SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
takada-jc.ac.jp
SSL/TLS Certificate
SSL/TLS Certificate for takada-jc.ac.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- takada-jc.ac.jp
- Valid from
- Jun 16, 2026
- Valid until
- Sep 14, 2026 (27 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0538AD05CF80BA05672BF45D66AF90B62C34
- SHA-256 fingerprint
- 3D:F8:0B:92:BA:F8:65:F5:54:15:3F:20:C4:94:AB:83:0B:A5:03:28:40:38:94:09:96:65:8F:7C:D8:9B:F2:D9
- Chain
- YR1 → Root YR → 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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