CAPTCHA & Bot Protection
56,649 of the 965,200 top sites in our Tranco top-1M census run reCAPTCHA (5.9%). 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 | one.one | #160 (Tranco) | Find emails |
| 2 | pki.goog | #218 (Tranco) | Find emails |
| 3 | t-online.de | #220 (Tranco) | Find emails |
| 4 | dnsmadeeasy.com |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| onegreenplanet.org | #36,344 | Bootstrap, Cloudflare, Font Awesome + 10 more | Find emails |
| everskies.com | #36,362 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 4 more | Find emails |
| thecentersquare.com | #36,366 | Google Fonts, Google Publisher Tag, Google Tag Manager + 4 more | Find emails |
| #291 (Tranco) |
| Find emails |
| 5 | duckdns.org | #295 (Tranco) | Find emails |
| uniroma3.it | #36,441 | Font Awesome, Google Fonts, Microsoft 365 + 2 more | Find emails |
| brownells.com | #36,468 | Azure DNS, Cloudflare edge/CDN, DigiCert + 5 more | Find emails |
| upgradedpoints.com | #36,507 | Cloudflare, Fastly, Gatsby + 7 more | Find emails |
| homehardware.ca | #36,518 | Cloudflare edge/CDN, Contentful, Google Tag Manager + 5 more | Find emails |
| lejsl.com | #36,565 | ConsentMo, DigiCert, Google Tag Manager + 1 more | Find emails |
| swanndvr.net | #36,570 | ASP.NET, Google Fonts, Let's Encrypt + 2 more | Find emails |
| ctt.pt | #36,571 | Cloudflare Bot Management, Cloudflare edge/CDN, Google Tag Manager + 7 more | Find emails |
| feeder.co | #36,577 | Cloudflare, Intercom, Nginx + 3 more | Find emails |
| flyingtiger.com | #36,602 | CSC (Digital Brand Services), Cloudflare edge/CDN, ConsentMo + 17 more | Find emails |
| aspec-auto.ru | #36,612 | Let's Encrypt, OpenResty | Find emails |
| lalsace.fr | #36,630 | ConsentMo, Google Tag Manager, reCAPTCHA v2 | Find emails |
| cps.edu | #36,664 | ASP.NET, Cloudflare edge/CDN, Font Awesome + 3 more | Find emails |
| adalyser.com | #36,687 | AOS, DigiCert, Google Tag Manager + 5 more | Find emails |
| ixirhost.com | #36,695 | Font Awesome, Google Analytics, Google Fonts + 6 more | Find emails |
| environment.gov.au | #36,757 | Akamai Bot Manager, Drupal, Google Analytics + 5 more | Find emails |
| malaga.eu | #36,814 | Bootstrap, Google Tag Manager, Meta Pixel + 1 more | Find emails |
| calgary.ca | #36,851 | Adobe Experience Cloud (Launch), Bootstrap, CrazyEgg + 9 more | Find emails |
| vitekivpddns.com | #36,866 | ASP.NET, Google Fonts, Let's Encrypt + 2 more | Find emails |
| server-eye.de | #36,959 | Adobe Fonts (Typekit), Cloudflare, ConsentMo + 4 more | Find emails |
| nuveen.com | #37,014 | Akamai Bot Manager, Akamai Edge DNS, DigiCert + 5 more | Find emails |
| comic-con.org | #37,062 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 7 more | Find emails |
| finanzen.ch | #37,111 | Azure DNS, DigiCert, Google Tag Manager + 3 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 965,200-domain Tranco top-1M census (run top1m-2026-08-20-full), snapshot August 21, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →