SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ohsawa-japan.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for ohsawa-japan.co.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- ohsawa-japan.co.jp
- Valid from
- Jul 4, 2026
- Valid until
- Oct 2, 2026 (51 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0557A217E74193A013A1102EA758B50ABB86
- SHA-256 fingerprint
- C3:EC:BA:91:3B:A4:8E:9B:98:B0:E0:46:BC:5B:3C:46:09:52:06:99:6E:B1:D9:0C:D4:65:20:10:2F:1A:87:CC
- 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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