SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
k-swimmy.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for k-swimmy.co.jp
Valid- Issued by (CA)
- GlobalSign nv-sa
- Subject
- www.k-swimmy.co.jp
- Valid from
- Mar 15, 2026
- Valid until
- Sep 30, 2026 (61 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 017B35073018D685D4D389E2830F0601
- SHA-256 fingerprint
- BD:50:06:F4:DC:EC:DE:AB:B2:51:7C:3B:35:EE:30:1C:A8:41:F0:B4:78:0A:FC:17:4E:45:8D:7B:5D:E7:90:1B
- Chain
- GlobalSign Atlas R3 AlphaSSL CA 2026 Q1 → GlobalSign
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by k-swimmy.co.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch k-swimmy.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.