SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
t-sta.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for t-sta.co.jp
Valid- Issued by (CA)
- Japan Registry Services Co., Ltd.
- Subject
- www.t-sta.co.jp
- Valid from
- Nov 17, 2025
- Valid until
- Nov 30, 2026 (128 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 025835F1A9916A72797FD8038C36BE3B
- SHA-256 fingerprint
- 8E:1D:D0:19:4D:40:F7:2F:1C:06:A8:9E:59:C1:C3:ED:5C:44:D5:9C:3B:11:69:14:E0:44:9E:C3:54:4C:CD:74
- Chain
- JPRS Domain Validation Authority - G4
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by t-sta.co.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch t-sta.co.jp continuously, notifying you the moment anything moves across all three signals:
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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