~/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 304 more days.

── output ─────

Issued to: www.sfr.fr
Issued by: Thawte TLS RSA CA G1
Valid from: 2026-02-20
Valid until: 2027-02-19 (304 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: 0C:91:67:62:4C:8A:E3:78:B7:90:92:1D:8B:F1:45:2F:A8:28:D8:5C:0A:BF:CC:CD:0D:CD:8E:47:CF:BB:67:E6
Serial: 0E3EE4EE7F95C524DC48CC7B60A58B76

subject_alt_names · 2

www.sfr.fr sfr.fr

certificate_chain · 2 certs

[ leaf ]www.sfr.fr

304 days left

issuer: Thawte TLS RSA CA G1

2026-02-20 → 2027-02-19

[ inter ]Thawte TLS RSA CA G1

559 days left

issuer: DigiCert Global Root G2

2017-11-02 → 2027-11-02

// Save sfr.fr → we'll run this daily and alert on changes. /signup →