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 |
|---|---|---|---|
| availity.com | #15,183 | Amazon CloudFront, Atlassian Cloud, Atlassian Statuspage + 16 more | Find emails |
| boardhost.com | #15,184 | Apache, Let's Encrypt, jQuery | Find emails |
| doximity.com | #15,201 | Amazon CloudFront, Amazon Route 53, Bugsnag + 6 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| isweb.co.kr |
| #15,218 |
| Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 12 more |
| Find emails |
| bitflyer.com | #15,226 | ASP.NET, Akamai Bot Manager, Akamai Edge DNS + 11 more | Find emails |
| doodles.google | #15,234 | Google Cloud, Google Fonts, Google Tag Manager + 2 more | Find emails |
| jetsmart.com | #15,253 | Azure API Management, DigiCert, DoubleClick (Google Ads) + 10 more | Find emails |
| reurl.cc | #15,292 | AnyMind Group, Axios, Bootstrap + 13 more | Find emails |
| voipstunt.com | #15,304 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 6 more | Find emails |
| bodybuilding.com | #15,325 | Cloudflare, Cloudflare edge/CDN, ConsentMo + 13 more | Find emails |
| screencastify.com | #15,358 | AWS Lambda, Amazon CloudFront, Atlassian Cloud + 23 more | Find emails |
| freedns.si | #15,390 | Apache, Bootstrap, Google Analytics + 5 more | Find emails |
| gamesindustry.biz | #15,411 | Amazon Advertising, Chartbeat, Confiant + 9 more | Find emails |
| estrepublicain.fr | #15,438 | AT Internet, ConsentMo, Didomi + 2 more | Find emails |
| getcontact.com | #15,462 | Amazon Route 53, Google Tag Manager, Google Trust Services + 5 more | Find emails |
| flutter.dev | #15,485 | Bluesky, Fastly, Google Analytics + 6 more | Find emails |
| realpage.com | #15,508 | Akamai Bot Manager, Akamai edge/CDN, DigiCert + 5 more | Find emails |
| learnosity.com | #15,531 | 6sense, Amazon CloudFront, Amazon Route 53 + 22 more | Find emails |
| centralnic-dns.com | #15,551 | Cloudflare edge/CDN, CookieYes, Google Trust Services + 2 more | Find emails |
| safaricom.co.ke | #15,554 | Amazon CloudFront, Bootstrap, DigiCert + 17 more | Find emails |
| nu.com.mx | #15,572 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 9 more | Find emails |
| hugoboss.com | #15,597 | Adyen, Akamai Bot Manager, Akamai edge/CDN + 13 more | Find emails |
| groups.io | #15,601 | Amazon CloudFront, Atlassian Cloud, Atlassian Statuspage + 10 more | Find emails |
| london.gov.uk | #15,604 | Cloudflare, Cloudflare edge/CDN, Drupal + 7 more | Find emails |
| cvshealth.com | #15,614 | Adobe Experience Cloud (Launch), Akamai Edge DNS, Amazon CloudFront + 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 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 →