SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
okazaki-kyousei.com
SSL/TLS Certificate
SSL/TLS Certificate for okazaki-kyousei.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- okazaki-kyousei.com
- Valid from
- Aug 21, 2026
- Valid until
- Nov 19, 2026 (31 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06B2342187EB26FE0D78832F6E85A35DE361
- SHA-256 fingerprint
- 0A:F7:B9:1C:AD:B9:2C:90:FC:AA:28:86:48:CC:58:BB:48:07:F1:0D:C0:7F:73:30:AB:C0:1F:E7:63:5C:A9:89
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Sep 21, 2026.
Never get surprised by okazaki-kyousei.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch okazaki-kyousei.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.