~/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 138 more days.
── output ─────
- Issued to
- costco.com
- Issued by
- DigiCert Global G3 TLS ECC SHA384 2020 CA1
- Valid from
- 2025-09-04
- Valid until
- 2026-09-06 (138 days)
- TLS version
- TLSv1.3
- Cipher
- TLS_AES_256_GCM_SHA384
- Key
- EC (prime256v1) · 256 bit
- Signature
- ecdsa-with-SHA384
- Forward secrecy
- yes
- Self-signed
- no
- Must-staple
- no
- SHA-256 fingerprint
- 4B:FF:F7:23:E5:C7:C3:8A:3A:9E:A8:66:5D:BB:47:3A:C5:9B:86:D9:85:9E:B1:E7:23:26:6C:22:27:87:65:BA
- Serial
- 020818F2B5130A6F93450D13D4755597
subject_alt_names · 2
costco.com
www.costco.com
certificate_chain · 2 certs
[ leaf ]costco.com
138 days left
issuer: DigiCert Global G3 TLS ECC SHA384 2020 CA1
2025-09-04 → 2026-09-06
[ inter ]DigiCert Global G3 TLS ECC SHA384 2020 CA1
1818 days left
issuer: DigiCert Global Root G3
2021-04-14 → 2031-04-13