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 |
|---|---|---|---|
| thueringen.de | #27,343 | Friendly Captcha, Let's Encrypt, unpkg | Find emails |
| uaudio.com | #27,348 | Amazon Route 53, Cloudflare edge/CDN, Kameleoon + 5 more | Find emails |
| archive.li | #27,352 | Let's Encrypt, Nginx, reCAPTCHA v2 | Find emails |
| 360cities.net |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| #27,398 |
| Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 9 more |
| Find emails |
| kaiostech.com | #27,405 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 10 more | Find emails |
| tureng.com | #27,427 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 5 more | Find emails |
| xcritical.com | #27,436 | Amazon (ACM), Amazon CloudFront, Cloudflare + 3 more | Find emails |
| hostdime.com | #27,439 | Google Analytics, Google Tag Manager, Let's Encrypt | Find emails |
| bytemark.co.uk | #27,534 | Bootstrap, DigiCert, Font Awesome + 9 more | Find emails |
| imprdom.com | #27,540 | GoDaddy Website Builder, GoDaddy | Find emails |
| boden.com | #27,614 | Adobe Analytics, Adobe Audience Manager, Adobe Experience Cloud (Launch) + 10 more | Find emails |
| freedownloadmanager.org | #27,651 | Amazon Route 53, Font Awesome, Google Analytics + 5 more | Find emails |
| prismray.io | #27,667 | Cloudflare, Cloudflare edge/CDN, Cookiebot + 4 more | Find emails |
| vwthemes.com | #27,672 | Cloudflare, Cloudflare edge/CDN, Font Awesome + 13 more | Find emails |
| lacrossetechnology.com | #27,755 | Adobe Fonts (Typekit), Amazon Route 53, Axios + 16 more | Find emails |
| shrinetheme.com | #27,775 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 5 more | Find emails |
| westword.com | #27,796 | Cloudflare, Let's Encrypt, Nginx + 4 more | Find emails |
| skyandtelescope.org | #27,838 | Cloudflare, Cloudflare edge/CDN, Fancybox + 15 more | Find emails |
| tapnative.com | #27,879 | AOS, AdRoll, Amazon Route 53 + 13 more | Find emails |
| ecma-international.org | #27,885 | Google Analytics, Google Fonts, Google Tag Manager + 5 more | Find emails |
| naeyc.org | #27,895 | Cloudflare, Cloudflare edge/CDN, Drupal + 11 more | Find emails |
| bsc.es | #27,966 | Drupal, Google Analytics, Google Tag Manager + 1 more | Find emails |
| core77.com | #27,971 | ASP.NET, Cloudflare, Cloudflare Web Analytics + 6 more | Find emails |
| centralnic.com | #27,981 | Cloudflare edge/CDN, CookieYes, Google Trust Services + 3 more | Find emails |
| 3dos.io | #27,997 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 9 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 →