SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
toho-gakuin.org
SSL/TLS Certificate
SSL/TLS Certificate for toho-gakuin.org
Self-signed- Issued by (CA)
- SomeOrganization
- Subject
- tk2-402-42233.vs.sakura.ne.jp
- Valid from
- Oct 27, 2017
- Valid until
- Oct 27, 2018 (expired 2849 days ago)
- Public key
- RSA 2048-bit
- Serial
- 49B3
- SHA-256 fingerprint
- 80:FC:6B:ED:B2:5D:AB:DD:72:51:69:A1:2C:BA:BE:18:8F:4B:76:B5:5C:5F:B0:CF:61:03:A2:01:72:52:F1:3B
- Chain
- —
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 Aug 12, 2026.
Never get surprised by toho-gakuin.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch toho-gakuin.org 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.