SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
seiei-chouri.ac.jp
SSL/TLS Certificate
SSL/TLS Certificate for seiei-chouri.ac.jp
Valid- Issued by (CA)
- DigiCert Inc
- Subject
- seiei-chouri.ac.jp
- Valid from
- Oct 29, 2025
- Valid until
- Oct 28, 2026 (72 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0F948D52F5D7A61DA0EA1568EC371C31
- SHA-256 fingerprint
- 9F:21:EC:33:C1:3C:74:B0:3D:4A:04:2E:32:CB:DD:8D:49:DB:45:25:38:A0:78:2F:44:F9:EE:C4:96:83:08:E4
- Chain
- Encryption Everywhere DV TLS CA - G2 → DigiCert Global Root G2
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by seiei-chouri.ac.jp's certificate expiring
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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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