CAPTCHA & Bot Protection
3,100 of the 1,000,000 top sites in our Tranco top-1M census run AWS WAF CAPTCHA (0.3%). Amazon's CAPTCHA challenge product, part of AWS WAF's bot-mitigation features. Detection is homepage-level HTML/header fingerprinting, so a site can run AWS WAF CAPTCHA on other pages without it showing here.
Other captcha & bot protection
| # | Domain | Global traffic rank | Contacts |
|---|---|---|---|
| 1 | amazon.com | #25 (Tranco) | Find emails |
| 2 | imdb.com | #237 (Tranco) | Find emails |
| 3 | appsflyer.com | #302 (Tranco) | Find emails |
| 4 | amazon.co.uk |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| nmsu.edu | #14,197 | AOS, AWS WAF, Amazon CloudFront + 18 more | Find emails |
| quizizz.com | #14,236 | AWS WAF, Amazon (ACM), Amazon CloudFront + 1 more | Find emails |
| kalshi.com | #14,969 | Cloudflare, Google Tag Manager, Let's Encrypt + 6 more | Find emails |
| #313 (Tranco) |
| Find emails |
| 5 | checkpoint.com | #338 (Tranco) | Find emails |
| iec.ch |
| #15,044 |
| AWS WAF, Amazon (ACM), Amazon CloudFront + 2 more |
| Find emails |
| doximity.com | #15,201 | Amazon CloudFront, Amazon Route 53, Bugsnag + 6 more | Find emails |
| vectorstock.com | #15,271 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 4 more | Find emails |
| exploratorium.edu | #15,301 | AWS WAF, Amazon (ACM), Amazon CloudFront + 1 more | Find emails |
| sae.org | #15,385 | Adobe Fonts, Adobe Fonts (Typekit), Amazon (ACM) + 8 more | Find emails |
| drugabuse.gov | #15,542 | AWS WAF, Amazon Web Services | Find emails |
| trabajo.org | #15,606 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 3 more | Find emails |
| gc.com | #15,675 | AWS Lambda, Adobe Fonts (Typekit), Amazon (ACM) + 18 more | Find emails |
| whattoexpect.com | #15,757 | AWS WAF, Amazon (ACM), Amazon Route 53 + 1 more | Find emails |
| sixflags.com | #15,775 | AB Tasty, Amazon Route 53, Google Tag Manager + 7 more | Find emails |
| fanvue.com | #15,831 | AWS Lambda, AWS WAF, Amazon (ACM) + 21 more | Find emails |
| uea.ac.uk | #15,851 | AWS WAF, Amazon (ACM), Microsoft 365 | Find emails |
| pagerduty.com | #15,855 | Amazon CloudFront, Amazon Route 53, Amazon S3 + 20 more | Find emails |
| 2ememain.be | #15,990 | Adform, Amazon (ACM), Amazon CloudFront + 8 more | Find emails |
| emag.hu | #16,127 | Amazon (ACM), Amazon CloudFront, NS1 | Find emails |
| rdcu.be | #16,179 | AWS WAF, Amazon (ACM), Amazon Web Services + 1 more | Find emails |
| glovoapp.com | #16,267 | AWS WAF, Amazon (ACM), Amazon CloudFront + 1 more | Find emails |
| flowroute.com | #16,304 | AWS WAF, AdRoll, Amazon CloudFront + 26 more | Find emails |
| espn.co.uk | #16,382 | AWS WAF, Amazon CloudFront, Amazon Route 53 + 1 more | Find emails |
| reservix.de | #16,411 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 3 more | Find emails |
| snkrdunk.com | #16,533 | AWS WAF, Amazon (ACM), Amazon CloudFront + 6 more | Find emails |
| the-scientist.com | #16,660 | AWS WAF, Amazon (ACM), Amazon CloudFront | Find emails |
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 →