SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sp-one.jp
SSL/TLS Certificate
SSL/TLS Certificate for sp-one.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sp-one.jp
- Valid from
- Jul 7, 2026
- Valid until
- Oct 5, 2026 (63 days remaining)
- Public key
- EC 256-bit
- Serial
- 055A3A1640621A24A88ACE472324568BD4CC
- SHA-256 fingerprint
- 0D:64:1D:51:3D:71:53:C1:BA:59:2E:DB:BD:21:7F:A4:42:6A:04:25:33:51:74:49:BA:8D:47:18:AD:51:18:ED
- Chain
- YE1 → Root YE → ISRG Root X2 → 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 sp-one.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sp-one.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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