SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ookubo-k.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for ookubo-k.co.jp
Self-signed- Issued by (CA)
- Plesk
- Subject
- Plesk
- Valid from
- Mar 7, 2023
- Valid until
- Mar 6, 2024 (expired 917 days ago)
- Public key
- RSA 2048-bit
- Serial
- 6406E0F9
- SHA-256 fingerprint
- 15:E5:C3:1F:6C:0D:27:5D:67:F2:11:BC:E7:8F:C2:31:A2:64:9C:56:42:5F:C9:0A:B9:F7:C3:CF:11:F5:8C:67
- Chain
- Plesk
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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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
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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