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 |
|---|---|---|---|
| contaazul.com | #38,731 | Amazon CloudFront, Amazon Route 53, Next.js + 1 more | Find emails |
| tlauncher.ru | #38,760 | DDoS-Guard, PHP, reCAPTCHA v2 | Find emails |
| socastsrm.com | #38,761 | Amazon (ACM), Bootstrap, Cloudflare + 7 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| cashbackeasy.com |
| #38,799 |
| Amazon CloudFront, Cloudflare, Cloudflare edge/CDN + 6 more |
| Find emails |
| zan.top | #38,831 | Google Analytics, Google Tag Manager, Microsoft Clarity + 4 more | Find emails |
| hostcreators.sk | #38,836 | Font Awesome, Google Tag Manager, Let's Encrypt + 5 more | Find emails |
| blockclubchicago.org | #38,881 | Google Analytics, Google Publisher Tag, Google Tag Manager + 9 more | Find emails |
| uplandsoftware.com | #38,883 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 11 more | Find emails |
| coned.com | #38,929 | DigiCert, Google Fonts, Google Tag Manager + 2 more | Find emails |
| lcl.fr | #38,955 | Akamai Edge DNS, Sectigo, Angular | Find emails |
| paymo.ru | #39,032 | Bootstrap, Cloudflare, Let's Encrypt + 4 more | Find emails |
| joinroot.com | #39,040 | Amazon (ACM), Amazon CloudFront, Cloudflare + 7 more | Find emails |
| qortex.ai | #39,067 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 5 more | Find emails |
| roboflow.com | #39,129 | Ashby, Cloudflare edge/CDN, Google Analytics + 6 more | Find emails |
| powster.com | #39,171 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 4 more | Find emails |
| altn.com | #39,185 | Cloudflare edge/CDN, Google Fonts, Google Tag Manager + 8 more | Find emails |
| stablehost.com | #39,197 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 19 more | Find emails |
| floorplanner.com | #39,284 | Amazon Route 53, Next.js, Sectigo + 3 more | Find emails |
| yarnspirations.com | #39,288 | Amazon Route 53, Bazaarvoice, Cloudflare edge/CDN + 7 more | Find emails |
| skyairline.com | #39,322 | Cloudflare, Cloudflare Bot Management, Cloudflare Web Analytics + 9 more | Find emails |
| kentuckyderby.com | #39,447 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 1 more | Find emails |
| snapar.com | #39,451 | Amazon Route 53, Contentful, FullStory + 14 more | Find emails |
| apn.net.au | #39,531 | Font Awesome, Google Ads Conversion, Google Analytics + 6 more | Find emails |
| netnanny.com | #39,546 | Amazon (ACM), Amazon Route 53, Bootstrap + 7 more | Find emails |
| clickhouse.cloud | #39,606 | Amazon Route 53, Let's Encrypt, Vercel | 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 →