SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
osaka-sci.or.jp
SSL/TLS Certificate
SSL/TLS Certificate for osaka-sci.or.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- osaka-sci.or.jp
- Valid from
- Sep 16, 2026
- Valid until
- Dec 15, 2026 (88 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05BAC5CA5573D80F812F86FEBD69CA2FE25A
- SHA-256 fingerprint
- 3B:20:53:F3:12:BC:60:45:01:70:2B:10:47:D1:51:8E:F4:3B:22:1D:28:84:C9:36:B5:DB:1A:0D:5A:AB:40:74
- 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
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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