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.
| # | 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 |
|---|---|---|---|
| hf.co | #16,671 | AWS WAF, Amazon (ACM), Amazon CloudFront + 4 more | Find emails |
| passkey.com | #16,820 | 6sense, Adobe Experience Cloud (Launch), Amazon (ACM) + 17 more | Find emails |
| castorama.fr | #16,853 | AWS WAF, Amazon CloudFront, Microsoft 365 | Find emails |
| #313 (Tranco) |
| Find emails |
| 5 | checkpoint.com | #338 (Tranco) | Find emails |
| npo.nl |
| #16,950 |
| ASP.NET, Amazon (ACM), Amazon CloudFront + 4 more |
| Find emails |
| eventbrite.de | #17,094 | AWS WAF, Amazon (ACM), Amazon CloudFront + 19 more | Find emails |
| swarthmore.edu | #17,140 | AWS WAF, Amazon CloudFront | Find emails |
| hsbc.com.hk | #17,693 | AddThis, Amazon CloudFront, Apache + 6 more | Find emails |
| transfermarkt.it | #18,024 | AWS WAF, Amazon CloudFront, Let's Encrypt + 1 more | Find emails |
| zeptonow.com | #18,197 | AWS WAF, Amazon (ACM), Amazon CloudFront + 1 more | Find emails |
| eurostar.com | #18,328 | Amazon Route 53, Didomi, Fastly + 8 more | Find emails |
| fontsquirrel.com | #18,353 | AWS WAF, Amazon (ACM), Amazon CloudFront | Find emails |
| crowdin.net | #18,535 | Amazon (ACM), Amazon Route 53, Astro + 5 more | Find emails |
| backcountry.com | #18,576 | AWS WAF, Amazon (ACM), Amazon CloudFront + 2 more | Find emails |
| openrent.co.uk | #18,595 | AWS WAF, AddToAny, Amazon (ACM) + 16 more | Find emails |
| boohoo.com | #19,031 | AB Tasty, Amazon (ACM), Amazon CloudFront + 3 more | Find emails |
| hsbc.co.uk | #19,067 | Adobe Experience Manager Edge Delivery (Helix RUM), Amazon CloudFront, Apache + 3 more | Find emails |
| eventbrite.it | #19,195 | AWS WAF, Amazon (ACM), Amazon CloudFront + 19 more | Find emails |
| wikitree.com | #19,212 | AWS WAF, Amazon (ACM), Amazon Route 53 + 1 more | Find emails |
| apartmentguide.com | #19,330 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 3 more | Find emails |
| careeronestop.org | #19,457 | ASP.NET, AWS WAF, Amazon (ACM) + 8 more | Find emails |
| chroniclelive.co.uk | #19,541 | AWS WAF, Amazon (ACM), Amazon CloudFront + 1 more | Find emails |
| tecconcursos.com.br | #19,599 | AWS WAF, Amazon (ACM), Amazon Route 53 + 1 more | Find emails |
| adultswim.com | #19,819 | AOS, Adobe Fonts (Typekit), Amazon Route 53 + 8 more | Find emails |
| transfermarkt.com.br | #19,890 | AWS WAF, Amazon CloudFront, Let's Encrypt + 1 more | Find emails |
| mondaq.com | #19,898 | ASP.NET, Amazon (ACM), Amazon CloudFront + 6 more | 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 →