SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sw-tokyo.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for sw-tokyo.co.jp
Valid- Issued by (CA)
- ZeroSSL GmbH
- Subject
- sw-tokyo.co.jp
- Valid from
- Jul 4, 2026
- Valid until
- Oct 2, 2026 (52 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 238555AA711C578958702A57A67E147E
- SHA-256 fingerprint
- 89:ED:E1:41:C7:A5:30:5F:65:C6:49:40:F8:01:E3:4A:4F:79:40:2E:42:8E:3A:50:46:58:CA:9C:1E:A9:B4:88
- Chain
- ZeroSSL RSA DV SSL CA 2 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
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 Aug 7, 2026.
Never get surprised by sw-tokyo.co.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sw-tokyo.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.
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