SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

kosyu.or.jp

SSL/TLS Certificate

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SSL/TLS Certificate for kosyu.or.jp

Valid
Issued by (CA)
Let's Encrypt
Subject
www.kosyu.or.jp
Valid from
Jun 13, 2026
Valid until
Sep 11, 2026 (51 days remaining)
Public key
RSA 2048-bit
Serial
064466F232B623DA64CB3D7A50676124B187
SHA-256 fingerprint
37:65:7C:80:7E:A3:58:39:8A:2C:F5:C2:ED:6E:66:CB:42:E2:55:ED:71:60:BA:06:75:5C:39:9F:4F:41:AC:3C
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (2)
kosyu.or.jp, www.kosyu.or.jp

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.