~/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 219 more days.
── output ─────
- Issued to
- 1und1.de
- Issued by
- Sectigo Public Server Authentication CA OV R36
- Valid from
- 2025-11-26
- Valid until
- 2026-11-26 (219 days)
- TLS version
- TLSv1.3
- Cipher
- TLS_AES_256_GCM_SHA384
- Key
- RSA · 4096 bit
- Signature
- sha256WithRSAEncryption
- Forward secrecy
- yes
- Self-signed
- no
- Must-staple
- no
- SHA-256 fingerprint
- F9:77:D2:1A:64:FA:89:88:C8:61:55:F6:51:24:42:B9:AC:CA:AA:75:40:7B:7A:B9:C4:59:EA:96:AF:E6:88:B2
- Serial
- D8E259A529FEDB8FFEBEA464629A1DD1
subject_alt_names · 2
1und1.de
www.1und1.de
certificate_chain · 4 certs
[ leaf ]1und1.de
219 days left
issuer: Sectigo Public Server Authentication CA OV R36
2025-11-26 → 2026-11-26
[ inter ]Sectigo Public Server Authentication CA OV R36
3622 days left
issuer: Sectigo Public Server Authentication Root R46
2021-03-22 → 2036-03-21
[ inter ]Sectigo Public Server Authentication Root R46
4290 days left
issuer: USERTrust RSA Certification Authority
2021-03-22 → 2038-01-18
[ inter ]USERTrust RSA Certification Authority
985 days left
issuer: AAA Certificate Services
2019-03-12 → 2028-12-31