3.cnSSL Check Results
327
days until expiration
TLSv1.3
TLS_AES_256_GCM_SHA384
GlobalSign nv-sa
2048 bits
68E8E513F7B22D6F3F3A8CDE
CB:A0:6B:A5:E5:7D:B8:74:B0:2F:1F:91:9A:4F:5C:46:6E:6A:88:BE
B9:79:72:1F:72:35:7D:05:4C:6F:23:C5:90:24:6B:54:C5:73:B7:08:49:9D:FE:AB:F2:97:70:1B:AD:04:DB:11
Security Score
Excellent security configuration
GlobalSign RSA OV SSL CA 2018
327 days
Nov 18, 2025
Dec 20, 2026
Security Analysis
Secure
Secure
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Certificate History
No historical data found
SSL Security Best Practices
Automate Renewals
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Use Strong Protocols
Always prefer TLS 1.3 or 1.2. Disable older, vulnerable protocols like SSL 3.0, TLS 1.0, and TLS 1.1 on your server.
Monitor Transparency
Keep an eye on Certificate Transparency (CT) logs to ensure no unauthorized certificates are issued for your domain.
Frequently Asked Questions
Everything you need to know about 3.cn's security status.
Q:When does 3.cn's SSL certificate expire?
3.cn's certificate expires on December 20, 2026, which is in 327 days.
Q:Who issued the certificate for 3.cn?
It was issued by GlobalSign nv-sa. This issuer is recognized by all major browsers.
Q:Is the connection to 3.cn safe?
Yes, the certificate is valid, meaning communication with 3.cn is encrypted and secure.
Q:Can I monitor this domain for free?
Yes! You can register at GuardSSL to get automatic alerts before 3.cn's certificate expires, preventing any downtime.