SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
shimu-ken.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for shimu-ken.co.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- shimu-ken.co.jp
- Valid from
- Jun 29, 2026
- Valid until
- Sep 27, 2026 (66 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 05501D6C00F9D6FBBC0C279164BF7B636FA4
- SHA-256 fingerprint
- 06:38:6E:37:C6:41:CB:74:CD:3C:FA:7C:A9:A3:50:A2:F9:3F:B4:DC:78:61:68:3C:AB:C5:5F:2B:4E:80:DF:D3
- 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
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME 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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