51.103.131.31📋 Copy

INTELLIGENCE BRIEFING: 51.103.131.31/32

Classification: High Risk – Immediate Monitoring Recommended

Summary

IP 51.103.131.31 is a Microsoft Azure cloud-hosted infrastructure endpoint located in Zurich, Switzerland (ASN 8075, BGP prefix 51.103.0.0/16). The IP carries a risk score of 80/100, classified as High Risk, and appears on 4 of 8 monitored DNSBL lists with maximum severity ratings. No open ports or active services were detected, though the IP is associated with hosting infrastructure.

Technical Profile

• Risk Score: 80/100 (High Risk)
• Operator Score: 0.1304 (Minimal)
• Infrastructure: Microsoft Azure, CloudCompute, Hosting
• Geolocation: Zurich, Switzerland (CH), Europe/Zurich timezone
• DNSBL Listings: 4 of 8 total lists
• Network Classification: Cloud-hosted, no bogon status

Threat Indicators

• Not identified as Tor exit node, known attacker, or spam source
• No active threat indicators or known campaign associations detected
• No certificate matches or banner correlations
• Behavioral analysis shows no enumeration strikes, WAF violations, or honeypot hits

Network Context

• No neighboring IPs identified in 51.103.131.0/24 subnet
• Abuse density for subnet: 0
• No threat siblings or correlated IPs in relationship graph
• Control plane shows route changes within 30-day window (0 changes)

Observation History

Eight signal observations recorded with recent activity confirming Microsoft Azure provider assignment and Zurich geolocation. DNSBL listing activity shows 4 high-severity listings with operator score consistently at 0.1304 (Minimal).

Recommended Actions

1. Firewall/Blocking: Implement DROP rule for 51.103.131.31/32 across iptables, nftables, nginx, pfSense, Cloudflare WAF, and AWS WAF

2. Monitoring: Increase logging verbosity and review recent activity from this IP

3. Classification: Flag as Critical severity due to elevated risk score (80/100)

Assessment

Despite the high-risk classification and DNSBL presence, the IP shows no active service exposure and no behavioral indicators of malicious activity. The risk score reflects reputation data and blacklist associations rather than confirmed active exploitation. Recommended action is defensive blocking with continued monitoring for any changes in threat posture or activity patterns.

This summary was generated by AI and may contain inaccuracies. Verify critical details independently.