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 |
|---|---|---|---|
| usp.br | #3,264 | Font Awesome, Google Analytics, Google Fonts + 4 more | Find emails |
| 4shared.com | #3,340 | Bootstrap, Google Analytics, Google Fonts + 3 more | Find emails |
| salon.com | #3,342 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 7 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| rocketmoney.dev |
| #3,401 |
| Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 3 more |
| Find emails |
| urbandictionary.com | #3,441 | Fastmail, Google Analytics, Google Cloud DNS + 7 more | Find emails |
| standard.co.uk | #3,479 | Amazon Advertising, Cloudflare, Cloudflare Bot Management + 4 more | Find emails |
| cvent.com | #3,511 | 6sense, Adobe Experience Cloud (Launch), Amazon (ACM) + 13 more | Find emails |
| heyzine.com | #3,513 | Cloudflare, Google Identity Services, Let's Encrypt + 1 more | Find emails |
| sprinthost.ru | #3,564 | Bootstrap, Font Awesome, OpenResty + 1 more | Find emails |
| toyota.com | #3,704 | Adobe Audience Manager, Adobe Target, Amazon (ACM) + 8 more | Find emails |
| howtogeek.com | #3,719 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| alltel24.ru | #3,746 | Gatsby, Let's Encrypt, Nginx + 1 more | Find emails |
| zerocdn.com | #3,789 | Let's Encrypt, Nginx | Find emails |
| likee.video | #3,869 | Amazon Route 53, Kong, Nginx + 1 more | Find emails |
| screenrant.com | #3,882 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| opsgenie.com | #3,934 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 3 more | Find emails |
| apnic.net | #3,967 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Tag Manager + 3 more | Find emails |
| tunein.com | #3,971 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 6 more | Find emails |
| backblaze.com | #4,025 | Cloudflare, Cloudflare edge/CDN, GSAP + 9 more | Find emails |
| pa.gov | #4,114 | Adobe Experience Cloud (Launch), Coveo, DigiCert + 7 more | Find emails |
| hyundai.com | #4,128 | Bambuser, Cloudflare Bot Management, Cloudflare edge/CDN + 8 more | Find emails |
| siteground.us | #4,131 | Cookiebot, Google Trust Services, Nginx + 2 more | Find emails |
| joinhoney.com | #4,195 | DigiCert, Google Cloud DNS, PayPal + 1 more | Find emails |
| boardgamegeek.com | #4,196 | Adobe Fonts (Typekit), Cloudflare, Cloudflare edge/CDN + 5 more | Find emails |
| sonicwall.com | #4,222 | Contentstack, Google Tag Manager, Imperva + 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 →