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 |
|---|---|---|---|
| worldofbooks.com | #17,014 | Cloudflare edge/CDN, Google Cloud DNS, Let's Encrypt + 6 more | Find emails |
| wponetap.com | #17,040 | Apache, Brevo, DigiCert + 10 more | Find emails |
| eightfold.ai | #17,045 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 10 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| refiner.io | #17,050 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 19 more | Find emails |
| wwnorton.com | #17,061 | Amazon Route 53, Bluesky, DigiCert + 8 more | Find emails |
| tcpshield.com | #17,067 | Amazon CloudFront, Atlassian Cloud, Atlassian Statuspage + 18 more | Find emails |
| catholic.net | #17,068 | Atlassian Statuspage, DoubleClick (Google Ads), Fancybox + 13 more | Find emails |
| geocities.ws | #17,098 | Cloudflare Web Analytics, Cloudflare edge/CDN, Fancybox + 9 more | Find emails |
| highcharts.com | #17,100 | Cloudflare, Cloudflare edge/CDN, Convert + 5 more | Find emails |
| junglescout.com | #17,104 | ActiveCampaign, Cloudflare, Cloudflare edge/CDN + 28 more | Find emails |
| creema.jp | #17,115 | Amazon (ACM), Cloudflare, Font Awesome + 6 more | Find emails |
| aena.es | #17,128 | Adobe Experience Cloud (Launch), Akamai edge/CDN, Akamai mPulse + 9 more | Find emails |
| hallmark.com | #17,130 | Adobe Experience Cloud (Launch), Akamai Bot Manager, Cloudflare edge/CDN + 7 more | Find emails |
| plati.market | #17,137 | Bootstrap, DDoS-Guard, Fancybox + 2 more | Find emails |
| nwf.org | #17,138 | Bootstrap, Cloudflare, CrazyEgg + 17 more | Find emails |
| voxexchange.io | #17,145 | Bitrix, Cloudflare, Google Fonts + 5 more | Find emails |
| no-ip.biz | #17,167 | DigiCert, FirstPromoter, Google Fonts + 6 more | Find emails |
| plus.net | #17,172 | Apache, DigiCert, Dynatrace + 8 more | Find emails |
| skills.google | #17,217 | Google Analytics, Google Cloud DNS, Google Fonts + 9 more | Find emails |
| ecomdata.de | #17,230 | Font Awesome, Google Fonts, Google Tag Manager + 9 more | Find emails |
| masters.com | #17,234 | Adobe Experience Cloud (Launch), Akamai Bot Manager, Akamai Edge DNS + 5 more | Find emails |
| mezmo.com | #17,236 | AWS Lambda, Adopt, Amazon Route 53 + 5 more | Find emails |
| diariodenavarra.es | #17,252 | Amazon (ACM), Amazon Advertising, Amazon CloudFront + 14 more | Find emails |
| umb.edu | #17,280 | Amazon (ACM), Amazon CloudFront, Apache + 8 more | Find emails |
| thenational.ae | #17,286 | Cloudflare, Let's Encrypt, Microsoft 365 + 2 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 →