SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
asuna-h.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for asuna-h.co.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.asuna-h.co.jp
- Valid from
- Jul 4, 2026
- Valid until
- Oct 2, 2026 (67 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05FD002F545D9E70E06326A8913831A3643D
- SHA-256 fingerprint
- 35:59:34:6B:92:9B:5D:E9:4A:E3:7C:07:BD:2E:FC:82:30:66:E2:F9:6E:88:64:A7:E1:90:83:D8:63:5A:B5:EA
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Jul 26, 2026.
Never get surprised by asuna-h.co.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch asuna-h.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, 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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