SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
waseda-osaka.jp
SSL/TLS Certificate
SSL/TLS Certificate for waseda-osaka.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- waseda-osaka.jp
- Valid from
- Sep 9, 2026
- Valid until
- Dec 8, 2026 (36 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05F0E653ED6A19BCA297AFAEAB43A5DCD280
- SHA-256 fingerprint
- 09:65:73:80:4B:98:9D:68:D4:89:AD:BC:2B:B4:61:09:97:4A:5A:58:19:6F:E0:39:5C:73:89:65:8E:98:30:95
- 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.
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Uptime
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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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