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 |
|---|---|---|---|
| adstag0102.xyz | #27,071 | Bootstrap, Cloudflare, Font Awesome + 7 more | Find emails |
| carbuzz.com | #27,097 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| versobooks.com | #27,118 | Adobe Fonts (Typekit), Amazon Route 53, Cloudflare edge/CDN + 7 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| givemesport.com | #27,119 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| marchofdimes.org | #27,126 | AddThis, AddToAny, Cloudflare + 13 more | Find emails |
| webself.net | #27,127 | ASP.NET, Adobe Fonts (Typekit), Amazon (ACM) + 20 more | Find emails |
| staradvertiser.com | #27,134 | Adapex, Amazon Route 53, Bootstrap + 18 more | Find emails |
| cisecurity.org | #27,149 | Azure API Management, Bootstrap, Cloudflare + 16 more | Find emails |
| muslimpro.com | #27,178 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 7 more | Find emails |
| sostav.ru | #27,184 | LiveInternet (Yadro), Mail.ru Analytics (Top100), PHP + 7 more | Find emails |
| i-a.co.uk | #27,191 | Google Fonts, Let's Encrypt, Nginx | Find emails |
| 360psg.com | #27,230 | Bootstrap, CallRail, Cloudflare edge/CDN + 23 more | Find emails |
| flyertalk.com | #27,252 | Adobe Fonts (Typekit), Amazon Advertising, Axios + 25 more | Find emails |
| transcy.io | #27,260 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 11 more | Find emails |
| bop.gov | #27,280 | Amazon (ACM), Amazon CloudFront, Cloudflare + 7 more | Find emails |
| nationaleatingdisorders.org | #27,291 | Cloudflare, Cloudflare edge/CDN, ConsentMo + 13 more | Find emails |
| negocio.site | #27,325 | Google Analytics, Google Cloud DNS, Google Fonts + 3 more | Find emails |
| topspeed.com | #27,327 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| screendaily.com | #27,332 | ASP.NET, Amazon (ACM), Amazon Route 53 + 13 more | Find emails |
| thueringen.de | #27,343 | Friendly Captcha, Let's Encrypt, unpkg | Find emails |
| uaudio.com | #27,348 | Amazon Route 53, Cloudflare edge/CDN, DataGrail + 5 more | Find emails |
| archive.li | #27,352 | Let's Encrypt, Nginx, reCAPTCHA v2 | Find emails |
| factorialhr.com | #27,355 | Amazon CloudFront, Cloudflare, Cloudflare Web Analytics + 20 more | Find emails |
| pubtech.ai | #27,363 | Cloudflare, Cloudflare edge/CDN, Fancybox + 10 more | Find emails |
| marketingprofs.com | #27,396 | ASP.NET, Adobe Fonts (Typekit), Bootstrap + 13 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 →