54.39.0.187📋 Copy

## THREAT INTELLIGENCE BRIEFING

Target: 54.39.0.187/32

Date: [Current Date]

Classification: Moderate Risk - Cloud Infrastructure Asset

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EXECUTIVE SUMMARY

IP 54.39.0.187 is a cloud-hosted infrastructure address within the OVH provider network (ASN 16276). The IP resolves to the Ahrefs.net domain with hostname proxy-ca004-san187.ahrefs.net, indicating legitimate hosting use. However, the subnet (54.39.0.0/24) exhibits elevated abuse density (0.6471) with 165 threat-sibling IPs identified, warranting defensive posture awareness. Risk score: 40/100.

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OWNERSHIP & INFRASTRUCTURE

• Organization: Dmytro, Ahrefs Pte Ltd
• Provider: OVH CloudCompute infrastructure
• Netname: OVH-CUST-281059683
• Location: Canada, QC, Beauharnois (3000km accuracy radius)
• RIR: ARIN
• Infrastructure Type: Cloud hosting (not CDN, VPN, or proxy)

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NETWORK CLASSIFICATION

• Status: Firewalled / No Services (no open ports detected)
• DNS Classification: CloudCompute hosting
• Service Purpose: Hosted proxy endpoint
• DNSBL Status: Listed on 1 of 8 DNS blacklists (12.5% listing rate)
• Route Stability: False (non-stable routing)
• Operator Score: 0.2174 (Minimal)

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THREAT INDICATORS

• Known Attacker: No
• Spam Source: No
• Tor Exit Node: No
• Campaigns: None detected
• Threat Persistence: 0 days observed
• Abuse Confidence: Not flagged as known malicious actor

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SUBNET ANALYSIS (54.39.0.0/24)

• Total Siblings: 255 IPs
• Active Siblings: 163 (64%)
• Threat Siblings: 165 (65% of active)
• Abuse Density: 0.6471 (High)
• Inherited Risk: 25
• Neighbor Risk Distribution: 98 medium, 2 low risk (0 high)

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OBSERVATION HISTORY

• Total Observations: 21 signals
• Recent Activity: June 2026
• Signal Types: Routing, reputation, geolocation, subnet analysis
• Risk Trend: Consistent moderate risk across observation period
• Geolocation Consistency: Confirmed CA across multiple probes

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RELATIONSHIP GRAPH

• Total Relationships: 54
• Primary Link: Same Network (OVH-CUST-281059683)
• Network Context: Part of larger OVH customer infrastructure
• Associated Entities: Multiple same-network relationships indicate shared infrastructure

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RECOMMENDED ACTIONS

SOC/DEFENSIVE RECOMMENDATIONS:

1. Block at Perimeter: Consider blocking inbound traffic to this IP if not required for business operations (Ahrefs.net proxy endpoint).

2. Monitor Subnet Activity: Given 65% threat sibling rate, monitor 54.39.0.0/24 for lateral threat indicators.

3. DNS Filtering: Add DNS blacklist entry due to 1 DNSBL listing.

4. Traffic Analysis: Review logs for connections to proxy-ca004-san187.ahrefs.net to confirm legitimate use or abuse.

5. FW Rules: Implement rate limiting if traffic is allowed (cloud hosting asset).

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RISK ASSESSMENT

Overall Risk: MODERATE (40/100)

This IP represents legitimate cloud hosting infrastructure but operates within a high-abuse subnet. The lack of open services reduces direct exploitation risk, but the subnet environment requires defensive monitoring. No active malicious campaigns detected.

Priority: Low-Medium

Action: Monitor and log; consider blocking if not required for business operations.

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