51.161.65.169📋 Copy

# IP INTELLIGENCE BRIEFING: 51.161.65.169/32

Classification: Moderate Risk | Last Updated: 2026-06-26

## Executive Summary

IP 51.161.65.169 is a moderate-risk (40) hosting infrastructure address associated with OVH network in Montreal, Canada. The IP resolves to the ahrefs.net domain with PTR hostname proxy-ca011-san169.ahrefs.net. No active threat indicators are present, but the IP resides within a high-abuse density subnet (0.7305) with 187 malicious sibling IPs.

## Ownership & Infrastructure

• Provider: OVH (ASN 16276)
• Organization: Dmytro, Ahrefs Pte Ltd
• CIDR Block: 51.161.65.0/24
• Network Classification: Hosting infrastructure
• DNS PTR: proxy-ca011-san169.ahrefs.net (ahrefs.net)
• Service State: Firewall/No services detected on open ports

## Threat Assessment

• Risk Score: 40 (Moderate)
• Abuse Confidence: Not scored
• Known Campaigns: None identified
• Blacklist Status: 0 direct hits; 1 DNSBL listing of 8 total
• Infrastructure Type: Cloud/hosting (not CDN, VPN, proxy, or Tor)
• Tor Exit Node: No
• Known Attacker: No

## Neighborhood Analysis

Subnet 51.161.65.0/24 shows elevated abuse activity:

• Abuse Density: 0.7305 (high_abuse classification)
• Total Siblings: 256
• Active Siblings: 212
• Threat Siblings: 187
• Inherited Risk Score: 29
• Risk Distribution: Medium (100 siblings), High (0), Low (0)

The high concentration of threat siblings in this /24 indicates potential infrastructure sharing with malicious actors.

## Geolocation Validation

Status: INCONSISTENT

• Reported Location: Montreal, QC, CA
• Distance Anomaly: 6,082km reported distance with 25ms RTT (minimum possible: 121.6ms)
• Assessment: Geolocation data is implausible; RTT metrics indicate location spoofing

## Historical Observations

21 signal observations recorded. Consistent signals show:

• OVH provider classification
• Cloud/hosting infrastructure type
• Subnet abuse density of 0.7305 observed as of 2026-06-19
• Stable network classification with no ownership changes

## Recommended Security Actions

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

iptables:

```

iptables -A INPUT -s 51.161.65.169 -j DROP

```

nftables:

```

nft add rule inet filter input ip saddr 51.161.65.169 drop

```

nginx:

```

deny 51.161.65.169;

```

Cloudflare WAF:

```json

{

"description": "Block 51.161.65.169 — IPDebrief risk score 40",

"action": "block",

"filter": {"expression": "ip.src eq 51.161.65.169"}

}

```

AWS WAF:

```json

{

"Addresses": ["51.161.65.169/32"],

"Description": "IPDebrief risk 40"

}

```

## Intelligence Notes

1. The IP belongs to a hosting provider (OVH) with a legitimate domain association (ahrefs.net)

2. No direct threat indicators detected on this specific IP

3. However, subnet abuse density is significantly elevated (187 threat siblings)

4. Geolocation data appears spoofed; RTT anomalies suggest location falsification

5. Consider blocking or monitoring based on organizational policy due to neighborhood context

---

*This briefing is based on data returned from IPDebrief intelligence platform. Recommendations should be combined with other signals before taking action.*

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