~/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 162 more days.
── output ─────
- Issued to
- outlook.com
- Issued by
- DigiCert Global G2 TLS RSA SHA256 2020 CA1
- Valid from
- 2026-03-18
- Valid until
- 2026-10-02 (162 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
- 39:4E:11:4F:96:01:99:6C:0A:53:4B:8D:66:4C:90:6B:AB:7C:B6:F7:F5:8C:5F:24:49:F1:34:08:DA:B5:A0:DF
- Serial
- 0590CBD365667F4104A9A2690C5B7C73
subject_alt_names · 20
outlook.com
*.hotmail.com
*.internal.outlook.com
*.live.com
*.office.com
*.office365.com
*.outlook.com
*.outlook.office365.com
attachment.outlook.live.net
attachment.outlook.office.net
attachment.outlook.officeppe.net
attachments.office.net
attachments-sdf.office.net
ccs.login.microsoftonline.com
hotmail.com
mail.services.live.com
office365.com
outlook.office.com
substrate.office.com
substrate-sdf.office.com
certificate_chain · 2 certs
[ leaf ]outlook.com
162 days left
issuer: DigiCert Global G2 TLS RSA SHA256 2020 CA1
2026-03-18 → 2026-10-02
[ inter ]DigiCert Global G2 TLS RSA SHA256 2020 CA1
1801 days left
issuer: DigiCert Global Root G2
2021-03-30 → 2031-03-29