51.161.65.61📋 Copy

## IP INTELLIGENCE BRIEFING

Target IP: 51.161.65.61/32

Classification: Moderate Risk / High Abuse Neighborhood

Date: 2026-06-28

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EXECUTIVE SUMMARY

IP 51.161.65.61 is a cloud-hosted infrastructure address assigned to OVH under the netname OVH-CUST-281059690, registered to organization Dmytro, Ahrefs Pte Ltd. The IP presents moderate individual risk (40/100) but operates within a subnet exhibiting elevated abuse density (0.6914), with 177 of 256 total siblings classified as threats. No open services were detected; the address is configured as firewalled with no active HTTP/TLS services.

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OWNERSHIP & INFRASTRUCTURE

Network Role: Cloud-hosted infrastructure with firewalled configuration. No open ports detected.

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THREAT INDICATORS

• Risk Score: 40 (Moderate Risk)
• Blacklist Count: 0
• DNSBL Listed: 1 of 8 lists checked
• Abuse Confidence Score: Not calculated
• Known Campaigns: None identified
• Is Tor Exit/VPN/Proxy: No

Threat Feed Analysis: No indicators in threat feeds, Pulsedive risk not applicable.

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NETWORK ACTIVITY PROFILE

DNS Configuration:

• PTR Record: proxy-ca011-san61.ahrefs.net
• Forward Resolution: Confirmed (1 hostname)
• Email Authentication: SPF/DMARC not configured

Service Fingerprint:

• Open Ports: None detected
• HTTP/TLS: No active services
• Server Banner: None
• Status Code: Not detected

Control Plane:

• Route Stability: False
• BGP Prefix: 51.161.0.0/17
• RPKI State: Not validated
• Delegation Age: Unknown

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GEOGRAPHIC VALIDATION

Validation Status: INVALID

• Reported Location: Canada (Montreal, QC)
• Observed RTT: 27ms
• Minimum Expected RTT: 121.6ms (for 6082km distance)
• Conclusion: Geolocation data inconsistent with network latency measurements.

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OBSERVATION HISTORY (22 Signals)

Recent activity indicates stable provider assignment to OVH with confidence 0.85. Geolocation signals (Canada) show low confidence (0.18) across multiple observations. Operator score remains minimal (0.2174). No persistent malicious behavior detected in historical signals.

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NEIGHBORHOOD ANALYSIS (51.161.65.0/24)

Risk Distribution Across Subnet:

• High Risk: 0
• Medium Risk: 100
• Low Risk: 0

Assessment: The /24 subnet demonstrates concentrated threat activity with 177 threat siblings. Neighbor analysis shows uniform moderate-risk profiles (risk score 40, authority score 50) across sampled addresses. This indicates the subnet may be associated with coordinated hosting or abuse operations.

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RELATIONSHIP GRAPH

Total relationships: 47

• Same Network: Multiple relationships to OVH-CUST-281059690
• Network ownership consistently attributed to the same netname

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RECOMMENDATIONS FOR SOC ANALYSTS

1. MONITOR CLOSELY: The high abuse density (0.6914) and elevated threat sibling count (177) warrant enhanced monitoring. Treat this subnet as potentially compromised infrastructure.

2. BLOCK IF SUSPICIOUS: Consider blocking outbound traffic to 51.161.65.0/24 if:

- Inbound connections from this subnet are observed

- Outbound connections to this subnet contain suspicious payloads

- The subnet is not part of your legitimate cloud provider roster

3. INVESTIGATE ORIGIN: The RTT validation failure suggests potential spoofing or misreported geolocation. Correlate with known Ahrefs infrastructure to determine legitimacy.

4. NEIGHBOR CORRELATION: Analyze related IPs in the 51.161.65.0/24 range for coordinated behavior patterns. 207 active siblings suggest a concentrated operational environment.

5. EMAIL AUTHENTICATION: No SPF/DMARC records present. If this IP is used for email transmission, it lacks standard email authentication mechanisms.

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END OF BRIEFING

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