SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
gtnet-gunma.jp
SSL/TLS Certificate
SSL/TLS Certificate for gtnet-gunma.jp
Hostname mismatch- Issued by (CA)
- GlobalSign nv-sa
- Subject
- www.gtnet.co.jp
- Valid from
- Dec 15, 2025
- Valid until
- Jan 16, 2027 (169 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 63FDB49896A6FE79E3CBDFC9
- SHA-256 fingerprint
- D4:60:E3:2E:D2:C3:D9:68:67:F8:DD:DB:69:8F:9C:9A:E3:75:34:80:24:95:D3:E2:8F:29:57:6B:37:E3:07:88
- Chain
- GlobalSign RSA OV SSL CA 2018 → GlobalSign
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by gtnet-gunma.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch gtnet-gunma.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.
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