📄WHOIS
互联网域名系统北京市工程研究中心有限公司
🌐DNS
1 A · 4 MX · 4 NS · 1 SOA · 4 TXT
🔒SSL/TLS
DigiCert, Inc. · TLSv1.3 · expires in 144d · 2 SANs
✉️Email Auth
SPF ✓ · DKIM ✗ · DMARC ✓ (p=quarantine)
💻Tech Stack
Host: CHINANET BACKBONE · Email: Self-hosted
📡HTTP
2 redirect → 200 · HSTS ✗ · CSP ✓ · X-Frame ✓ · Nosniff ✗
🛡️Security
C (150/215) · 1 critical · 2 high
📈Deliverability
A+ (88/90) · 4 MX · 4 IPs · 2 issue(s)
🔍Subdomains
8 found · 99 answered (13 timed out) — autodiscover, cdn, en, mail, mobile, smtp +2 more
📚Web Archive
first snapshot 1998-12-12 · 27y archived