SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
uonuma-school.com
SSL/TLS Certificate
SSL/TLS Certificate for uonuma-school.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- uonuma-school.com
- Valid from
- Nov 5, 2026
- Valid until
- Feb 3, 2027 (84 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06F8F6F5A82EB975D11552C8C24FFE09793C
- SHA-256 fingerprint
- 06:7A:34:2B:14:A1:8D:BC:62:27:11:52:F8:82:F5:4C:B2:47:0D:8C:EE:46:8F:EA:D5:A5:66:A7:53:58:FC:9C
- 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.
This certificate has been served since Sep 24, 2026.
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This is today's certificate. Turn on monitoring and we'll watch uonuma-school.com 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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