~/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 60 more days.
── output ─────
- Issued to
- openai.com
- Issued by
- WE1
- Valid from
- 2026-03-23
- Valid until
- 2026-06-21 (60 days)
- TLS version
- TLSv1.3
- Cipher
- TLS_AES_256_GCM_SHA384
- Key
- EC (prime256v1) · 256 bit
- Signature
- ecdsa-with-SHA256
- Forward secrecy
- yes
- Self-signed
- no
- Must-staple
- no
- SHA-256 fingerprint
- F0:1C:39:AF:1E:EB:02:86:A4:F8:D6:47:52:A9:BE:58:DD:5E:D6:72:7B:F0:D3:13:79:F5:92:F3:06:33:F4:16
- Serial
- 0DDDBEB8D2B6F57213A051A841B9AA4E
subject_alt_names · 2
openai.com
*.openai.com
certificate_chain · 3 certs
[ leaf ]openai.com
60 days left
issuer: WE1
2026-03-23 → 2026-06-21
[ inter ]WE1
1035 days left
issuer: GTS Root R4
2023-12-13 → 2029-02-20
[ inter ]GTS Root R4
646 days left
issuer: GlobalSign Root CA
2023-11-15 → 2028-01-28