SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
cdc-de.ac.jp
SSL/TLS Certificate
SSL/TLS Certificate for cdc-de.ac.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.cdc-de.ac.jp
- Valid from
- Oct 15, 2026
- Valid until
- Jan 13, 2027 (86 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05A2026A4DD7556A365D3067A4C9D1013D75
- SHA-256 fingerprint
- F2:E1:D1:57:01:2F:5F:52:AD:01:1C:76:6D:CA:F0:AE:F8:20:33:3E:D4:B7:28:C9:C7:99:A9:94:6F:42:5D:DB
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Oct 19, 2026.
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Uptime
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DNS changes
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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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