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 a-u.cn
Hostname mismatch- Issued by (CA)
- ZeroSSL GmbH
- Subject
- aijiayuan.cn
- Valid from
- Jul 10, 2026
- Valid until
- Oct 8, 2026 (28 days remaining)
- Public key
- EC 256-bit
- Serial
- 4354A89067F649F3732A81CDF14FA7EF
- SHA-256 fingerprint
- 7F:F3:BD:09:C9:CC:27:66:63:4D:08:DD:54:2E:85:A6:61:9E:B2:C3:BF:59:32:C2:31:02:A1:1F:0A:D6:4A:AD
- Chain
- ZeroSSL ECC DV SSL CA 2 → Sectigo Public Server Authentication Root E46 → USERTrust ECC Certification Authority
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by a-u.cn's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch a-u.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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