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 |
|---|---|---|---|
| one.one | #160 | Let's Encrypt, Next.js, React | Find emails |
| pki.goog | #218 | Google Analytics, Google Fonts, Google Tag Manager + 2 more | Find emails |
| t-online.de | #220 | Amazon (ACM), Amazon CloudFront, Envoy + 2 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| #291 |
| Adobe Experience Cloud (Launch), DigiCert, Fastly + 8 more |
| Find emails |
| duckdns.org | #295 | Amazon (ACM), Google Analytics, Google Tag Manager + 4 more | Find emails |
| media.net | #311 | Akamai Edge DNS, Cloudflare edge/CDN, DigiCert + 4 more | Find emails |
| dailymotion.com | #377 | Amazon (ACM), Amazon CloudFront | Find emails |
| time.com | #526 | Fastly, Google Tag Manager, NS1 + 5 more | Find emails |
| teamviewer.com | #561 | Adobe Experience Cloud (Launch), Cloudflare Bot Management, Cloudflare edge/CDN + 6 more | Find emails |
| sharethrough.com | #594 | Amazon Route 53, Cloudflare edge/CDN, Google Tag Manager + 5 more | Find emails |
| klaviyo.com | #597 | Amazon Route 53, Astro, Cloudflare edge/CDN + 8 more | Find emails |
| cdnvideo.ru | #598 | Bootstrap, Fancybox, Font Awesome + 4 more | Find emails |
| fontawesome.com | #626 | Amazon Route 53, Cloudflare edge/CDN, Font Awesome + 6 more | Find emails |
| independent.co.uk | #636 | Cloudflare, Fastly, Google Workspace + 3 more | Find emails |
| mediafire.com | #710 | Amplitude, Cloudflare, Cloudflare Bot Management + 8 more | Find emails |
| uber.com | #737 | ChatGPT Ads Pixel, Cloudflare Bot Management, Cloudflare edge/CDN + 19 more | Find emails |
| gumgum.com | #762 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 6 more | Find emails |
| fiverr.com | #769 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 4 more | Find emails |
| kick.com | #777 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 10 more | Find emails |
| apnews.com | #794 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 9 more | Find emails |
| webmd.com | #871 | Adobe Experience Cloud (Launch), Cloudflare, Cloudflare Bot Management + 6 more | Find emails |
| biblegateway.com | #882 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 6 more | Find emails |
| wyzecam.com | #918 | Bazaarvoice, Cloudflare, Cloudflare edge/CDN + 8 more | Find emails |
| hugedomains.com | #987 | AOS, ASP.NET, Adobe Fonts (Typekit) + 13 more | Find emails |
| pixiv.net | #988 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Ads Conversion + 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 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 →