SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
koukoku.jp
SSL/TLS Certificate
SSL/TLS Certificate for koukoku.jp
Valid- Issued by (CA)
- GlobalSign nv-sa
- Subject
- www.koukoku.jp
- Valid from
- Jun 12, 2026
- Valid until
- Dec 28, 2026 (83 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 2C5AC2A9F7C1CF46D98A0177
- SHA-256 fingerprint
- CC:CD:5C:48:37:56:40:BA:C8:F3:F8:9C:93:1A:AE:45:CD:18:3C:CB:A9:F3:78:00:F7:F4:61:1B:84:A1:59:1E
- Chain
- GlobalSign GCC R3 EV TLS CA 2025 → GlobalSign
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 23, 2026.
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Uptime
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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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