SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
seino-co.com
SSL/TLS Certificate
SSL/TLS Certificate for seino-co.com
Hostname mismatch- Issued by (CA)
- Nijimo, Inc.
- Subject
- *.jan.ne.jp
- Valid from
- Mar 13, 2026
- Valid until
- Sep 27, 2026 (67 days remaining)
- Public key
- RSA 2048-bit
- Serial
- CC088C104750FF718A9D54F95406522D
- SHA-256 fingerprint
- BB:70:ED:F2:9F:04:14:D9:2F:76:EE:6C:9C:3B:BF:82:CA:03:04:6F:99:8A:16:4F:7B:6D:B0:C4:A5:55:63:30
- Chain
- FujiSSL RSA Domain Validation Secure Server CA 2 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
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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