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.com | #2,131 | Let's Encrypt, Next.js, React | Find emails |
| archive.is | #2,156 | Let's Encrypt, Nginx, reCAPTCHA v2 | Find emails |
| primis.tech | #2,163 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 9 more | Find emails |
| bestbuy.com |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| #2,219 |
| Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 5 more |
| Find emails |
| archive.ph | #2,238 | Let's Encrypt, Nginx, reCAPTCHA v2 | Find emails |
| slate.com | #2,250 | Amazon Advertising, Amazon Route 53, Fastly + 6 more | Find emails |
| traffmonetizer.com | #2,296 | Cloudflare, Font Awesome, Google Fonts + 4 more | Find emails |
| trustedstack.com | #2,307 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 3 more | Find emails |
| asana.com | #2,318 | Amazon Route 53, Google Analytics, Let's Encrypt + 7 more | Find emails |
| useinsider.com | #2,321 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 14 more | Find emails |
| constellix.com | #2,349 | Adobe Experience Cloud (Launch), DigiCert, Fastly + 8 more | Find emails |
| scmp.com | #2,500 | Adobe Fonts (Typekit), Amazon Advertising, Cloudflare + 13 more | Find emails |
| trafficjunky.net | #2,821 | Amazon Route 53, Bootstrap, Google Analytics + 7 more | Find emails |
| narod.ru | #2,869 | Google Analytics, Google Tag Manager, Nginx + 2 more | Find emails |
| loopia.se | #2,882 | Bootstrap, DigiCert, Font Awesome + 4 more | Find emails |
| metro.co.uk | #2,981 | Akamai Edge DNS, Google Fonts, Let's Encrypt + 3 more | Find emails |
| ubereats.com | #3,004 | Adobe Audience Manager, Amazon Advertising, Arkose Labs + 24 more | Find emails |
| dictionary.com | #3,024 | Amazon Advertising, Amazon Route 53, Cloudflare Bot Management + 8 more | Find emails |
| likeevideo.ru | #3,033 | Kong, Nginx, reCAPTCHA v3 | Find emails |
| habr.com | #3,037 | Google Fonts, Sectigo, unpkg | Find emails |
| brookings.edu | #3,047 | Azure DNS, Cloudflare edge/CDN, Google Fonts + 11 more | Find emails |
| onaudience.com | #3,156 | Google Analytics, Google Tag Manager, Nginx + 4 more | Find emails |
| brandbucket.com | #3,191 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 1 more | Find emails |
| ning.com | #3,199 | Amazon Route 53, Cloudflare Turnstile, Google Fonts + 5 more | Find emails |
| myanimelist.net | #3,219 | Akamai Edge DNS, AppsFlyer, DigiCert + 3 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 →