SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
gen-jp.org
SSL/TLS Certificate
SSL/TLS Certificate for gen-jp.org
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- gen-jp.org
- Valid from
- Jul 26, 2026
- Valid until
- Oct 24, 2026 (29 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0504E01CFD8C571611F405130CFE24809E36
- SHA-256 fingerprint
- 50:65:3F:11:09:98:C0:8B:0C:62:8C:3E:50:A0:8C:74:D5:12:B0:DC:D8:12:F6:8F:B4:59:5E:51:1C:5B:28:BC
- 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 gen-jp.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch gen-jp.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.
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