SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
zen-yu.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for zen-yu.co.jp
Valid- Issued by (CA)
- Japan Registry Services Co., Ltd.
- Subject
- www.zen-yu.co.jp
- Valid from
- Feb 2, 2026
- Valid until
- Feb 28, 2027 (206 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 327591E9F15D0AD0965A99DF346C62BF
- SHA-256 fingerprint
- 7B:D1:C1:AC:5E:FA:83:68:66:EF:BD:47:0F:97:F6:05:2F:EA:AC:D4:71:25:5A:EF:77:C5:5F:79:28:54:21:AE
- 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 zen-yu.co.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch zen-yu.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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