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 |
|---|---|---|---|
| haisoft.net | #6,695 | Bootstrap, Font Awesome, Let's Encrypt + 5 more | Find emails |
| vodafone.pt | #6,710 | Citrix NetScaler, DigiCert, Imperva + 3 more | Find emails |
| alison.com | #6,724 | Cloudflare, Cloudflare Bot Management, Cloudflare Web Analytics + 18 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| scotsman.com |
| #6,750 |
| Cloudflare Bot Management, Cloudflare edge/CDN, Google Cloud DNS + 5 more |
| Find emails |
| travian.com | #6,753 | Amazon Route 53, Google Tag Manager, Let's Encrypt + 2 more | Find emails |
| arena.ai | #6,769 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 8 more | Find emails |
| nykaa.com | #6,775 | Adobe Analytics, Adobe Audience Manager, Adobe Experience Cloud (Launch) + 14 more | Find emails |
| dm.de | #6,777 | Let's Encrypt, reCAPTCHA Enterprise | Find emails |
| ajax.systems | #6,779 | Amazon (ACM), Amazon CloudFront, Cloudflare + 6 more | Find emails |
| myoffice.ru | #6,804 | Cloudflare, Fancybox, Google Fonts + 4 more | Find emails |
| playmogo.com | #6,983 | Bootstrap, Cloudflare, Crisp + 6 more | Find emails |
| poringa.net | #7,007 | Amazon (ACM), Cloudflare, Google Analytics + 6 more | Find emails |
| thairath.co.th | #7,027 | Amazon CloudFront, Amazon Route 53, DigiCert + 13 more | Find emails |
| askfilo.com | #7,063 | Amazon (ACM), Amazon CloudFront, AppsFlyer + 4 more | Find emails |
| control4.com | #7,102 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 7 more | Find emails |
| unstoppabledomains.com | #7,134 | Fastly, Google Cloud DNS, Let's Encrypt + 4 more | Find emails |
| bartleby.com | #7,144 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 6 more | Find emails |
| tube8.com | #7,171 | Amazon Route 53, DigiCert, Google Analytics + 3 more | Find emails |
| zerogpt.com | #7,189 | Google Ads Conversion, Google Analytics, Google Publisher Tag + 6 more | Find emails |
| mudah.my | #7,303 | Cloudflare, Cloudflare edge/CDN, DebugBear + 11 more | Find emails |
| eldebate.com | #7,331 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 4 more | Find emails |
| rule34.us | #7,403 | Google Analytics, Google Tag Manager, Let's Encrypt + 3 more | Find emails |
| alodokter.com | #7,451 | Akamai Edge DNS, AppsFlyer, Criteo + 9 more | Find emails |
| leadsquared.com | #7,496 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 6 more | Find emails |
| slobodnadalmacija.hr | #7,516 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 13 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 →