51.138.158.71📋 Copy

IP INTELLIGENCE BRIEFING: 51.138.158.71/32

Classification: LOW RISK / LEGITIMATE CLOUD INFRASTRUCTURE

Report Date: June 2026

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EXECUTIVE SUMMARY

Target IP 51.138.158.71 is a Microsoft Azure cloud compute instance with a risk score of 25 (Low Risk). No active threat indicators, malware campaigns, or known attacker associations detected. The IP operates within the 51.138.0.0/16 CIDR block and exhibits standard cloud infrastructure characteristics. No immediate blocking recommendations required.

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OWNERSHIP & NETWORK IDENTIFICATION

• ASN: 8075 (Microsoft Azure)
• Organization: Divya Quamara
• Netname: cloud
• CIDR Block: 51.138.0.0/16
• RIR: ARIN
• Geolocation: GB (Great Britain) / Marseille region
• Network Role: Single-Service Host / Cloud Compute

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RISK ASSESSMENT

Overall Risk Score: 25 (Low Risk)

Threat Indicators:

• Not a Tor exit node
• Not a known attacker
• Not a spam source
• No active threat feeds
• No known campaign associations

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INFRASTRUCTURE PROFILE

Services & Ports:

• Port 80/TCP (HTTP) - Open
• Server Banner: nginx/1.28.1
• TLS Certificate: None detected
• Email Auth Records: SPF/DMARC not configured

DNS Resolution:

• PTR Hostnames: None
• Forward Resolution: Not confirmed
• Hosted Domains: 0

Control Plane:

• Route Stability: Unstable
• DNSSEC: Valid
• Operator Score: 0.1304 (Minimal)
• RPKI State: Not available
• IRR Consistency: Not available

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NEIGHBORHOOD ANALYSIS

Subnet: 51.138.158.71/24

• Abuse Density: 1 (Low)
• Classification: Mostly Clean
• Inherited Risk: 2
• Active Siblings: 1
• Threat Siblings: 1

The IP resides in a subnet with minimal abuse activity. No significant clustering of malicious infrastructure observed in the immediate neighborhood.

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OBSERVATION HISTORY

Total Observations: 20 signals tracked

Recent Activity Timeline:

• 2026-06-21: Cloud infrastructure confirmation (Microsoft Azure)
• 2026-06-16: Connection failure attempts (HTTP scheme)
• 2026-06-11: Subnet classification assessment (mostly_clean)

Persistence Indicators:

• Threat Observation Count: 1
• Persistent Malicious Activity: False
• Ownership Changes: 0

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RELATIONSHIP GRAPH

Detected Relationships: 13 "Same Network" associations

• All relationships map to "cloud" network classification
• No cross-organization or cross-subnet linkages identified
• No certificate-based relationships detected

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SECURITY ACTIONS & RECOMMENDATIONS

Current Risk Profile: Low

Recommended Action: No action required

Firewall Rules: None generated (risk score below threshold)

Analysis: The IP exhibits standard Microsoft Azure cloud infrastructure behavior with no malicious indicators. The single DNSBL listing and historical connection failure attempts are consistent with cloud service operations rather than malicious activity. No firewall blocking or rate-limiting recommended at this time.

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SOC OPERATOR NOTES

1. Traffic Pattern: Expect HTTP traffic on port 80 with nginx server responses

2. Geographic Consistency: IP resolves to GB region, consistent with Microsoft Azure European infrastructure

3. Behavioral Baseline: Standard cloud compute behavior with no anomalous patterns

4. Monitoring Level: Routine monitoring sufficient; no elevated threat monitoring required

Final Assessment: This IP represents legitimate Microsoft Azure cloud infrastructure with no indicators of compromise or malicious activity. Continue standard monitoring procedures.

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