51.161.65.1📋 Copy

# IP INTELLIGENCE BRIEFING: 51.161.65.1/32

Classification: Moderate Risk - Cloud Infrastructure

Date: Current Intelligence Cycle

Jurisdiction: Canada (Montreal, QC)

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## EXECUTIVE SUMMARY

Target IP 51.161.65.1/32 is a cloud-hosted endpoint operating within OVH's infrastructure under the OVH-CUST-281059690 allocation. The IP resolves to proxy-ca011-san1.ahrefs.net within the ahrefs.net domain namespace. Risk scoring indicates moderate threat profile (40/100) with elevated neighborhood-level abuse density requiring contextual assessment.

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## OWNERSHIP & INFRASTRUCTURE

Network Classification: The IP operates as cloud infrastructure with hosting services enabled. No CDN, VPN, or proxy services detected at the endpoint level. The IP is firewalled with no open ports observed.

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## THREAT INDICATORS

Risk Metrics:

• Overall Risk Score: 40/100 (Moderate)
• DNSBL Listings: 1 of 8 total lists
• Abuse Confidence Score: Not available
• Is Known Attacker: No
• Is Tor Exit Node: No

DNS Analysis:

• PTR Record: proxy-ca011-san1.ahrefs.net
• Forward Resolution: Confirmed
• Hosted Domains: 0
• Email Authentication: SPF/DMARC records absent
• DNSSEC: Validated

Campaign Correlation: No known threat campaigns correlated. Zero certificate matches.

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## NEIGHBORHOOD CONTEXT

The /24 subnet (51.161.65.0/24) exhibits elevated abuse characteristics:

Risk Assessment: The subnet demonstrates significant abuse concentration with 152 threat-associated IPs out of 256 total addresses. This contextualizes the target IP within a higher-risk operational environment, suggesting the broader network allocation may be utilized for hosting services with varying security postures.

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## OBSERVATION HISTORY

Signal Count: 24 observations recorded

Temporal Persistence: 0 threat persistence days

Status: Not persistently malicious

Recent Activity:

• 2026-06-23: DNS resolution to ahrefs.net observed (confidence: 0.80)
• 2026-06-19: Operator scoring at "Minimal" level (0.2174)
• 2026-06-18: Comprehensive profile assessment conducted

The IP exhibits low operational persistence with no sustained malicious behavior patterns observed across the observation window.

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## RELATIONSHIP GRAPH

Connected Entities: 58 relationships identified

• Primary correlation: Same Network (OVH-CUST-281059690)
• No external organization associations
• Limited to internal network infrastructure

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## RECOMMENDED ACTIONS

Detection & Monitoring:

1. Blocklist Consideration: Due to DNSBL listing and elevated neighborhood abuse density, evaluate for temporary blocklisting pending further intelligence

2. Traffic Monitoring: Monitor outbound connections from proxy-ca011-san1.ahrefs.net for anomalous patterns

3. Subnet-Level Awareness: Consider subnet-wide filtering policies for 51.161.65.0/24 given 59% abuse density

Firewall Rules:

```

# Block suspicious traffic from high-abuse subnet

iptables -A INPUT -s 51.161.65.0/24 -j DROP

```

IOC Extraction:

• Domain: proxy-ca011-san1.ahrefs.net
• ASN: 16276
• Risk Threshold: 40/100

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## INTELLIGENCE ASSESSMENT

The target IP represents cloud infrastructure associated with Ahrefs operations within an OVH hosting environment. While the endpoint itself shows minimal direct threat indicators, the high-abuse density of the parent subnet warrants defensive caution. The combination of hosting services, absent email authentication, and neighborhood-level abuse suggests potential for service abuse or compromised infrastructure within the broader network allocation.

Recommendation: Maintain monitoring posture with subnet-aware filtering. The IP's moderate risk profile combined with neighborhood context suggests defensive vigilance rather than immediate blocking.

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Generated by: IPDebrief Intelligence Platform

Data Sources: IP reputation feeds, DNS resolution, ASN routing, threat intelligence feeds

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