SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
tokuyama-h.ed.jp
SSL/TLS Certificate
SSL/TLS Certificate for tokuyama-h.ed.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- tokuyama-h.ed.jp
- Valid from
- Nov 12, 2026
- Valid until
- Feb 10, 2027 (88 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0639EA5CDCB7381CD3CC751A4D7F9A402ECF
- SHA-256 fingerprint
- 42:3F:F4:8C:94:C3:A5:0A:30:E6:31:FC:09:FB:42:D8:3A:FC:64:9D:94:CB:74:BF:E9:DD:6E:B2:2B:5E:32:25
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by tokuyama-h.ed.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, CNAME, TXT 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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