SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sama-sama.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for sama-sama.co.jp
Valid- Issued by (CA)
- GlobalSign nv-sa
- Subject
- sama-sama.co.jp
- Valid from
- Jan 16, 2026
- Valid until
- Feb 17, 2027 (204 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 5F5DEDAAB85E112192280203
- SHA-256 fingerprint
- 39:77:78:06:6B:B5:F3:88:28:22:C5:4E:BB:65:FA:3A:70:2F:C6:EB:77:01:CC:F0:4F:34:90:A0:AA:A7:F2:93
- Chain
- GlobalSign GCC R3 DV TLS CA 2020 → GlobalSign
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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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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