SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
a-kenshu.jp
SSL/TLS Certificate
SSL/TLS Certificate for a-kenshu.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.a-kenshu.jp
- Valid from
- Aug 1, 2026
- Valid until
- Oct 30, 2026 (46 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05DE9E28364E68F7D2EAE8000D17287703D3
- SHA-256 fingerprint
- 3E:BC:A5:C3:26:78:FC:F8:32:85:DC:C9:B8:23:66:93:A2:0F:D4:55:B1:86:4E:B0:96:58:35:A3:C7:A7:42:61
- 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.
Never get surprised by a-kenshu.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch a-kenshu.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, 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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