~/tools / ssl-checker

SSL Checker

Check SSL certificate expiry, chain validity, TLS version and cipher. Catches expired certs, weak crypto and chain issues.

>
[ OK ] Valid for 43 more days.
── output ─────
Issued to
github.com
Issued by
Sectigo Public Server Authentication CA DV E36
Valid from
2026-03-06
Valid until
2026-06-03 (43 days)
TLS version
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256
Key
EC (prime256v1) · 256 bit
Signature
ecdsa-with-SHA256
Forward secrecy
yes
Self-signed
no
Must-staple
no
SHA-256 fingerprint
97:16:D3:94:41:CA:65:1C:51:BE:78:E9:69:CA:38:5E:C2:13:EC:17:71:5B:8C:91:F0:1E:E6:52:F9:0F:C6:2C
Serial
1DC289C1EADAFB04E9D1CF53D5D72253
subject_alt_names · 2
github.com www.github.com
certificate_chain · 3 certs
[ leaf ]github.com
43 days left
issuer: Sectigo Public Server Authentication CA DV E36
2026-03-06 → 2026-06-03
[ inter ]Sectigo Public Server Authentication CA DV E36
3622 days left
issuer: Sectigo Public Server Authentication Root E46
2021-03-22 → 2036-03-21
[ inter ]Sectigo Public Server Authentication Root E46
4290 days left
issuer: USERTrust ECC Certification Authority
2021-03-22 → 2038-01-18
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