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 |
|---|---|---|---|
| cloudsmith.io | #24,630 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 15 more | Find emails |
| adforge.io | #24,661 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 4 more | Find emails |
| rcvlink.com | #24,673 | DigiCert, Google Ads Conversion, Google Analytics + 7 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| transifex.com | #24,697 | Adobe Fonts (Typekit), Amazon CloudFront, Amazon Route 53 + 21 more | Find emails |
| sirv.com | #24,771 | Amazon Route 53, Campaign Monitor, Font Awesome + 16 more | Find emails |
| ultraviewer.net | #24,778 | ASP.NET, Google Analytics, Google Fonts + 8 more | Find emails |
| travis-ci.org | #24,789 | Atlassian Statuspage, Bootstrap, Cloudflare + 18 more | Find emails |
| campusshoes.com | #24,819 | Amazon Advertising, Cloudflare edge/CDN, Font Awesome + 11 more | Find emails |
| ipv64.net | #24,853 | Apache, Bootstrap, CleanTalk + 15 more | Find emails |
| versace.com | #24,866 | Akamai Bot Manager, Akamai edge/CDN, Akamai mPulse + 10 more | Find emails |
| dokumen.pub | #24,884 | Bootstrap, Cloudflare, Cloudflare Web Analytics + 10 more | Find emails |
| jokerandwitch.com | #24,905 | Cloudflare edge/CDN, GoKwik, Google Ads Conversion + 13 more | Find emails |
| habrahabr.ru | #24,918 | Google Fonts, Qrator, Sectigo + 1 more | Find emails |
| granicus.com | #24,938 | Adobe Fonts (Typekit), Amazon CloudFront, Amazon Route 53 + 20 more | Find emails |
| ni.net.tr | #24,951 | DoubleClick (Google Ads), Google Fonts, Sectigo + 1 more | Find emails |
| terimawa.com | #24,971 | Cloudflare, Cloudflare edge/CDN, Font Awesome + 3 more | Find emails |
| usinternet.com | #24,989 | Apache, DigiCert, Google Ads Conversion + 6 more | Find emails |
| pecom.ru | #24,993 | Bitrix, Bootstrap, Google Fonts + 11 more | Find emails |
| maalmasti.com | #25,017 | All in One SEO, Cloudflare, Cloudflare edge/CDN + 8 more | Find emails |
| bilinfo.net | #25,021 | ASP.NET, Amazon (ACM), Amazon CloudFront + 4 more | Find emails |
| bookstime.com | #25,033 | Amazon (ACM), Amazon CloudFront, Cloudflare + 4 more | Find emails |
| alkaramstudio.com | #25,036 | Cloudflare edge/CDN, Google Trust Services, Mailchimp + 6 more | Find emails |
| xirsys.com | #25,046 | Amazon Route 53, Apache, Bootstrap + 9 more | Find emails |
| yorkshirepost.co.uk | #25,066 | Cloudflare Bot Management, Cloudflare edge/CDN, Dotmetrics + 9 more | Find emails |
| standsapp.org | #25,105 | Google Analytics, Google Fonts, Google Tag Manager + 9 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 →