SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
kenyu-kan.jp
SSL/TLS Certificate
SSL/TLS Certificate for kenyu-kan.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- kenyu-kan.jp
- Valid from
- Jun 27, 2026
- Valid until
- Sep 25, 2026 (60 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 052C542F89AFC3FAC1D8ABC295504BB42D5A
- SHA-256 fingerprint
- C7:3F:8D:0B:13:92:A1:8F:02:30:9A:FA:90:AB:3F:2D:26:5A:F6:AC:4A:08:E1:1A:92:EF:61:3B:2A:D8:45:4E
- 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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