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 |
|---|---|---|---|
| umcs.pl | #39,613 | Google Ads Conversion, Google Fonts, Google Tag Manager + 3 more | Find emails |
| roanoke.com | #39,616 | Amazon Advertising, Font Awesome, Google AdSense + 16 more | Find emails |
| castify.ai | #39,618 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 11 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| lnwshop.com |
| #39,648 |
| Google Analytics, Google Tag Manager, Google Workspace + 7 more |
| Find emails |
| shelter.org.uk | #39,658 | Amazon Route 53, Contentful, Gatsby + 5 more | Find emails |
| prodirectsport.com | #39,666 | Adobe Fonts (Typekit), Bazaarvoice, Bootstrap + 8 more | Find emails |
| adme.ru | #39,700 | Amazon Advertising, Amazon Route 53, Google Analytics + 5 more | Find emails |
| lauradate.com | #39,705 | Cloudflare, Cloudflare edge/CDN, Fingerprint Pro + 7 more | Find emails |
| learnupon.com | #39,747 | Amazon Route 53, Cloudflare edge/CDN, Google Tag Manager + 3 more | Find emails |
| getnetset.com | #39,826 | Amazon (ACM), Amazon CloudFront, Google Analytics + 5 more | Find emails |
| sefaria.org | #39,905 | Cloudflare, Cloudflare edge/CDN, Font Awesome + 17 more | Find emails |
| clevescene.com | #39,920 | Google Analytics, Google Tag Manager, Google Trust Services + 7 more | Find emails |
| applicantpro.com | #39,928 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 5 more | Find emails |
| bits.media | #39,932 | Google Analytics, Google Tag Manager, Let's Encrypt + 3 more | Find emails |
| truthdig.com | #39,938 | Adobe Fonts (Typekit), Cloudflare, Cloudflare Bot Management + 7 more | Find emails |
| muz.li | #39,948 | Google Fonts, Let's Encrypt, Nuxt.js + 2 more | Find emails |
| likeevideo.com | #39,971 | Amazon Route 53, Kong, Nginx + 1 more | Find emails |
| zombeek.cz | #39,972 | Bootstrap, Chart.js, Font Awesome + 9 more | Find emails |
| leatherman.com | #39,990 | Azure DNS, Cloudflare edge/CDN, Let's Encrypt + 5 more | Find emails |
| negate.io | #40,121 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 1 more | Find emails |
| getmetrical.com | #40,156 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 4 more | Find emails |
| dotter.me | #40,175 | Adobe Fonts (Typekit), Amazon Route 53, Cloudflare edge/CDN + 8 more | Find emails |
| tarhelypark.hu | #40,216 | Bootstrap, DigiCert, Google Fonts + 9 more | Find emails |
| levels.fyi | #40,228 | Amazon (ACM), Amazon CloudFront, Cloudflare + 4 more | Find emails |
| bluemountain.com | #40,241 | Akamai mPulse, Amazon Route 53, Constructor.io + 5 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 →