SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
oosawa-jidosya.jp
SSL/TLS Certificate
SSL/TLS Certificate for oosawa-jidosya.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- oosawa-jidosya.jp
- Valid from
- Oct 23, 2026
- Valid until
- Jan 21, 2027 (73 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0669F10FAF2EF967CD205C88DBDA0EB69737
- SHA-256 fingerprint
- 54:0F:07:74:6B:97:59:60:EB:9B:E1:1A:D2:EF:5B:3B:79:7A:A6:5F:55:2A:53:B8:CB:0B:60:9C:66:83:75:CF
- 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.
This certificate has been served since Sep 20, 2026.
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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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