51.161.37.191📋 Copy

# IP INTELLIGENCE BRIEFING

Target: 51.161.37.191/32

Classification: Moderate Risk / Cloud Infrastructure

## Executive Summary

IP 51.161.37.191 is an OVH cloud infrastructure endpoint operating within the 51.161.37.0/24 subnet. The IP resolves to proxy-ca005-san191.ahrefs.net and is associated with Ahrefs Pte Ltd (ASN 16276). The subnet demonstrates high abuse density (0.6602) with 169 threat-adjacent siblings, though the target IP itself shows no active service exposure.

## Infrastructure Profile

• Provider: OVH Cloud (OVH-CUST-281059684)
• Organization: Dmytro, Ahrefs Pte Ltd
• Geolocation: Singapore (Geo consensus: true)
• Infrastructure Type: CloudCompute / Hosting
• DNS Resolution: proxy-ca005-san191.ahrefs.net (ahrefs.net)
• Services: No open ports detected; firewall configuration active

## Risk Assessment

• Risk Score: 40 (Moderate Risk)
• Abuse Confidence: DNSBL listed on 1 of 8 threat feeds
• Threat Indicators: No known attacker flags, not Tor exit, no spam source designation
• Operator Score: 0.2174 (Minimal operator risk)

## Neighborhood Analysis

The 51.161.37.0/24 subnet presents elevated risk characteristics:

• Abuse Density: 0.6602 (High Abuse Classification)
• Inherited Risk: 26
• Sibling Distribution: 197 active IPs, 169 threat-adjacent
• Neighbor Risk Profile: 99 medium-risk neighbors, 1 low-risk

## Historical Observations

Seventeen signal observations recorded since 2026-06-14. The subnet has been consistently monitored with stable classification patterns. No significant risk trajectory shifts detected.

## Security Recommendations

1. Traffic Monitoring: Flag traffic from 51.161.37.0/24 for enhanced logging due to high-abuse subnet classification

2. DNSBL Verification: Investigate the single DNSBL listing for potential false positives (associated with Ahrefs infrastructure)

3. Service Exposure: Monitor for any service emergence on this previously unresponsive endpoint

4. Correlation Analysis: Cross-reference with known Ahrefs proxy patterns to distinguish legitimate traffic from abuse

## Threat Intelligence Narrative

The IP 51.161.37.191 operates within a high-abuse-density OVH hosting subnet. While the endpoint itself shows no active service exposure and is not flagged as a known malicious actor, the subnet context (169 threat siblings) warrants elevated monitoring. The Ahrefs association suggests legitimate SEO tool infrastructure, but the proxy hostname and DNSBL listing require validation against known false-positive patterns. SOC teams should apply monitoring rules at the /24 level while maintaining endpoint-specific scrutiny for anomalous behavior.

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