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 |
|---|---|---|---|
| zennioptical.com | #16,652 | Akamai Bot Manager, Botify, DigiCert + 9 more | Find emails |
| lytehosting.com | #16,676 | ChatGPT Ads Pixel, Cloudflare, Font Awesome + 5 more | Find emails |
| pirelli.com | #16,681 | Amazon CloudFront, DigiCert, Google Ads Conversion + 2 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| cira.ca | #16,728 | Cloudflare edge/CDN, Google Analytics, Google Tag Manager + 4 more | Find emails |
| litespeedtech.com | #16,814 | Cloudflare, Let's Encrypt | Find emails |
| passkey.com | #16,820 | 6sense, Adobe Experience Cloud (Launch), Amazon (ACM) + 13 more | Find emails |
| cheaptickets.nl | #16,833 | Akamai Edge DNS, Cloudflare Web Analytics, DigiCert + 6 more | Find emails |
| christianbook.com | #16,841 | Akamai Edge DNS, Akamai mPulse, Attentive + 7 more | Find emails |
| psychologicalscience.org | #16,843 | Adobe Fonts (Typekit), Cloudflare, Cloudflare Web Analytics + 7 more | Find emails |
| solutionslabkit.com | #16,886 | GoDaddy Website Builder, GoDaddy | Find emails |
| deputy.com | #16,908 | Amazon Route 53, Cloudflare edge/CDN, Google Fonts + 4 more | Find emails |
| quebec.ca | #16,946 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 7 more | Find emails |
| bitsdujour.com | #16,985 | ASP.NET, Google AdSense, Google Analytics + 3 more | Find emails |
| danviet.vn | #17,010 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 6 more | Find emails |
| worldofbooks.com | #17,014 | Cloudflare edge/CDN, Google Cloud DNS, Let's Encrypt + 6 more | Find emails |
| wponetap.com | #17,040 | DigiCert, Font Awesome, Google Fonts + 6 more | Find emails |
| wwnorton.com | #17,061 | Amazon Route 53, DigiCert, Google Analytics + 5 more | Find emails |
| aena.es | #17,128 | Adobe Experience Cloud (Launch), Akamai edge/CDN, Akamai mPulse + 7 more | Find emails |
| hallmark.com | #17,130 | Adobe Experience Cloud (Launch), Cloudflare edge/CDN, Datadog + 6 more | Find emails |
| plati.market | #17,137 | Bootstrap, DDoS-Guard, Fancybox + 2 more | Find emails |
| voxexchange.io | #17,145 | Cloudflare, Google Fonts, Google Tag Manager + 3 more | Find emails |
| plus.net | #17,172 | DigiCert, Foundation, Google Tag Manager + 3 more | Find emails |
| masters.com | #17,234 | Adobe Experience Cloud (Launch), Akamai Bot Manager, Akamai Edge DNS + 4 more | Find emails |
| mezmo.com | #17,236 | Amazon Route 53, Cloudflare edge/CDN, Google Tag Manager + 3 more | Find emails |
| thenational.ae | #17,286 | Cloudflare, Let's Encrypt, Microsoft 365 + 2 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 →