SSL/TLS Certificates
30,905 of the 1,000,000 top sites in our Tranco top-1M census run Sectigo (3.1%). A certificate authority that issues SSL/TLS certificates used to secure websites with HTTPS. Detection is homepage-level HTML/header fingerprinting, so a site can run Sectigo on other pages without it showing here.
| # | Domain | Global traffic rank | Contacts |
|---|---|---|---|
| 1 | github.com | #29 (Tranco) | Find emails |
| 2 | roblox.com | #73 (Tranco) | Find emails |
| 3 | nginx.com | #95 (Tranco) | Find emails |
| 4 | f5.com |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| gpk.eu | #37,730 | Cloudflare Bot Management, Cloudflare Turnstile, Cloudflare edge/CDN | Find emails |
| a79ab95c1589a13f8a4cab612bc71f9f7.com | #37,731 | Amazon CloudFront, Amazon S3, NS1 | Find emails |
| cbsnewsstatic.com | #37,752 | Fastly, NS1, Varnish | Find emails |
| #150 (Tranco) |
| Find emails |
| 5 | avast.com | #202 (Tranco) | Find emails |
| clearscore.com |
| #37,757 |
| Cloudflare, Cloudflare edge/CDN, PerimeterX (HUMAN) |
| Find emails |
| itglobal.com | #37,822 | Nginx, PHP, WordPress + 1 more | Find emails |
| vertiv.com | #37,837 | ASP.NET, Azure API Management, CSC (Digital Brand Services) + 4 more | Find emails |
| reutersconnect.com | #37,871 | AB Tasty, Amazon CloudFront, Next.js + 3 more | Find emails |
| umpquabank.com | #37,897 | Cloudflare Bot Management, Cloudflare Turnstile, Cloudflare edge/CDN + 2 more | Find emails |
| innity.com | #37,907 | Apache, Bootstrap, Font Awesome + 13 more | Find emails |
| uptrends.com | #37,942 | ASP.NET, Amazon Route 53, Azure API Management + 4 more | Find emails |
| royalholloway.ac.uk | #37,945 | ASP.NET, Adobe Fonts (Typekit), Azure API Management + 8 more | Find emails |
| ameritas.com | #37,965 | BrightEdge, Google Fonts, WooCommerce + 2 more | Find emails |
| networkoperations.nl | #38,021 | Apache, Google Tag Manager, Microsoft 365 + 1 more | Find emails |
| sfera.net | #38,089 | Font Awesome, Google Fonts, Imperva + 5 more | Find emails |
| lufthansagroup.com | #38,101 | Cloudflare Bot Management, Cloudflare Turnstile, Cloudflare edge/CDN | Find emails |
| twt.it | #38,137 | Cookiebot, Font Awesome, Google Fonts + 9 more | Find emails |
| lmt.lv | #38,140 | Cloudflare Bot Management, Cloudflare edge/CDN, Nuxt.js + 1 more | Find emails |
| ultimedia.com | #38,147 | Amazon Route 53, Bootstrap, Fancybox + 7 more | Find emails |
| outbyte.com | #38,167 | Amazon Route 53, Bootstrap, Google Analytics + 11 more | Find emails |
| rememberthemilk.com | #38,172 | Amazon CloudFront, Amazon Route 53, Azure DNS + 16 more | Find emails |
| manulife.ca | #38,182 | Adobe Experience Cloud (Launch), Akamai Bot Manager, Akamai Edge DNS + 5 more | Find emails |
| bournemouth.ac.uk | #38,205 | Cloudflare Bot Management, Cloudflare Turnstile, Cloudflare edge/CDN + 1 more | Find emails |
| uach.mx | #38,210 | Bootstrap, Fancybox, Font Awesome + 6 more | Find emails |
| sim-networks.com | #38,221 | AOS, Cloudflare Turnstile, Font Awesome + 11 more | Find emails |
| cyberfuel.com | #38,234 | Bootstrap, Google Fonts, Google Tag Manager + 9 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-2026-08-24-full), snapshot August 24, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →