SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
pat-net.ne.jp
SSL/TLS Certificate
SSL/TLS Certificate for pat-net.ne.jp
Expired- Issued by (CA)
- Let's Encrypt
- Subject
- pat-net.ne.jp
- Valid from
- Mar 14, 2026
- Valid until
- Jun 12, 2026 (expired 63 days ago)
- Public key
- RSA 2048-bit
- Serial
- 05F3B38768ED9E12BE53DC737C42A33998EC
- SHA-256 fingerprint
- 4E:57:50:C5:65:EF:D3:52:42:C8:F8:1E:05:B9:4D:B1:79:35:AE:30:AE:A2:50:7B:37:40:6A:B7:A7:1B:60:39
- Chain
- R12 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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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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