CAPTCHA & Bot Protection
90,376 of the 1,000,000 top sites in our Tranco top-1M census run reCAPTCHA (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 | 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 |
|---|---|---|---|
| nic.baby | #39,703 | Amazon (ACM), Apache, Google Fonts + 5 more | Find emails |
| lauradate.com | #39,705 | Cloudflare, Cloudflare edge/CDN, Fingerprint Pro + 7 more | Find emails |
| singulart.com | #39,712 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 5 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| rctech.net | #39,717 | Amazon Advertising, Cloudflare, Cloudflare Web Analytics + 15 more | Find emails |
| aimtell.com | #39,734 | Amazon (ACM), Amazon Route 53, Apache + 26 more | Find emails |
| learnupon.com | #39,747 | Amazon Route 53, Cloudflare edge/CDN, Google Tag Manager + 3 more | Find emails |
| thulo.com | #39,773 | Axios, Bootstrap, Google Analytics + 10 more | Find emails |
| alternatehistory.com | #39,797 | Cloudflare, Cloudflare edge/CDN, ConsentMo + 3 more | Find emails |
| getnetset.com | #39,826 | All in One SEO, Amazon (ACM), Amazon CloudFront + 7 more | Find emails |
| inoc.net | #39,829 | Apache, Google Analytics, Google Fonts + 4 more | Find emails |
| myshiptracking.com | #39,883 | ASP.NET, Cloudflare, Cloudflare Web Analytics + 7 more | Find emails |
| sefaria.org | #39,905 | Cloudflare, Cloudflare Bot Management, Cloudflare Turnstile + 23 more | Find emails |
| clevescene.com | #39,920 | Broadstreet, Google Analytics, Google Fonts + 11 more | Find emails |
| applicantpro.com | #39,928 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 8 more | Find emails |
| bits.media | #39,932 | Google Analytics, Google Tag Manager, Let's Encrypt + 5 more | Find emails |
| truthdig.com | #39,938 | Adobe Fonts (Typekit), Chartbeat, Cloudflare + 8 more | Find emails |
| muz.li | #39,948 | Google Fonts, Let's Encrypt, Nuxt.js + 2 more | Find emails |
| likeevideo.com | #39,971 | Amazon Route 53, Kong, Nginx + 2 more | Find emails |
| zombeek.cz | #39,972 | Bootstrap, Chart.js, Font Awesome + 11 more | Find emails |
| revy.io | #39,978 | Cloudflare, Cloudflare edge/CDN, Font Awesome + 10 more | Find emails |
| leatherman.com | #39,990 | Azure DNS, Cloudflare edge/CDN, Let's Encrypt + 5 more | Find emails |
| uspreventiveservicestaskforce.org | #40,019 | Amazon (ACM), Apache, Azure DNS + 5 more | Find emails |
| doorkeeper.jp | #40,089 | Envoy, Font Awesome, Google Analytics + 7 more | Find emails |
| vgchartz.com | #40,112 | Apache, Bootstrap, Feedburner + 8 more | Find emails |
| negate.io | #40,121 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 1 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-2026-08-24-full), snapshot August 24, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →