CAPTCHA & Bot Protection
91,344 of the 1,000,000 top sites in our Tranco top-1M census run reCAPTCHA (9.1%). 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 | snapchat.com | #123 (Tranco) | Find emails |
| 2 | apache.org | #125 (Tranco) | Find emails |
| 3 | one.one | #160 (Tranco) | Find emails |
| 4 | w3.org |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| zattini.com.br | #28,182 | Amazon Route 53, Azion, Express + 9 more | Find emails |
| emsisoft.com | #28,195 | Cloudflare, Cloudflare edge/CDN, DoubleClick (Google Ads) + 6 more | Find emails |
| loveandlemons.com | #28,241 | Cloudflare, Cloudflare edge/CDN, ConsentMo + 5 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| studylib.net | #28,251 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 7 more | Find emails |
| hostlife.net | #28,265 | Apache, Bootstrap, Fancybox + 10 more | Find emails |
| lesswrong.com | #28,279 | Adobe Fonts (Typekit), Amazon Route 53, Cloudinary + 7 more | Find emails |
| riddle.com | #28,290 | CookieHub, Google Tag Manager, Nuxt.js + 7 more | Find emails |
| nutaku.com | #28,313 | Amazon Route 53, Freshchat, Google Tag Manager + 4 more | Find emails |
| belugacdn.com | #28,326 | AdRoll, AngularJS, Bootstrap + 25 more | Find emails |
| mediacorp.sg | #28,360 | Adobe Experience Cloud (Launch), Amazon Route 53, Cloudinary + 6 more | Find emails |
| ubar.pro | #28,366 | Bootstrap, Google Fonts, Let's Encrypt + 8 more | Find emails |
| ezyvet.com | #28,398 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 15 more | Find emails |
| hidemyass.com | #28,402 | Adyen, Akamai Edge DNS, Akamai edge/CDN + 40 more | Find emails |
| eiu.edu | #28,409 | Adobe Fonts (Typekit), Apache, Bluesky + 8 more | Find emails |
| reactor.cc | #28,410 | Google Analytics, Google Fonts, Let's Encrypt + 5 more | Find emails |
| hotair.com | #28,413 | ASP.NET, Adobe Fonts (Typekit), Amazon Advertising + 18 more | Find emails |
| rcntec.com | #28,423 | Fancybox, Font Awesome, Google Analytics + 6 more | Find emails |
| repsol.com | #28,425 | ASP.NET, Adobe Experience Cloud (Launch), Amazon Route 53 + 11 more | Find emails |
| surl.li | #28,436 | Cloudflare, Cloudflare Turnstile, Cloudflare Web Analytics + 6 more | Find emails |
| 10be.de | #28,440 | AMP for WP, Bootstrap, DigiCert + 9 more | Find emails |
| aist.go.jp | #28,450 | Amazon CloudFront, Amazon Route 53, DigiCert + 5 more | Find emails |
| xylem.com | #28,467 | Amazon CloudFront, Azure API Management, Cloudflare edge/CDN + 4 more | Find emails |
| nationalmssociety.org | #28,468 | Adyen, AppNexus, BlueKai + 37 more | Find emails |
| framagit.org | #28,476 | Let's Encrypt, Matomo, Ruby on Rails + 1 more | Find emails |
| smoothcomp.com | #28,477 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 7 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 1,000,000-domain Tranco top-1M census (run top1m-2026-08-25-full-v2), snapshot August 29, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →