51.161.65.166📋 Copy

# IP Intelligence Briefing: 51.161.65.166/32

Classification: Moderate Risk (Risk Score: 40) | Reputation: Cloud Infrastructure Node

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## Executive Summary

IP 51.161.65.166 is an OVH CloudCompute node hosted under Ahrefs Pte Ltd infrastructure. The IP resolves to ahostname (proxy-ca011-san166.ahrefs.net) associated with the SEO analytics service ahrefs.net. Despite moderate overall risk, the IP resides within a subnet exhibiting high abuse density (0.6914), with 69% of active siblings classified as threats.

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## Technical Profile

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## Risk Assessment

Current Risk Indicators

• Risk Score: 40/100 (Moderate)
• Abuse Confidence: Not quantified
• Blacklist Status: 0 blacklist hits
• Campaign Association: None identified
• Threat Persistence: Single observation, not persistent

Control Plane Analysis

• BGP Prefix: 51.161.0.0/17
• Route Stability: Unstable (isRouteStable: false)
• DNSSEC: Valid
• DNSBL Listed: 1/8 lists
• Operator Score: 0.2174 (Minimal risk operator rating)

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## Neighborhood Analysis

Subnet: 51.161.65.0/24

Risk Distribution:

• High Risk: 0
• Medium Risk: 99
• Low Risk: 1

Assessment: The subnet demonstrates significant abuse concentration. While the target IP lacks direct threat indicators, its proximity to 177 threat-sibling IPs warrants contextual awareness.

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## Observation History

• Total Observations: 21
• Most Recent: 2026-06-15 14:13:19 UTC
• Threat Observation Count: 1
• Ownership Changes: 0
• Persistence Status: Not persistently malicious

Key Signals (Last Observation Window)

1. Ownership Signal (Confidence: 0.85) - Stable ownership

2. Subnet Abuse Density (Confidence: 0.75) - High abuse classification

3. BGP Routing (Confidence: 0.20) - Not classified as attacker/TOR/spam source

4. Operator Risk (Confidence: 0.60) - Minimal operator score

5. Overall Profile (Confidence: 0.22) - Insufficient data sufficiency

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## Geographic Validation

• Reported Location: Montreal, QC, CA
• Distance Discrepancy: 6,082 km from probe origin
• RTT Analysis: 27.0ms observed vs. 121.6ms minimum possible
• Status: GEOLOCATION VIOLATION DETECTED
• Probe Count: 5

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## Relationships & Network Graph

• Total Relationships: 39
• Primary Association: OVH-CUST-281059690 (Same Network)
• Network Classification: Multiple same-network relationships
• No External Associations: No certificates, organizations, or hostnames outside the OVH infrastructure

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## Recommended Actions

Immediate

1. Monitor Subnet Activity: 69% of neighbors show threat behavior. Apply monitoring filters to the 51.161.65.0/24 subnet.

2. Geographic Verification: Validate actual source location due to RTT/geolocation discrepancy.

3. Traffic Baseline: Establish baseline traffic patterns for this cloud node.

Firewall Rules

```bash

# Monitor traffic from this subnet (low-confidence threat)

iptables -A INPUT -s 51.161.65.0/24 -j LOG --log-prefix "OVH-AHREFS-TRAFFIC: "

```

Alerting

• Configure alerts for outbound connections from this IP to non-standard ports
• Monitor for DNS queries to ahrefs.net and related domains
• Alert on any blacklisting of the IP or subnet

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## Final Assessment

IP 51.161.65.166 presents a moderate risk profile as a legitimate cloud infrastructure node with no direct threat indicators. However, the high-abuse neighborhood (177 threat siblings in the same /24) necessitates contextual monitoring. The geolocation violation requires verification before definitive location-based decisions. No immediate blocking is recommended, but continued observation and subnet-level awareness are advised.

Threat Level: LOW (with HIGH neighborhood risk)

Action: Monitor, do not block

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