SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
kastner-lab.jp
SSL/TLS Certificate
SSL/TLS Certificate for kastner-lab.jp
Valid- Issued by (CA)
- Google Trust Services
- Subject
- kastner-lab.jp
- Valid from
- Sep 19, 2026
- Valid until
- Dec 18, 2026 (46 days remaining)
- Public key
- EC 256-bit
- Serial
- D5D26626853C8886139E2ABEEB2A5DB6
- SHA-256 fingerprint
- 23:47:C0:A5:65:33:13:E7:97:1B:1E:99:F8:0C:0C:DD:46:CA:FF:94:54:65:95:46:DC:2D:D7:FF:45:B8:00:B9
- Chain
- WE1 → GTS Root R4
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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Uptime
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DNS changes
We watch NS, MX, CAA, CNAME, TXT 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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