SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
about-s.jp
SSL/TLS Certificate
SSL/TLS Certificate for about-s.jp
Valid- Issued by (CA)
- ZeroSSL GmbH
- Subject
- *.about-s.jp
- Valid from
- Jul 29, 2026
- Valid until
- Oct 27, 2026 (80 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 365E02F944284D3D13BA0F1DE9087740
- SHA-256 fingerprint
- 94:2D:7D:20:83:D8:F4:FF:6E:57:F5:5E:B3:7F:9E:E5:9B:52:06:86:44:6C:18:41:42:01:94:C4:9B:01:CB:8A
- Chain
- ZeroSSL RSA DV SSL CA 2 → Sectigo Public Server Authentication Root R46
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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This is today's certificate. Turn on monitoring and we'll watch about-s.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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