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 |
|---|---|---|---|
| concur.com | #43,291 | Akamai Edge DNS, Akamai mPulse, Bootstrap + 6 more | Find emails |
| elplural.com | #43,296 | Cloudflare, Let's Encrypt, reCAPTCHA v2 | Find emails |
| mycrestron.com | #43,323 | ASP.NET, DigiCert, Font Awesome + 7 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| wbcsd.org |
| #43,329 |
| Google Tag Manager, Let's Encrypt, Microsoft 365 + 4 more |
| Find emails |
| navient.com | #43,347 | Adobe Fonts (Typekit), Amazon CloudFront, Amazon Route 53 + 7 more | Find emails |
| workforce.com | #43,367 | Adobe Fonts (Typekit), Amazon Route 53, Google Analytics + 6 more | Find emails |
| eschool.edu.ps | #43,375 | Bootstrap, DigiCert, Font Awesome + 5 more | Find emails |
| xprize.org | #43,429 | Bootstrap, Cloudflare edge/CDN, Font Awesome + 5 more | Find emails |
| sesameworkshop.org | #43,456 | Amazon Route 53, Fastly, Google Tag Manager + 9 more | Find emails |
| encuentra24.com | #43,499 | AdRoll, Cloudflare, Cloudflare Web Analytics + 17 more | Find emails |
| currentaffairs.org | #43,517 | Adobe Fonts (Typekit), Cloudflare, Cloudflare Bot Management + 10 more | Find emails |
| theses.fr | #43,621 | Google Fonts, Matomo, Nuxt.js + 1 more | Find emails |
| druryhotels.com | #43,648 | ASP.NET, Bootstrap, Cloudflare + 12 more | Find emails |
| guiainfantil.com | #43,662 | Cloudflare, Cloudflare edge/CDN, Google AdSense + 4 more | Find emails |
| gizwits.com | #43,693 | Let's Encrypt, OpenResty | Find emails |
| aerospace-hardware.parts | #43,712 | reCAPTCHA v2, GoDaddy | Find emails |
| parkers.co.uk | #43,716 | Amazon (ACM), Amazon CloudFront, Google Analytics + 4 more | Find emails |
| crazy-factory.com | #43,718 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 6 more | Find emails |
| gaomon.net | #43,748 | Cloudflare edge/CDN, Let's Encrypt, Shopify + 2 more | Find emails |
| click.ru | #43,749 | Google Fonts, Let's Encrypt, Nginx + 2 more | Find emails |
| eobuwie.com.pl | #43,842 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| addsauce.com | #43,853 | Amazon Route 53, Cloudflare edge/CDN, Google Analytics + 4 more | Find emails |
| fastcloud.ge | #43,897 | Cloudflare, Font Awesome, Google Analytics + 3 more | Find emails |
| lofty.com | #43,959 | Amazon Route 53, ChatGPT Ads Pixel, Cloudflare Bot Management + 7 more | Find emails |
| hostifi.net | #43,970 | Beehiiv, Cloudflare, Cloudflare edge/CDN + 11 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 →