SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
kobo-akamatsu.jp
SSL/TLS Certificate
SSL/TLS Certificate for kobo-akamatsu.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- kobo-akamatsu.jp
- Valid from
- Jun 6, 2026
- Valid until
- Sep 4, 2026 (37 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05C605DC1E6D670FF45B9C6F16995E1A8283
- SHA-256 fingerprint
- 62:FE:2A:6A:E5:E0:A4:E8:99:D0:75:0B:E8:C1:8E:39:5A:91:82:AC:C7:54:95:52:70:F9:75:1F:2F:EF:D6:FC
- 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.
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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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