoy, Google Fonts, Google Tag Manager + 7 more | Find emails |
| subsplash.com | #18,233 | Amazon Route 53, Cloudflare edge/CDN, Google Fonts + 6 more | Find emails |
| junaidjamshed.com | #18,251 | Cloudflare edge/CDN, Google Tag Manager, Let's Encrypt + 5 more | Find emails |
| eurostar.com | #18,328 | Amazon Route 53, Fastly, Let's Encrypt + 6 more | Find emails |
| merchantos.com | #18,354 | Bootstrap, Cloudflare, Cloudflare Bot Management + 13 more | Find emails |
| spacenews.com | #18,383 | Google Analytics, Google Tag Manager, Google Trust Services + 7 more | Find emails |
| actalis.it | #18,508 | Font Awesome, Google Tag Manager, Nginx + 3 more | Find emails |
| easyliveauction.com | #18,519 | Algolia, Cloudflare, Cloudflare edge/CDN + 6 more | Find emails |
| diesiedleronline.de | #18,539 | Amazon Route 53, Cloudflare edge/CDN, Google Analytics + 3 more | Find emails |
| electrodepot.fr | #18,553 | Amazon CloudFront, Google Fonts, Magento + 1 more | Find emails |
| bablosoft.com | #18,588 | Bootstrap, Cloudflare, Font Awesome + 7 more | Find emails |
| 1clickvpn.net | #18,616 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 7 more | Find emails |
| gtt.net | #18,637 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 6 more | Find emails |
| sophi.io | #18,657 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 9 more | Find emails |
| military.eu | #18,659 | Adobe Analytics, Adobe Audience Manager, Adobe Experience Cloud (Launch) + 16 more | Find emails |
| slu.edu | #18,680 | Adobe Fonts (Typekit), Cloudflare, Font Awesome + 3 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 965,200-domain Tranco top-1M census (run top1m-2026-08-20-full), snapshot August 21, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →