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 |
|---|---|---|---|
| e-flux.com | #31,158 | Cloudflare, Let's Encrypt, Mapbox + 6 more | Find emails |
| studfile.net | #31,159 | Let's Encrypt, Nginx, PHP + 1 more | Find emails |
| liqu.id | #31,170 | Bootstrap, Cloudflare, Nginx + 5 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| sugarsync.com |
| #31,190 |
| Cloudflare Bot Management, Cloudflare edge/CDN, Google Analytics + 3 more |
| Find emails |
| facs.org | #31,198 | DigiCert, Google Tag Manager, Hotjar + 3 more | Find emails |
| visitcalifornia.com | #31,239 | Amazon Route 53, Drupal, Gatsby + 5 more | Find emails |
| canadahelps.org | #31,318 | Azure DNS, Fastly, Font Awesome + 11 more | Find emails |
| last-z.com | #31,390 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 4 more | Find emails |
| lynxoft.ru | #31,534 | Let's Encrypt, Nginx, PHP + 2 more | Find emails |
| georgjensen.com | #31,540 | AOS, Adobe Fonts (Typekit), Cloudflare edge/CDN + 13 more | Find emails |
| plaud.ai | #31,541 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 5 more | Find emails |
| ecosense.io | #31,551 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 8 more | Find emails |
| maxma.com | #31,557 | Cloudflare, Google Tag Manager, Let's Encrypt + 5 more | Find emails |
| dibiz.com | #31,614 | Bootstrap, Font Awesome, Google Analytics + 10 more | Find emails |
| chairish.com | #31,656 | Adobe Fonts (Typekit), Amazon Route 53, Fastly + 8 more | Find emails |
| iqos.com | #31,659 | Akamai Bot Manager, Akamai mPulse, Amazon CloudFront + 20 more | Find emails |
| hopper.com | #31,665 | DataDome, Envoy, Google Cloud DNS + 5 more | Find emails |
| teamtreehouse.com | #31,677 | Amazon (ACM), Amazon Route 53, Bugsnag + 10 more | Find emails |
| thespec.com | #31,698 | Amazon Advertising, Amazon Route 53, Font Awesome + 9 more | Find emails |
| 7gra.us | #31,726 | Amazon Route 53, Let's Encrypt, Nginx + 2 more | Find emails |
| aacap.org | #31,741 | ASP.NET, Adobe Fonts (Typekit), Google Ads Conversion + 6 more | Find emails |
| tuko.co.ke | #31,756 | Amazon (ACM), Amazon CloudFront, Cloudflare + 3 more | Find emails |
| nmugroup.se | #31,806 | Google Analytics, Google Tag Manager, Let's Encrypt + 2 more | Find emails |
| min.io | #31,875 | Cloudflare edge/CDN, Google Analytics, Google Tag Manager + 4 more | Find emails |
| redflagdeals.com | #31,882 | Amazon Advertising, Fastly, Font Awesome + 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 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 →