SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
kotei-info.jp
SSL/TLS Certificate
SSL/TLS Certificate for kotei-info.jp
Valid- Issued by (CA)
- GlobalSign nv-sa
- Subject
- www.kotei-info.jp
- Valid from
- Oct 17, 2025
- Valid until
- Nov 18, 2026 (94 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 58DEF8B84EE54558520A0070
- SHA-256 fingerprint
- E2:1A:0B:96:47:D4:DB:F3:E4:E5:6F:F3:CB:9E:35:16:39:86:18:71:74:42:09:A2:1D:2F:24:7C:C1:0B:B8:1C
- Chain
- GlobalSign GCC R6 AlphaSSL CA 2025 → GlobalSign → GlobalSign
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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