SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ota-med.jp
SSL/TLS Certificate
SSL/TLS Certificate for ota-med.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- ota-med.jp
- Valid from
- Sep 20, 2026
- Valid until
- Dec 19, 2026 (44 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 064B2019648BD85734E5CE191F7EEA06A4F6
- SHA-256 fingerprint
- 26:FA:79:FF:89:84:B5:E7:0B:98:4D:15:20:49:05:6D:E3:27:12:1F:16:2C:B6:E3:5B:15:6D:8F:9E:F5:8A:EA
- 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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This is today's certificate. Turn on monitoring and we'll watch ota-med.jp continuously, notifying you the moment anything moves across all three signals:
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, 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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