51.161.37.1📋 Copy

# IP Intelligence Briefing: 51.161.37.1/32

Classification: Moderate Risk - Cloud Hosting Infrastructure

Date: 2026-06-21

Analyst: IPDebrief SOC

## Executive Summary

IP 51.161.37.1 is a cloud-computing address hosted on OVH infrastructure in Montreal, Quebec, Canada. The IP resolves to Ahrefs net infrastructure and presents moderate risk (Score: 40) with no direct threat indicators. However, the /24 subnet exhibits high abuse density (0.7773), warranting neighborhood-level awareness.

## Infrastructure Profile

• Owner: OVH (ASN 16276)
• Organization: Dmytro, Ahrefs Pte Ltd
• Network: OVH-CUST-281059684 / 51.161.37.0/24
• Geolocation: Montreal, QC, CA (3000km accuracy radius)
• Infrastructure: CloudCompute / Hosting (Not CDN, VPN, or Tor)
• Services: No open ports detected (Firewalled / No Services)
• DNS PTR: proxy-ca005-san1.ahrefs.net
• Forward Resolution: proxy-ca005-san1.ahrefs.net (1 record)

## Threat Assessment

• Risk Score: 40 (Moderate)
• Blacklist Status: 0 direct blacklists
• Threat Indicators: None observed
• Known Campaigns: None
• Tor Exit Node: No
• Known Attacker: No
• Spam Source: No
• DNSBL Listed: 1 of 8 lists

## Neighborhood Intelligence

The /24 subnet 51.161.37.0/24 demonstrates elevated abuse characteristics:

• Abuse Density: 0.7773 (High)
• Classification: high_abuse
• Total Siblings: 256
• Active Siblings: 203
• Threat Siblings: 199
• Inherited Risk: 31

Approximately 78% of active IPs in the subnet are associated with threat activity. This indicates a shared hosting environment where abuse may originate from neighboring addresses.

## Temporal Analysis

• Observation Count: 24 historical signals
• Ownership Changes: 0
• Threat Persistence: 0 days
• Is Persistently Malicious: No
• Route Stability: Stable (Route changes: 0 in 30d)
• DNSSEC: Valid
• Recent Activity: Infrastructure classification consistent across observations (June 2026)

## Recommended Actions

Given the moderate risk classification and high-abuse neighborhood:

1. Monitor Closely: Track for outbound connection anomalies

2. Geofencing: Consider policy review if traffic originates from CA/Montreal

3. DNS Monitoring: Alert on new forward resolutions for proxy-ca005-san1.ahrefs.net

4. Port Scan Correlation: Monitor for new service openings on this subnet

5. Inherited Risk: Apply elevated scrutiny to 51.161.37.0/24 traffic due to 199 threat siblings

## Conclusion

This IP represents legitimate cloud hosting infrastructure with no direct threat indicators. However, the high-abuse neighborhood context requires awareness that adjacent IPs in the /24 subnet may be malicious. Standard monitoring and logging recommendations apply.

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