SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
j-test.jp
SSL/TLS Certificate
SSL/TLS Certificate for j-test.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.j-test.jp
- Valid from
- Jun 7, 2026
- Valid until
- Sep 5, 2026 (37 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06AABFB5DEBE44125C9B85B89B989D52B552
- SHA-256 fingerprint
- CD:CF:DB:A0:24:6F:D4:3D:DC:CB:33:60:09:9A:C4:01:C1:E7:E4:30:CE:52:BA:BC:FC:C2:06:52:0E:47:37:94
- 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.
Never get surprised by j-test.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch j-test.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.
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