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 u-edu.cn
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- www.u-edu.cn
- Valid from
- Oct 19, 2026
- Valid until
- Jan 17, 2027 (66 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06D6420BBBDE35381C19736F0E5CF025F30D
- SHA-256 fingerprint
- CE:A6:44:80:B8:CC:6F:0C:B8:F9:7A:57:F0:29:BA:06:C0:31:8B:45:F9:C5:8B:8C:5B:87:A6:AB:67:B0:12:A9
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by u-edu.cn's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch u-edu.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, CNAME, TXT 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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