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github.com

TLS 1.3 TLS_AES_128_GCM_SHA256
Leaf Certificate
Subject github.com
Issuer Sectigo Public Server Authentication CA DV E36
Valid From Jul 3, 2026
Valid Until Sep 30, 2026 (45 days)
Algorithm ECDSA-SHA256
Subject Alternative Names
github.comwww.github.com
Intermediate
Subject Sectigo Public Server Authentication CA DV E36
Issuer Sectigo Public Server Authentication Root E46
Valid From Mar 22, 2021
Valid Until Mar 21, 2036 (3505 days)
Algorithm ECDSA-SHA384
Intermediate
Subject Sectigo Public Server Authentication Root E46
Issuer USERTrust ECC Certification Authority
Valid From Mar 22, 2021
Valid Until Jan 18, 2038 (4173 days)
Algorithm ECDSA-SHA384

Findings

✓ TLS 1.3 supported
✓ SSL certificate valid (45 days remaining)
✓ Certificate covers 2 domains (SANs)

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Other reports for github.com

Security Headers
CSP, HSTS, X-Frame-Options grade for this site
DNS Lookup
Query A, AAAA, MX, TXT, NS, CNAME, and SOA records with authoritative timing.
Redirect Checker
Trace the full HTTP redirect chain, flag loops, and surface mixed-content downgrades.

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