SSL/TLS Certificates
339,096 of the 1,000,000 top sites in our Tranco top-1M census run Let's Encrypt (33.9%). A free, automated certificate authority that issues and renews SSL/TLS certificates for HTTPS. Detection is homepage-level HTML/header fingerprinting, so a site can run Let's Encrypt on other pages without it showing here.
Other ssl/tls certificates
| # | Domain | Global traffic rank | Contacts |
|---|---|---|---|
| 1 | mail.ru | #12 (Tranco) | Find emails |
| 2 | twitter.com | #17 (Tranco) | Find emails |
| 3 | wikipedia.org | #27 (Tranco) | Find emails |
| 4 | wordpress.org |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| treas.gov | #13,656 | Akamai Bot Manager, Akamai edge/CDN, Akamai mPulse + 6 more | Find emails |
| givefreely.com | #13,657 | AppsFlyer, Cloudflare, Cloudflare Web Analytics + 5 more | Find emails |
| sparkfun.com | #13,667 | Amazon Route 53, Fastly, New Relic + 1 more | Find emails |
| #43 (Tranco) |
| Find emails |
| 5 | x.com | #54 (Tranco) | Find emails |
| hathitrust.org | #13,670 | Cloudflare Bot Management, Cloudflare Turnstile, Cloudflare edge/CDN | Find emails |
| qut.edu.au | #13,680 | Cloudflare Bot Management, Cloudflare Turnstile, Cloudflare edge/CDN | Find emails |
| route.com | #13,684 | Amazon Route 53, Next.js, Vercel + 1 more | Find emails |
| homegate.ch | #13,686 | Amazon Route 53, Cloudflare Bot Management, Cloudflare Web Analytics + 2 more | Find emails |
| cargill.com | #13,694 | Adobe Experience Cloud (Launch), Akamai edge/CDN, Amazon Route 53 + 16 more | Find emails |
| merck.com | #13,695 | Brightcove, Google Maps, Google Tag Manager + 12 more | Find emails |
| 17u.cn | #13,697 | Akamai edge/CDN, Akamai mPulse, Baidu Analytics | Find emails |
| mozillazine.org | #13,704 | Apache, Google AdSense, Google Analytics + 2 more | Find emails |
| lionic.com | #13,710 | Hugo, Ionic Framework, Nginx | Find emails |
| sense.com | #13,715 | Adobe Fonts (Typekit), Amazon Route 53, Font Awesome + 9 more | Find emails |
| polymetal.ru | #13,717 | Google Fonts, PHP, Qrator + 1 more | Find emails |
| libertad.link | #13,719 | Hugo, Nginx, jQuery | Find emails |
| nintendolife.com | #13,722 | Amazon Advertising, Bluesky, Cloudflare + 14 more | Find emails |
| redspell.ru | #13,727 | Variti | Find emails |
| odu.edu | #13,731 | Adobe Fonts (Typekit), Bootstrap, Drupal + 12 more | Find emails |
| actionnetwork.org | #13,741 | Action Network, All in One SEO, Cloudflare + 14 more | Find emails |
| nearlyfreespeech.net | #13,748 | Apache, PHP | Find emails |
| ipleak.net | #13,751 | Nginx, jQuery | Find emails |
| ipapi.is | #13,755 | Azure DNS, Bulma, Chart.js + 7 more | Find emails |
| refinery89.com | #13,764 | Apache, Microsoft 365, PHP + 3 more | Find emails |
| aligntech.com | #13,767 | Adobe Fonts (Typekit), Amazon CloudFront, Amazon Route 53 + 7 more | Find emails |
| staffbase.com | #13,769 | Amazon Route 53, Astro, Convert + 4 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 →