~/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 76 more days.

── output ─────

Issued to: zeit.de
Issued by: R12
Valid from: 2026-04-08
Valid until: 2026-07-07 (76 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: 7F:12:A5:A9:15:19:BA:36:BA:96:1E:C5:7F:6D:79:F5:A0:DE:89:80:89:5B:61:19:55:42:6E:1C:3A:86:5A:61
Serial: 06096CA6446F7FFA1E11CFEF5A670799EE0B

subject_alt_names · 1

zeit.de

certificate_chain · 2 certs

[ leaf ]zeit.de

76 days left

issuer: R12

2026-04-08 → 2026-07-07

[ inter ]R12

325 days left

issuer: ISRG Root X1

2024-03-13 → 2027-03-12

// Save zeit.de → we'll run this daily and alert on changes. /signup →