SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ja-sapporo.or.jp
SSL/TLS Certificate
SSL/TLS Certificate for ja-sapporo.or.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.ja-sapporo.or.jp
- Valid from
- Jun 17, 2026
- Valid until
- Sep 15, 2026 (31 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06738F545AD49DCBAF3AADB04B37BA19C96E
- SHA-256 fingerprint
- EA:5B:C2:CF:FF:14:BE:7E:EF:B5:4C:CD:FC:26:44:D4:48:4D:E1:C6:A6:A6:B9:A6:82:B0:90:BD:66:D7:55:DA
- 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.
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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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