CAPTCHA & Bot Protection
90,376 of the 1,000,000 top sites in our Tranco top-1M census run reCAPTCHA (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 | 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 |
|---|---|---|---|
| skyscraperpage.com | #39,453 | Blockthrough, Cloudflare, Cloudflare edge/CDN + 5 more | Find emails |
| videoo.tv | #39,454 | Bootstrap, Chatra, Cloudflare + 13 more | Find emails |
| digiteka.com | #39,460 | Amazon CloudFront, Amazon Route 53, Bootstrap + 13 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| 1001freefonts.com | #39,473 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 8 more | Find emails |
| acponline.org | #39,484 | ASP.NET, Cloudflare, Cloudflare edge/CDN + 11 more | Find emails |
| dteenergy.com | #39,523 | Backbone.js, Bootstrap, Dynatrace + 12 more | Find emails |
| apn.net.au | #39,531 | Apache, Font Awesome, Google Ads Conversion + 9 more | Find emails |
| merlot.org | #39,532 | Amazon Route 53, Bootstrap, Font Awesome + 10 more | Find emails |
| diabetes.co.uk | #39,539 | Cloudflare, Cloudflare edge/CDN, ConsentMo + 15 more | Find emails |
| netnanny.com | #39,546 | Amazon (ACM), Amazon Route 53, Bootstrap + 9 more | Find emails |
| bang.com | #39,550 | Apple Pay, Cloudflare, Cloudflare Web Analytics + 6 more | Find emails |
| nips.cc | #39,560 | Apache, Bootstrap, D3.js + 9 more | Find emails |
| medindia.net | #39,603 | ASP.NET, Bootstrap, Cloudflare + 9 more | Find emails |
| clickhouse.cloud | #39,606 | Amazon Route 53, Let's Encrypt, Vercel | Find emails |
| umcs.pl | #39,613 | Apache, DoubleClick (Google Ads), Google Ads Conversion + 8 more | Find emails |
| roanoke.com | #39,616 | Amazon Advertising, Apache, AppNexus + 32 more | Find emails |
| castify.ai | #39,618 | Adobe Fonts (Typekit), Bootstrap, Cloudflare + 13 more | Find emails |
| lnwshop.com | #39,648 | Google Analytics, Google Tag Manager, Google Workspace + 7 more | Find emails |
| ikmultimedia.com | #39,649 | Adobe Fonts (Typekit), Amazon (ACM), Bootstrap + 9 more | Find emails |
| shelter.org.uk | #39,658 | Amazon Route 53, Contentful, Gatsby + 5 more | Find emails |
| snl.no | #39,661 | Google Cloud DNS, Hotwire Turbo, Let's Encrypt + 4 more | Find emails |
| readpeak.com | #39,663 | Apache, Bootstrap, Google Analytics + 10 more | Find emails |
| prodirectsport.com | #39,666 | Adobe Fonts, Adobe Fonts (Typekit), Bazaarvoice + 9 more | Find emails |
| cdjapan.co.jp | #39,694 | Fancybox, Font Awesome, Google Ads Conversion + 6 more | Find emails |
| adme.ru | #39,700 | Amazon Advertising, Amazon Route 53, DoubleClick (Google Ads) + 8 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-2026-08-24-full), snapshot August 24, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →