51.161.37.58📋 Copy

# IP Intelligence Briefing: 51.161.37.58/32

## Executive Summary

IP address 51.161.37.58 is classified as Moderate Risk (risk score: 50) with a high-abuse neighborhood profile. The address is associated with OVH cloud infrastructure in Montreal, QC, CA, and resolves to ahrefs.net. The IP demonstrates elevated neighborhood risk with 73.83% abuse density and 189 threat-identified sibling IPs within the /24 subnet.

## Ownership and Infrastructure

• ASN: 16276 (OVH SAS)
• Organization: Dmytro, Ahrefs Pte Ltd
• Netname: OVH-CUST-281059684
• Registration: ARIN
• Infrastructure Type: Cloud Compute (OVH)
• Classification: Cloud hosting environment

## Geolocation and Network Position

• Location: Montreal, Quebec, Canada (CA)
• Region: QC
• BGP Prefix: 51.161.0.0/17
• Route Stability: Unstable (route changes observed in 30-day period)
• Operator Score: 0.2174 (Minimal)
• Geolocation Validation: GeoPlausible validation failed with 6,082 km distance discrepancy from Montreal coordinates

## DNS and Hostname Resolution

• PTR Hostname: proxy-ca005-san58.ahrefs.net
• Domain: ahrefs.net
• Forward Resolution: Confirmed (1 hostname)
• DNSSEC: Valid
• CAA Records: Present
• Email Authentication: SPF and DMARC records absent

## Service and Port State

• Open Ports: None detected
• HTTP Services: No active services
• TLS Certificate: Not present
• Classification: Firewalled / No Services

## Threat Indicators

• Abuse Confidence Score: Not available
• Blacklist Count: 0
• DNSBL Lists: 2 of 8 lists
• Known Attacker: False
• Spam Source: False
• Tor Exit Node: False
• Campaign Correlation: None identified
• Threat Persistence: 0 days
• Is Persistently Malicious: False

## Neighborhood Analysis (51.161.37.0/24)

• Subnet Classification: High Abuse
• Abuse Density: 73.83%
• Total Siblings: 256
• Active Siblings: 205
• Threat Siblings: 189
• Risk Distribution: 98 medium-risk, 2 low-risk neighbors (0 high-risk)
• Inherited Risk: 29

## Historical Observations

• Total Observations: 23 signals
• Most Recent: 2026-06-18
• Signal Types: Subnet abuse classification, operator routing, geolocation, DNS records
• Trend: Consistent high-abuse neighborhood classification maintained across observations

## Relationships

• Total Relationships: 62
• Primary Association: OVH-CUST-281059684 (same network)
• Network Type: Cloud compute customer subnet

## Recommended Actions

Based on the moderate risk profile and neighborhood context, the following firewall rules are recommended:

## Assessment

IP 51.161.37.58 operates within a high-abuse OVH cloud subnet in Montreal. While the specific IP shows no active open services and is not flagged as a known attacker, the neighborhood context (73.83% abuse density, 189 threat siblings) suggests elevated risk. The absence of open ports and services indicates the IP may be used for infrastructure hosting or as a jump host. The DNSBL listing on 2 of 8 lists indicates some prior reputation issues.

SOC Analyst Note: Monitor for any service activation on this IP. Consider blocking at perimeter if traffic patterns indicate malicious activity. The neighborhood risk warrants defensive positioning.

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