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 |
|---|---|---|---|
| cbr.com | #5,007 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| thinkwithgoogle.com | #5,010 | Google Analytics, Google Fonts, Google Tag Manager + 2 more | Find emails |
| namebright.com | #5,060 | Amazon CloudFront, Cloudflare, Cloudflare edge/CDN + 4 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| makeuseof.com | #5,093 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| copper6.com | #5,159 | Cloudflare edge/CDN, Google Analytics, Google Cloud DNS + 4 more | Find emails |
| nato.int | #5,205 | Adobe Fonts (Typekit), Akamai Edge DNS, Fastly + 6 more | Find emails |
| acer.com | #5,305 | Akamai Bot Manager, Akamai mPulse, Amazon Route 53 + 9 more | Find emails |
| uconn.edu | #5,324 | Font Awesome, Google Fonts, Google Tag Manager + 5 more | Find emails |
| kijiji.ca | #5,396 | Google AdSense, Google Cloud DNS, Google Publisher Tag + 4 more | Find emails |
| secondlife.com | #5,444 | Akamai Edge DNS, Cloudflare edge/CDN, DigiCert + 4 more | Find emails |
| tradeinn.com | #5,448 | Fancybox, Google Cloud DNS, Google Fonts + 5 more | Find emails |
| ipsos.com | #5,469 | Cloudflare, Cloudflare Bot Management, Cloudflare Web Analytics + 9 more | Find emails |
| braintreegateway.com | #5,481 | Braintree, Cloudflare Bot Management, Cloudflare Web Analytics + 5 more | Find emails |
| rand.org | #5,511 | Adobe Experience Cloud (Launch), Amazon (ACM), Amazon CloudFront + 4 more | Find emails |
| sgnic.sg | #5,601 | ASP.NET, AngularJS, Bootstrap + 6 more | Find emails |
| net-line.pro | #5,662 | GSAP, OpenResty, PHP + 4 more | Find emails |
| telenet.be | #5,711 | Adobe Audience Manager, Adobe Experience Cloud (Launch), Cloudflare Bot Management + 7 more | Find emails |
| sonnenbatterie.de | #5,814 | Cloudflare edge/CDN, Google Tag Manager, Google Trust Services + 5 more | Find emails |
| mixi.jp | #5,942 | Amazon Route 53, Google AdSense, Google Analytics + 4 more | Find emails |
| adme.media | #6,018 | Amazon Advertising, Amazon Route 53, Google Analytics + 5 more | Find emails |
| ngs.ru | #6,031 | DDoS-Guard, Let's Encrypt | Find emails |
| fourseasons.com | #6,106 | Akamai Bot Manager, Akamai mPulse, DigiCert + 4 more | Find emails |
| fontanka.ru | #6,113 | DDoS-Guard, Let's Encrypt | Find emails |
| formstack.com | #6,119 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 10 more | Find emails |
| taboolanews.com | #6,128 | DigiCert, Fastly, Google Analytics + 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 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 →