SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ksk-i.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for ksk-i.co.jp
Valid- Issued by (CA)
- GlobalSign nv-sa
- Subject
- www.ksk-i.co.jp
- Valid from
- Feb 28, 2026
- Valid until
- Apr 1, 2027 (148 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 20836D54A6262BEF0B7A5F48
- SHA-256 fingerprint
- 90:6D:61:3F:7B:EC:77:77:77:B7:8C:E9:7D:22:3E:93:BA:6F:82:1E:42:48:23:0A:8A:F6:01:5A:96:98:9A:DF
- Chain
- GlobalSign GCC R6 AlphaSSL 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 Oct 19, 2026.
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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
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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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