SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
saibunkan.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for saibunkan.co.jp
Valid- Issued by (CA)
- Japan Registry Services Co., Ltd.
- Subject
- saibunkan.co.jp
- Valid from
- Aug 23, 2026
- Valid until
- Jan 31, 2027 (147 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 47EDF45AAF83E2DE8C0E7903F88F553B
- SHA-256 fingerprint
- F1:2A:38:C7:14:74:B9:23:C0:48:A7:79:24:98:0A:3A:B0:2D:EA:3F:8C:32:34:5C:74:3D:EE:E7:35:E0:90:57
- Chain
- JPRS DV RSA CA 2024 G1 → SECOM TLS RSA Root CA 2024
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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