SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
okamoto-clinic.jp
SSL/TLS Certificate
SSL/TLS Certificate for okamoto-clinic.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- okamoto-clinic.jp
- Valid from
- Sep 26, 2026
- Valid until
- Dec 25, 2026 (43 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05E5A6F1A0B70D4DE8C35BECBF9D2BFC13EA
- SHA-256 fingerprint
- 84:3A:1E:C9:E2:35:38:86:5E:9F:78:EA:06:B3:40:25:39:27:B4:48:01:81:CC:E4:44:03:AB:8E:A1:19:BA:F3
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Oct 9, 2026.
Never get surprised by okamoto-clinic.jp's certificate expiring
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Uptime
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DNS changes
We watch NS, MX, CAA, CNAME, TXT and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
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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