SSL Grade Leaderboard: Top 100 Websites
Scanned from 20,000 top global websites · Updated 2026-11-07
| # | Domain | Grade | Score | 30d trend | Δ | TLS | Issuer | HSTS | Expires |
|---|---|---|---|---|---|---|---|---|---|
| 5751 | onshape.com | A+ | 100 | — | – | TLS1.3 | Amazon RSA 2048 M04 | 60 d | |
| 5752 | ontario.ca | A+ | 100 | — | – | TLS1.3 | DigiCert Global G2 TLS RSA SHA256 2020 CA1 | 152 d | |
| 5753 | openai.com | A+ | 100 | TLS1.3 | Google Trust Services | 38 d | |||
| 5754 | opencorporates.com | A+ | 100 | — | – | TLS1.3 | Google Trust Services | 59 d | |
| 5755 | openculture.com | A+ | 100 | — | – | TLS1.3 | SSL.com TLS Issuing RSA CA R1 | 182 d | |
| 5756 | opengameart.org | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 43 d | |
| 5757 | openid.net | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 58 d | |
| 5758 | openlearning.com | A+ | 100 | — | – | TLS1.3 | GeoTrust TLS RSA CA G1 | 115 d | |
| 5759 | openmole.org | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 30 d | |
| 5760 | openpetition.de | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 48 d | |
| 5761 | openresty.com | A+ | 100 | — | – | TLS1.3 | ZeroSSL RSA DV SSL CA 2 | 46 d | |
| 5762 | openresty.org | A+ | 100 | — | – | TLS1.3 | ZeroSSL RSA DV SSL CA 2 | 60 d | |
| 5763 | openreview.net | A+ | 100 | — | – | TLS1.3 | Google Trust Services | 56 d | |
| 5764 | opensearch.org | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 60 d | |
| 5765 | opensocietyfoundations.org | A+ | 100 | — | – | TLS1.3 | Amazon RSA 2048 M01 | 182 d | |
| 5766 | openssl.org | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 66 d | |
| 5767 | openstreetmap.org | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 54 d | |
| 5768 | opnsense.org | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 87 d | |
| 5769 | oppo.com | A+ | 100 | — | – | TLS1.3 | GeoTrust G2 TLS CN RSA4096 SHA256 2022 CA1 | 85 d | |
| 5770 | oprahdaily.com | A+ | 100 | — | – | TLS1.3 | GlobalSign Atlas R46 DV TLS CA 2026 Q4 | 196 d | |
| 5771 | optimizely.com | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 76 d | |
| 5772 | optimole.com | A+ | 100 | — | – | TLS1.3 | Amazon RSA 2048 M04 | 87 d | |
| 5773 | orange.es | A+ | 100 | — | – | TLS1.3 | DigiCert G2 TLS EU RSA4096 SHA384 2022 CA1 | 120 d | |
| 5774 | orange.fr | A+ | 100 | — | – | TLS1.3 | DigiCert Global G2 TLS RSA SHA256 2020 CA1 | 57 d | |
| 5775 | ordnancesurvey.co.uk | A+ | 100 | — | – | TLS1.3 | DigiCert Global G2 TLS RSA SHA256 2020 CA1 | 60 d | |
| 5776 | orias.fr | A+ | 100 | — | – | TLS1.3 | GandiCert | 50 d | |
| 5777 | orkin.com | A+ | 100 | — | – | TLS1.3 | Thawte TLS RSA CA G1 | 62 d | |
| 5778 | orlandoweekly.com | A+ | 100 | — | – | TLS1.3 | Google Trust Services | 33 d | |
| 5779 | ornl.gov | A+ | 100 | — | – | TLS1.3 | Google Trust Services | 59 d | |
| 5780 | osce.org | A+ | 100 | — | – | TLS1.3 | GlobalSign GCC R46 AlphaSSL CA 2025 | 189 d | |
| 5781 | osf.io | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 69 d | |
| 5782 | osha.gov | A+ | 100 | — | – | TLS1.3 | Amazon RSA 2048 M04 | 126 d | |
| 5783 | osram.com | A+ | 100 | — | – | TLS1.3 | RapidSSL TLS RSA CA G1 | 127 d | |
| 5784 | osxdaily.com | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 87 d | |
| 5785 | otr-online.ru | A+ | 100 | — | – | TLS1.3 | GlobalSign RSA OV SSL CA 2018 | 107 d | |
| 5786 | ottawacitizen.com | A+ | 100 | — | – | TLS1.3 | Google Trust Services | 34 d | |
| 5787 | otto.de | A+ | 100 | — | – | TLS1.3 | DigiCert Global G2 TLS RSA SHA256 2020 CA1 | 129 d | |
| 5788 | oulu.fi | A+ | 100 | — | – | TLS1.3 | GEANT TLS ECC 1 | 118 d | |
| 5789 | ouraring.com | A+ | 100 | — | – | TLS1.3 | Amazon RSA 2048 M01 | 124 d | |
| 5790 | ourworldindata.org | A+ | 100 | — | – | TLS1.3 | Google Trust Services | 29 d | |
| 5791 | outbrain.com | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 28 d | |
| 5792 | outdooractive.com | A+ | 100 | — | – | TLS1.3 | Thawte TLS RSA CA G1 | 70 d | |
| 5793 | outlook.com | A+ | 100 | – | TLS1.3 | DigiCert Global G2 TLS RSA SHA256 2020 CA1 | 174 d | ||
| 5794 | outlook.live.com | A+ | 100 | TLS1.3 | DigiCert Global G2 TLS RSA SHA256 2020 CA1 | 174 d | |||
| 5795 | outlook.office.com | A+ | 100 | – | TLS1.3 | DigiCert Global G2 TLS RSA SHA256 2020 CA1 | 174 d | ||
| 5796 | outsideonline.com | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 85 d | |
| 5797 | over-blog.com | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 66 d | |
| 5798 | overcast.fm | A+ | 100 | — | – | TLS1.3 | Let's Encrypt | 50 d | |
| 5799 | overheid.nl | A+ | 100 | — | – | TLS1.3 | certSIGN Web CA G2 | 135 d | |
| 5800 | overleaf.com | A+ | 100 | — | – | TLS1.3 | Google Trust Services | 74 d |
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FAQ
How often is the SSL leaderboard updated?
Watched domains are scanned daily; the top-20K leaderboard refreshes full snapshots every Sunday.
How is the SSL grade calculated?
Protocol versions, cipher strength, certificate validity, HSTS and OCSP stapling are weighted into a 0-100 score, mapped to grades from A+ to F.
What does an A+ SSL rating mean?
A near-perfect TLS setup: TLS 1.3 enabled, strong cipher suites, full forward secrecy (PFS) and correctly deployed HSTS.
Methodology
CertH grades each domain via pure TLS handshakes (no server access required): certificate validity, key strength, protocol versions, HSTS and OCSP stapling are scored with a deduction model (100 minus itemized penalties) into a 0-100 score mapped to six grades from A+ to F. Daily snapshots accumulate into an auditable health trend.
What is an SSL grade?
An SSL grade (A+ through F) evaluates a website's overall TLS configuration: protocol versions, cipher strength, certificate validity and trust chain, HSTS and OCSP stapling. A higher grade means stronger resistance to man-in-the-middle attacks and data breaches.
Why track certificate health over time?
Expired certificates, CA switches and configuration regressions can silently drag a grade down. CertH daily snapshots record those changes so you can spot risk before failures, with auditable history as evidence.