SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sg-staff.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for sg-staff.co.jp
Untrusted chain- Issued by (CA)
- Cybertrust Japan Co., Ltd.
- Subject
- www.sg-staff.co.jp
- Valid from
- Oct 29, 2025
- Valid until
- Nov 16, 2026 (91 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 3DFAA21815FAA850C357A02E333C9AED7EE16BCE
- SHA-256 fingerprint
- 05:16:B8:07:D4:BC:AB:C7:CD:27:10:F0:95:8E:C0:23:2A:50:7E:BD:A4:04:E9:0F:12:0C:ED:83:85:88:69:95
- Chain
- —
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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This is today's certificate. Turn on monitoring and we'll watch sg-staff.co.jp continuously, notifying you the moment anything moves across all three signals:
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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