SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
okeya-lab.or.jp
SSL/TLS Certificate
SSL/TLS Certificate for okeya-lab.or.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.okeya-lab.or.jp
- Valid from
- Jun 19, 2026
- Valid until
- Sep 17, 2026 (35 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0559E2ED878E278E62DD289D13F400D7FF39
- SHA-256 fingerprint
- ED:B7:ED:F1:14:CB:76:AA:63:61:2C:1A:72:2F:19:27:4C:02:1C:A3:A7:20:0F:96:AB:EA:98:59:C4:E5:6F:DA
- 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.
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Uptime
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DNS changes
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TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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