SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
niigata-jaog.org
SSL/TLS Certificate
SSL/TLS Certificate for niigata-jaog.org
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.niigata-jaog.org
- Valid from
- Sep 30, 2026
- Valid until
- Dec 29, 2026 (52 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 069904C894822EE704AE5DFF01F0FFBE106C
- SHA-256 fingerprint
- 28:3D:AF:1F:77:C7:70:56:01:FA:B0:C2:28:55:9D:84:03:B3:33:69:79:2F:88:0C:4B:0B:C1:47:51:92:C6:E0
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Oct 3, 2026.
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Uptime
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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.
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