SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
hs-planning.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for hs-planning.co.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- hs-planning.co.jp
- Valid from
- Jun 10, 2026
- Valid until
- Sep 8, 2026 (47 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06DB113EDD4A9F2EED34E3C4620047E9FA2E
- SHA-256 fingerprint
- D4:4F:4F:97:BE:F3:0F:6E:FA:CD:6F:F7:5B:F5:50:DB:E8:0F:CA:2E:7C:15:D6:95:B3:65:DA:CD:00:6B:94:8D
- 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 hs-planning.co.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch hs-planning.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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