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 |
|---|---|---|---|
| syri.net | #70,878 | Bootstrap, Cloudflare, Cloudflare Web Analytics + 18 more | Find emails |
| agroplem.ru | #70,879 | Bitrix, Fancybox, Google Fonts + 7 more | Find emails |
| cebit.de | #70,880 | Google Tag Manager, Let's Encrypt, YouTube | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| #70,881 |
| Cloudflare, Cloudflare edge/CDN, Fingerprint Pro + 7 more |
| Find emails |
| traumasoft.com | #70,884 | Font Awesome, Google Analytics, Google Fonts + 12 more | Find emails |
| cedok.cz | #70,910 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 3 more | Find emails |
| playonlinux.com | #70,970 | Apache, Bulma, Font Awesome + 8 more | Find emails |
| nodeping.com | #71,002 | Express, Font Awesome, Google Fonts + 8 more | Find emails |
| prsync.com | #71,019 | ASP.NET, Google Analytics, Google Hosted Libraries + 6 more | Find emails |
| wrap.org.uk | #71,021 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 12 more | Find emails |
| anisuge.tv | #71,025 | Bootstrap, Cloudflare, Cloudflare Web Analytics + 12 more | Find emails |
| seedfinder.eu | #71,030 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 8 more | Find emails |
| floranext.com | #71,044 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 12 more | Find emails |
| teachingbooks.net | #71,051 | Azure DNS, Bluesky, Citrix NetScaler + 11 more | Find emails |
| fastbackgroundcheck.com | #71,053 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| memorialcare.org | #71,071 | Adobe Fonts (Typekit), Azure DNS, BugHerd + 14 more | Find emails |
| zerolifestyle.co | #71,086 | Cloudflare edge/CDN, Google Tag Manager, Judge.me + 7 more | Find emails |
| netline.com | #71,105 | AWS Lambda, AdRoll, Cloudflare edge/CDN + 14 more | Find emails |
| druids.com | #71,112 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 7 more | Find emails |
| doceru.com | #71,136 | Cloudflare, Google Analytics, Google Hosted Libraries + 4 more | Find emails |
| no-ip.net | #71,144 | DigiCert, FirstPromoter, Google Fonts + 6 more | Find emails |
| qti.com | #71,151 | Bootstrap, DigiCert, Font Awesome + 6 more | Find emails |
| covidence.org | #71,155 | Adobe Fonts (Typekit), Amazon CloudFront, Cloudflare Bot Management + 16 more | Find emails |
| secretlab.co | #71,159 | Adobe Fonts (Typekit), Bootstrap, Cloudflare edge/CDN + 18 more | Find emails |
| cleanharbors.com | #71,161 | Akamai edge/CDN, Akamai mPulse, Bootstrap + 17 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 25, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →