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 |
|---|---|---|---|
| xmission.com | #12,746 | Bootstrap, DigiCert, Google Analytics + 9 more | Find emails |
| aweber.com | #12,753 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 5 more | Find emails |
| governmentjobs.com | #12,754 | ASP.NET, Amazon Route 53, DigiCert + 6 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| ottera.tv | #12,764 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 8 more | Find emails |
| irishexaminer.com | #12,808 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 11 more | Find emails |
| constellix.net | #12,868 | Adobe Experience Cloud (Launch), DigiCert, Fastly + 8 more | Find emails |
| above.com | #12,934 | Bootstrap, Font Awesome, Google Analytics + 10 more | Find emails |
| england.nhs.uk | #12,946 | Amazon (ACM), Amazon CloudFront, Google Analytics + 7 more | Find emails |
| michaelkors.com | #12,976 | Adobe Experience Cloud (Launch), Adobe Fonts (Typekit), Akamai Bot Manager + 13 more | Find emails |
| simpleflying.com | #13,007 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| ipip.net | #13,035 | Bootstrap, Cloudflare edge/CDN, Google Trust Services + 4 more | Find emails |
| resy.com | #13,037 | Amazon Route 53, DigiCert, Imperva + 3 more | Find emails |
| dovendi.com | #13,059 | Google Analytics, Google Tag Manager, Let's Encrypt + 1 more | Find emails |
| nanosystems.com | #13,170 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 4 more | Find emails |
| regulations.gov | #13,211 | Amazon CloudFront, DigiCert, Nginx + 1 more | Find emails |
| fluidplayer.com | #13,229 | Bootstrap, Font Awesome, Google Analytics + 5 more | Find emails |
| nic.lv | #13,266 | Let's Encrypt, reCAPTCHA v2 | Find emails |
| tlauncher.org | #13,314 | Cloudflare, DDoS-Guard, PHP + 2 more | Find emails |
| wrike.com | #13,362 | Cloudflare, Cloudflare edge/CDN, Google Tag Manager + 2 more | Find emails |
| rapidapi.com | #13,365 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 3 more | Find emails |
| premiumtimesng.com | #13,406 | Cloudflare, Cloudflare edge/CDN, Font Awesome + 5 more | Find emails |
| dandb.com | #13,413 | Akamai mPulse, Amazon Route 53, Cloudflare Bot Management + 11 more | Find emails |
| unesp.br | #13,421 | Font Awesome, Foundation, Google Fonts + 8 more | Find emails |
| zxyvrtd.com | #13,511 | GoDaddy Website Builder, GoDaddy | Find emails |
| sensibo.com | #13,621 | Cloudflare edge/CDN, Convert, Google Fonts + 9 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 →