🌐DNS
1 A · 2 MX · 4 NS · 1 SOA · 2 TXT
🔒SSL/TLS
invalid — TrustAsia Technologies, Inc. · TLSv1.2 · expires in 275d · 1 SANs
✉️Email Auth
SPF ✓ · DKIM ✓ · DMARC ✓ (p=quarantine)
💻Tech Stack
Host: China Education and Research Network Center · Email: Self-hosted · nginx
📡HTTP
1 redirect → 200 · HSTS ✓ · CSP ✗ · X-Frame ✗ · Nosniff ✗
🛡️Security
D (120/225) · 3 critical · 3 high
📈Deliverability
C (68/100) · 2 MX · 3 IPs · 4 issue(s)
🔍Subdomains
6 found · 113 answered — m, mail, mobile, uk, us, www