SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
u-go.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for u-go.co.jp
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- www.u-go.co.jp
- Valid from
- Jul 3, 2026
- Valid until
- Oct 1, 2026 (51 days remaining)
- Public key
- EC 256-bit
- Serial
- 0588D28C807F82D587B0D307687D483831DA
- SHA-256 fingerprint
- 0C:FE:83:4C:36:0C:A5:E7:84:CD:A3:07:31:83:9F:07:89:09:C6:0D:B8:37:6B:31:36:16:27:90:D3:7E:15:19
- 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.
Never get surprised by u-go.co.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch u-go.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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