SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
kigaku-ai.fun
SSL/TLS Certificate
SSL/TLS Certificate for kigaku-ai.fun
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- kigaku-ai.fun
- Valid from
- Sep 17, 2026
- Valid until
- Dec 16, 2026 (58 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05948460DE2A558EFCD0BF36D604682DA2D1
- SHA-256 fingerprint
- F6:84:E4:03:62:9D:23:EC:36:A3:87:D7:32:18:38:EB:AA:19:20:18:C7:65:3D:12:6D:1B:C9:A3:65:E6:3D:BA
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
We've observed 1 previous certificate for this host. This certificate has been served since Sep 26, 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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