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 yokotakogyo.co.jp

Hostname mismatch
Issued by (CA)
Cybertrust Japan Co., Ltd.
Subject
www.yokotakogyo.co.jp
Valid from
Jan 8, 2026
Valid until
Jan 31, 2027 (172 days remaining)
Public key
RSA 2048-bit
Serial
70939B0BAE486E7BF68C62F6F767C544BB06310D
SHA-256 fingerprint
7B:E2:C6:4F:02:26:C5:15:C7:04:AC:7B:58:9B:BE:35:FE:71:F7:63:CC:AF:19:01:53:61:B8:59:4E:B3:00:B9
Chain
Cybertrust Japan SureServer CA G4
Subject Alternative Names (1)
www.yokotakogyo.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 yokotakogyo.co.jp's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch yokotakogyo.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.

Monitor this certificate free

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