SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
a-sapporo.com
SSL/TLS Certificate
SSL/TLS Certificate for a-sapporo.com
Hostname mismatch- Issued by (CA)
- Nijimo, Inc.
- Subject
- cpstyle.jp
- Valid from
- Jun 25, 2026
- Valid until
- Jan 9, 2027 (118 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 7A1CF064F0810DBD19169E194C7DA6D0
- SHA-256 fingerprint
- 62:27:EC:DA:0F:AD:DE:F9:C0:EA:0A:BD:73:8B:08:59:41:A9:43:64:ED:9D:0C:8B:F7:2A:D0:FA:B9:5C:B4:4D
- Chain
- FujiSSL RSA Domain Validation Secure Server CA 2 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
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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