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.
| # | 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 |
|---|---|---|---|
| earthsky.org | #17,681 | All in One SEO, BigScoots, Bluesky + 12 more | Find emails |
| preyproject.com | #17,715 | AWS Lambda, Cloudflare, Cloudflare edge/CDN + 7 more | Find emails |
| housecallpro.com | #17,729 | All in One SEO, Amazon (ACM), Amazon CloudFront + 13 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| litlife.club | #17,735 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 7 more | Find emails |
| hites.com | #17,739 | Cloudflare edge/CDN, DigiCert, Google Cloud DNS + 4 more | Find emails |
| xasiat.com | #17,749 | Cloudflare, Cloudflare edge/CDN, ExoClick + 3 more | Find emails |
| nova.edu | #17,800 | Apache, Bootstrap, Citrix NetScaler + 14 more | Find emails |
| adestra.com | #17,805 | Cloudflare Bot Management, Cloudflare edge/CDN, Font Awesome + 10 more | Find emails |
| duplichecker.com | #17,812 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 10 more | Find emails |
| louisiana.edu | #17,864 | BrightEdge, Drupal, Fastly + 14 more | Find emails |
| advanceautoparts.com | #17,875 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 7 more | Find emails |
| goo.su | #17,879 | AOS, DDoS-Guard, PHP + 1 more | Find emails |
| telecom.kz | #17,882 | Laravel, Yandex Metrica | Find emails |
| omicsonline.org | #17,888 | Bootstrap, Cloudflare, Cloudflare Web Analytics + 13 more | Find emails |
| singaporepools.com.sg | #17,907 | ASP.NET, Bootstrap, DigiCert + 12 more | Find emails |
| internationalwomensday.com | #17,914 | ASP.NET, Bootstrap, Font Awesome + 9 more | Find emails |
| roberthalf.com | #17,920 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 10 more | Find emails |
| zip.co | #17,921 | Amplitude, Cloudflare, Cloudflare Bot Management + 8 more | Find emails |
| rhombussystems.com | #17,935 | Amazon CloudFront, Amazon Route 53, Chatbase + 7 more | Find emails |
| linuxjournal.com | #17,952 | Bootstrap, Campaign Monitor, Disqus + 8 more | Find emails |
| ielts.org | #17,971 | CSC (Digital Brand Services), Cloudflare Bot Management, Cloudflare edge/CDN + 7 more | Find emails |
| aviso.bz | #18,012 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 13 more | Find emails |
| textexpander.com | #18,019 | AOS, Adobe Fonts (Typekit), Amazon CloudFront + 22 more | Find emails |
| worten.pt | #18,053 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 2 more | Find emails |
| truyen-hentai.com | #18,054 | Cloudflare, Cloudflare edge/CDN, ExoClick + 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 →