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 |
|---|---|---|---|
| etherscan.io | #4,740 | ASP.NET, Bootstrap, Cloudflare + 16 more | Find emails |
| pp.ua | #4,758 | Google Analytics, Let's Encrypt, Nginx | Find emails |
| oar.net | #4,760 | Drupal, Fastly, Google Analytics + 7 more | Find emails |
| pubnub.com |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| #4,772 |
| Amazon CloudFront, Atlassian Cloud, Atlassian Statuspage + 17 more |
| Find emails |
| drugs.com | #4,776 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 13 more | Find emails |
| meteoblue.com | #4,860 | Cloudflare, Cloudflare edge/CDN, DoubleClick (Google Ads) + 5 more | Find emails |
| directadmin.com | #4,862 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 11 more | Find emails |
| dr.dk | #4,867 | Akamai Edge DNS, Cloudflare edge/CDN, Cookiebot + 6 more | Find emails |
| jbhifi.com.au | #4,873 | Amazon Route 53, Cloudflare edge/CDN, Contentful + 12 more | Find emails |
| infobip.com | #4,892 | Amazon CloudFront, Amazon Route 53, Amplitude + 31 more | Find emails |
| anker-in.com | #4,918 | Alibaba Cloud DNS, Amazon CloudFront, Amazon S3 + 5 more | Find emails |
| overleaf.com | #4,965 | Cloudflare, Google Analytics, Google Tag Manager + 8 more | Find emails |
| streamable.com | #4,977 | Amazon Route 53, Express, Fastly + 10 more | Find emails |
| finanzen.net | #4,999 | Amazon Advertising, Amazon CloudFront, Amazon S3 + 21 more | Find emails |
| netnod.se | #5,001 | Apache, Drupal, Fastly + 11 more | Find emails |
| cbr.com | #5,007 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| cbp.gov | #5,035 | Adyen, Akamai Bot Manager, Akamai Edge DNS + 34 more | Find emails |
| namebright.com | #5,060 | Amazon CloudFront, Amazon S3, Cloudflare + 6 more | Find emails |
| activision.com | #5,083 | Adobe Experience Cloud (Launch), Akamai Edge DNS, Amazon CloudFront + 13 more | Find emails |
| makeuseof.com | #5,093 | Google Analytics, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| trueconf.com | #5,107 | Cloudflare Turnstile, Google Fonts, Google Tag Manager + 9 more | Find emails |
| uservoice.com | #5,129 | AWS Lambda, Adobe Fonts (Typekit), Amazon CloudFront + 20 more | Find emails |
| copper6.com | #5,159 | AWS Lambda, Cloudflare edge/CDN, Google Analytics + 7 more | Find emails |
| guzelhosting.com | #5,185 | Bootstrap, Cloudflare, Cloudflare Web Analytics + 9 more | Find emails |
| gta5-mods.com | #5,203 | Blogger, Cloudflare, Cloudflare Bot Management + 6 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 →