~/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 150 more days.
── output ─────
- Issued to
- www.kpn.com
- Issued by
- Sectigo Public Server Authentication CA DV R36
- Valid from
- 2025-08-18
- Valid until
- 2026-09-18 (150 days)
- TLS version
- TLSv1.3
- Cipher
- TLS_AES_128_GCM_SHA256
- Key
- RSA · 2048 bit
- Signature
- sha256WithRSAEncryption
- Forward secrecy
- yes
- Self-signed
- no
- Must-staple
- no
- SHA-256 fingerprint
- 29:18:89:D4:83:D0:69:53:72:93:00:1F:D0:5D:B8:9B:5C:AC:69:17:4F:DB:97:76:65:5E:86:97:01:B1:3D:D8
- Serial
- 10A63298E4E13DF3063C98E7ADBA5C37
subject_alt_names · 4
www.kpn.com
kpn.com
kpn.nl
www.kpn.nl
certificate_chain · 2 certs
[ leaf ]www.kpn.com
150 days left
issuer: Sectigo Public Server Authentication CA DV R36
2025-08-18 → 2026-09-18
[ inter ]Sectigo Public Server Authentication CA DV R36
3622 days left
issuer: Sectigo Public Server Authentication Root R46
2021-03-22 → 2036-03-21