SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sokai-book.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for sokai-book.co.jp
Valid- Issued by (CA)
- Nijimo, Inc.
- Subject
- www.sokai-book.co.jp
- Valid from
- Jul 30, 2026
- Valid until
- Feb 13, 2027 (102 days remaining)
- Public key
- RSA 2048-bit
- Serial
- B3FA8A7195B0568D1B694150C64FC49C
- SHA-256 fingerprint
- 4D:4F:92:67:AD:38:60:C9:AF:17:FA:EC:EF:74:02:B5:B4:CA:F7:96:03:5F:73:E0:53:65:5B:E0:85:09:59:E3
- 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.
Never get surprised by sokai-book.co.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sokai-book.co.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, 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.