51.161.37.3📋 Copy

## INTELLIGENCE BRIEFING: 51.161.37.3/32

Classification: Moderate Risk

Date: Current

Analyst: IPDebrief Intelligence System

---

**Executive Summary**

IP 51.161.37.3 is a cloud compute resource registered to Dmytro, Ahrefs Pte Ltd under OVH network infrastructure (ASN: 16276). The address is hosted within Montreal, QC, Canada but exhibits significant geolocation implausibility. Current risk assessment scores 40 (Moderate Risk) with no active threat indicators, though the /24 subnet demonstrates elevated abuse density characteristics.

**Ownership & Infrastructure**

• Organization: Dmytro, Ahrefs Pte Ltd
• Network: OVH-CUST-281059684
• ASN: 16276 (OVH)
• CIDR Block: 51.161.37.0/24
• Infrastructure Type: CloudCompute / Hosting enabled
• RIR: ARIN

**Geolocation Analysis**

• Reported Location: Montreal, Quebec, Canada
• Coordinates: 43.6319, -79.3716
• Geolocation Status: Implausible
• Violation: RTT measurement (26.0ms) significantly below minimum possible (121.6ms) for 6082km distance
• Probe Count: 5
• Average RTT: 28.4ms
• Min RTT: 26.0ms

**DNS & Network Services**

• PTR Hostname: proxy-ca005-san3.ahrefs.net
• Forward Resolution: proxy-ca005-san3.ahrefs.net
• Domain: ahrefs.net
• Open Ports: None detected (Firewalled / No Services)
• TLS Certificate: None
• HTTP Title: None
• Forward Resolution Count: 1

**Threat Indicators**

• Known Attacker: No
• Tor Exit Node: No
• Spam Source: No
• Blacklist Count: 0
• Pulsedive Risk: Not available
• Known Campaigns: None
• Threat Feeds: Empty

**Control Plane Assessment**

• BGP Prefix: 51.161.0.0/17
• DNSSEC: Valid
• CAA Records: Present
• DNSBL Listed: 1 of 8 total lists
• Route Stability: False
• Operator Score: 0.2174 (Minimal)
• Route Changes (30d): 0

**Historical Observations**

27 total observations recorded. Recent signal history indicates:

• Consistent "Minimal" operator classification (0.2174)
• Subnet abuse density flagged as "high_abuse" (0.7383)
• Geographic implausibility confirmed in multiple probes
• No persistent malicious threat patterns observed

**Subnet Neighborhood Analysis**

• Subnet: 51.161.37.0/24
• Total Siblings: 256
• Active Siblings: 205
• Threat Siblings: 189
• Abuse Density: 0.7383 (High)
• Inherited Risk: 29

Neighbor risk distribution within /24: 0 high-risk, 98 medium-risk, 2 low-risk. Notable neighbor IPs include:

• 51.161.37.0 (Risk: 50)
• 51.161.37.1 (Risk: 40)
• 51.161.37.2 (Risk: 40)

**Network Relationships**

59 relationships identified, all mapped to same network (OVH-CUST-281059684). No external organization, hostname, or certificate relationships detected.

**Recommended Mitigation Actions**

Firewall Rules:

```bash

# iptables

iptables -A INPUT -s 51.161.37.3 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.161.37.3 drop

# nginx

deny 51.161.37.3;

# pfSense

51.161.37.3/32

# Cloudflare WAF

{

"description": "Block 51.161.37.3 — IPDebrief risk score 40",

"action": "block",

"filter": {"expression": "ip.src eq 51.161.37.3"}

}

# AWS WAF

{

"Addresses": ["51.161.37.3/32"],

"Description": "IPDebrief risk 40"

}

```

**Intelligence Assessment**

IP 51.161.37.3 represents a cloud-hosted infrastructure asset with moderate risk characteristics. The absence of open ports and active threat indicators suggests the address may be dormant or actively managed. However, the subnet's high abuse density (0.7383) and 189 threat-sibling IPs warrant ongoing monitoring. Geographic implausibility indicates potential misconfiguration or spoofing attempts. Current recommendation: Monitor with blocking rules at perimeter, with escalation if outbound communication patterns emerge.

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*Generated by IPDebrief Intelligence System. Recommendations are probabilistic and should be combined with other signals before taking action.*

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