SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for js-sj.cn
Valid- Issued by (CA)
- Google Trust Services
- Subject
- js-sj.cn
- Valid from
- Aug 26, 2026
- Valid until
- Nov 24, 2026 (49 days remaining)
- Public key
- EC 256-bit
- Serial
- C1D05D9A28C02D25138FED6663879361
- SHA-256 fingerprint
- 58:8D:4A:77:A8:4D:BC:D1:E7:EE:1B:A0:19:F1:68:1C:4D:BB:54:A0:28:4E:D3:76:45:BD:05:64:66:A8:F2:3F
- Chain
- WE1 → GTS Root R4
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 Oct 4, 2026.
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This is today's certificate. Turn on monitoring and we'll watch js-sj.cn 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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