SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for libru.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- libru.jp
- Valid from
- Jul 2, 2026
- Valid until
- Sep 30, 2026 (71 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 057F4E010EA3127CA9C851D6B8F0E39969CE
- SHA-256 fingerprint
- FA:A6:4C:35:E9:D2:5B:0A:29:74:BA:18:65:7D:36:A3:38:05:71:35:18:7A:2D:91:A1:A5:4B:B3:48:D6:9D:E6
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.