SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
katata-kango.ac.jp
SSL/TLS Certificate
SSL/TLS Certificate for katata-kango.ac.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- katata-kango.ac.jp
- Valid from
- Jun 25, 2026
- Valid until
- Sep 23, 2026 (54 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05C2E2ECE7A96AB66B7C5E30A528EFBEE2BC
- SHA-256 fingerprint
- 70:09:F5:D8:03:40:D8:6C:32:68:0C:A8:37:78:3D:1D:95:CC:CD:3E:5C:6B:7A:D4:5F:A1:79:B6:7C:01:3B:19
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by katata-kango.ac.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch katata-kango.ac.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, 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.