~/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 89 more days.
── output ─────
- Issued to
- linear.app
- Issued by
- WE1
- Valid from
- 2026-05-03
- Valid until
- 2026-08-01 (89 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
- 57:6D:28:36:66:D5:CF:DF:C1:34:C6:EA:8D:3A:0E:95:0C:2B:F3:EB:91:A0:00:6B:92:23:BA:54:EE:71:12:B6
- Serial
- 2DF3C930F6008F3711F24E7D825FA032
subject_alt_names · 2
linear.app
mobile-auth-redirect.linear.app
certificate_chain · 3 certs
[ leaf ]linear.app
89 days left
issuer: WE1
2026-05-03 → 2026-08-01
[ inter ]WE1
1023 days left
issuer: GTS Root R4
2023-12-13 → 2029-02-20
[ inter ]GTS Root R4
634 days left
issuer: GlobalSign Root CA
2023-11-15 → 2028-01-28