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 |
|---|---|---|---|
| talahost.com | #28,014 | reCAPTCHA v2 | Find emails |
| virusfree.cz | #28,024 | Google Analytics, Google Tag Manager | Find emails |
| fashionphile.com | #28,027 | Algolia, Cloudflare, Cloudflare edge/CDN + 6 more | Find emails |
| tulsaworld.com |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| #28,033 |
| Amazon Advertising, Font Awesome, Google AdSense + 15 more |
| Find emails |
| remarkable.com | #28,073 | Google Cloud DNS, Let's Encrypt, Next.js + 4 more | Find emails |
| nexters.com | #28,089 | Amazon (ACM), Amazon Route 53, Google Workspace + 2 more | Find emails |
| themewagon.com | #28,170 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 7 more | Find emails |
| emsisoft.com | #28,195 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 5 more | Find emails |
| loveandlemons.com | #28,241 | Cloudflare, Cloudflare edge/CDN, ConsentMo + 5 more | Find emails |
| lesswrong.com | #28,279 | Adobe Fonts (Typekit), Amazon Route 53, Cloudinary + 7 more | Find emails |
| nutaku.com | #28,313 | Amazon Route 53, Google Tag Manager, Let's Encrypt + 3 more | Find emails |
| eiu.edu | #28,409 | Adobe Fonts (Typekit), Font Awesome, Google Tag Manager + 2 more | Find emails |
| repsol.com | #28,425 | Adobe Experience Cloud (Launch), Amazon Route 53, DigiCert + 6 more | Find emails |
| surl.li | #28,436 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 3 more | Find emails |
| aist.go.jp | #28,450 | Amazon CloudFront, Amazon Route 53, DigiCert + 5 more | Find emails |
| nationalmssociety.org | #28,468 | Adyen, Braintree, Brightcove + 24 more | Find emails |
| framagit.org | #28,476 | Let's Encrypt, Matomo, Ruby on Rails + 1 more | Find emails |
| medianewsgroup.com | #28,509 | Adobe Fonts (Typekit), Amazon Route 53, Let's Encrypt + 5 more | Find emails |
| activeboard.com | #28,534 | Bootstrap, Nginx, Sectigo + 2 more | Find emails |
| cmake.org | #28,607 | Fancybox, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| proisp.no | #28,613 | Atlassian Statuspage, Google Fonts, OpenResty + 5 more | Find emails |
| turk.net | #28,650 | Google Fonts, Google Tag Manager, Next.js + 2 more | Find emails |
| renaissancecreation.com | #28,681 | Adobe Fonts (Typekit), Cloudflare edge/CDN, CookieYes + 9 more | Find emails |
| rdb.ru | #28,770 | DDoS-Guard, reCAPTCHA v2 | Find emails |
| 4s.io | #28,794 | Bootstrap, DigiCert, Google Analytics + 4 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 →