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 so-kan.co.jp

Valid
Issued by (CA)
GlobalSign nv-sa
Subject
www.so-kan.co.jp
Valid from
Nov 22, 2025
Valid until
Dec 24, 2026 (43 days remaining)
Public key
RSA 2048-bit
Serial
65F134DE3D61DFE201628981
SHA-256 fingerprint
AD:05:D6:DA:23:EE:5B:ED:A3:53:B7:0A:59:24:0C:51:48:32:92:D8:F4:A5:2F:76:60:85:74:57:1B:9A:EE:D5
Chain
GlobalSign GCC R6 AlphaSSL CA 2025 → GlobalSign
Subject Alternative Names (2)
so-kan.co.jp, www.so-kan.co.jp

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 Nov 6, 2026.

Never get surprised by so-kan.co.jp's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch so-kan.co.jp continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

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, CNAME, TXT 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.