SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
yokoyama-sk.com
SSL/TLS Certificate
SSL/TLS Certificate for yokoyama-sk.com
Valid- Issued by (CA)
- GlobalSign nv-sa
- Subject
- www.yokoyama-sk.com
- Valid from
- Jan 7, 2026
- Valid until
- Jan 7, 2027 (146 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 013F7764AB3CA105707DF3F91A1DB030
- SHA-256 fingerprint
- 4A:B3:B5:8E:D0:03:80:18:FB:8D:55:D7:AF:27:65:BF:BC:F2:00:1E:C9:E8:80:A8:B9:06:21:03:AA:89:47:A8
- Chain
- GlobalSign Atlas R3 AlphaSSL CA 2025 Q4 → GlobalSign
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by yokoyama-sk.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch yokoyama-sk.com 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.