SSL/TLS Certificates
33,361 of the 1,000,000 top sites in our Tranco top-1M census run Sectigo (3.3%). 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.
Other ssl/tls certificates
| # | 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 |
|---|---|---|---|
| transip.nl | #3,416 | Nginx | Find emails |
| samsunghealth.com | #3,420 | Amazon CloudFront, Amazon Route 53, Amazon S3 | Find emails |
| directnic.com | #3,436 | Bootstrap, DoubleClick (Google Ads), Font Awesome + 11 more | Find emails |
| #150 (Tranco) |
| Find emails |
| 5 | avast.com | #202 (Tranco) | Find emails |
| #3,442 |
| Amazon CloudFront, Astro, Cloudflare Bot Management + 7 more |
| Find emails |
| domaintools.com | #3,455 | AWS Lambda, Bluesky, Cloudflare edge/CDN + 3 more | Find emails |
| lse.ac.uk | #3,509 | Google Fonts, Microsoft 365, Swiper + 3 more | Find emails |
| brightcloud.com | #3,514 | Akamai edge/CDN, Akamai mPulse | Find emails |
| flixcdn.com | #3,574 | Cloudflare, Nginx | Find emails |
| avg.com | #3,585 | Adobe Experience Cloud (Launch), Adobe Target, Akamai Edge DNS + 25 more | Find emails |
| ansa.it | #3,600 | DoubleClick (Google Ads), Fancybox, Google Publisher Tag + 6 more | Find emails |
| servidoresdns.net | #3,623 | Apache | Find emails |
| qualcomm.com | #3,655 | Adobe Experience Cloud (Launch), Cloudflare Bot Management, Cloudflare Web Analytics + 7 more | Find emails |
| monash.edu | #3,663 | Cloudflare Bot Management, Cloudflare Turnstile, Cloudflare edge/CDN | Find emails |
| tesco.com | #3,677 | Akamai edge/CDN | Find emails |
| apkpure.com | #3,682 | Cloudflare, Cloudflare Bot Management, Cloudflare Turnstile + 2 more | Find emails |
| planfix.ru | #3,801 | AdRoll, AddToAny, All in One SEO + 13 more | Find emails |
| comodo.com | #3,804 | Font Awesome, Google Fonts, Google Tag Manager + 9 more | Find emails |
| jbl.com | #3,831 | Amazon Route 53, Cloudflare Web Analytics, Cloudflare edge/CDN + 1 more | Find emails |
| arbeitsagentur.de | #3,855 | Apache, Next.js, React | Find emails |
| tds.net | #3,862 | Microsoft Clarity, Nginx, Taboola + 2 more | Find emails |
| penguinrandomhouse.com | #3,888 | Amazon CloudFront, Amazon Route 53, Google Hosted Libraries + 6 more | Find emails |
| unhcr.org | #3,893 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| nos.nl | #3,901 | Amazon CloudFront, Amazon Route 53, Microsoft 365 + 6 more | Find emails |
| register.it | #3,912 | AMP for WP, Bootstrap, Font Awesome + 11 more | Find emails |
| srv53.com | #3,916 | Google Fonts, Nginx | 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 →