SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
you-ok.jp
SSL/TLS Certificate
SSL/TLS Certificate for you-ok.jp
Valid- Issued by (CA)
- Japan Registry Services Co., Ltd.
- Subject
- you-ok.jp
- Valid from
- Oct 5, 2025
- Valid until
- Oct 31, 2026 (28 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 3CDA4D38621EEBA8B0D89466A2EA188E
- SHA-256 fingerprint
- 83:1A:AC:8E:FD:F8:0C:4D:C4:2A:81:1D:96:94:02:D4:92:BD:E8:E4:DE:06:E7:2A:1D:6F:F7:F1:44:CD:5C:27
- 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.
This certificate has been served since Sep 28, 2026.
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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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