SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
jac-edu.jp
SSL/TLS Certificate
SSL/TLS Certificate for jac-edu.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- jac-edu.jp
- Valid from
- Aug 31, 2026
- Valid until
- Nov 29, 2026 (82 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 058F01F47440284E181138ED09B4036D42B8
- SHA-256 fingerprint
- 0B:5C:E2:01:E9:7F:57:19:9C:9B:5C:22:6B:17:09:77:A2:0D:06:E9:40:9B:8C:9E:5C:7E:2F:1D:97:46:B5:57
- 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 jac-edu.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch jac-edu.jp continuously, notifying you the moment anything moves across all three signals:
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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