SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ja-takaoka.or.jp
SSL/TLS Certificate
SSL/TLS Certificate for ja-takaoka.or.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.ja-takaoka.or.jp
- Valid from
- Jun 14, 2026
- Valid until
- Sep 12, 2026 (33 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05F0A1052EA3AAAF3EC3D7E19B567B840486
- SHA-256 fingerprint
- 7E:1E:61:2C:6B:22:DA:2A:B6:35:B3:1E:E8:0B:D8:FC:18:89:16:29:44:71:87:61:70:5D:FA:4A:2D:0B:20:F5
- 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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