~/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 179 more days.
── output ─────
Issued to
telekom.de
Issued by
Amazon ECDSA 384 M04
Valid from
2026-04-16
Valid until
2026-10-30 (179 days)
TLS version
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256
Key
EC (secp384r1) · 384 bit
Signature
ecdsa-with-SHA384
Forward secrecy
yes
Self-signed
no
Must-staple
no
SHA-256 fingerprint
4F:C3:85:C8:27:E1:27:EF:02:21:BD:E4:D9:13:20:84:A6:D1:6D:05:77:27:F5:4E:C7:3C:3A:51:12:CD:03:BD
Serial
0459F457297779875BA934C254529CBA
subject_alt_names · 1
telekom.de
certificate_chain · 3 certs
[ leaf ]telekom.de
179 days left
issuer: Amazon ECDSA 384 M04
2026-04-16 → 2026-10-30
[ inter ]Amazon ECDSA 384 M04
1572 days left
issuer: Amazon Root CA 4
2022-08-23 → 2030-08-23
[ inter ]Amazon Root CA 4
4259 days left
issuer: Starfield Services Root Certificate Authority - G2
2015-05-25 → 2037-12-31
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