~/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 72 more days.
── output ─────
- Issued to
- slack.com
- Issued by
- R13
- Valid from
- 2026-04-04
- Valid until
- 2026-07-03 (72 days)
- TLS version
- TLSv1.3
- Cipher
- TLS_AES_256_GCM_SHA384
- Key
- RSA · 2048 bit
- Signature
- sha256WithRSAEncryption
- Forward secrecy
- yes
- Self-signed
- no
- Must-staple
- no
- SHA-256 fingerprint
- 67:BE:C3:76:96:A8:04:37:9F:9A:CA:DB:BD:75:F7:73:92:FE:15:7A:13:6B:5D:37:B7:BD:D3:E6:69:6F:3F:94
- Serial
- 05BD89B1D225CBC9EE966D81EC660D3EAC6A
subject_alt_names · 2
*.slack.com
slack.com
certificate_chain · 2 certs
[ leaf ]slack.com
72 days left
issuer: R13
2026-04-04 → 2026-07-03
[ inter ]R13
325 days left
issuer: ISRG Root X1
2024-03-13 → 2027-03-12