SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

SSL/TLS Certificate for www11111uj.sakura.ne.jp

Hostname mismatch
Issued by (CA)
Nijimo, Inc.
Subject
www.k-uip.co.jp
Valid from
Jul 8, 2026
Valid until
Jan 22, 2027 (173 days remaining)
Public key
RSA 2048-bit
Serial
708CF15E7A64AEB2D5F7C951605E5FCB
SHA-256 fingerprint
7B:EA:38:10:51:38:7B:1A:D7:9A:AC:54:E4:06:F6:98:0E:32:20:C0:5C:00:3F:F9:F4:38:22:E1:E6:84:83:A3
Chain
FujiSSL RSA Domain Validation Secure Server CA 2 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Subject Alternative Names (2)
k-uip.co.jp, www.k-uip.co.jp

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

Never get surprised by www11111uj.sakura.ne.jp's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch www11111uj.sakura.ne.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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.