54.39.136.162📋 Copy

# IP Intelligence Briefing: 54.39.136.162/32

Date: 2026-06-21

Analyst: IPDebrief Intelligence Team

Classification: MODERATE RISK

---

## Executive Summary

IP 54.39.136.162 presents a moderate risk profile (Risk Score: 40) associated with OVH cloud infrastructure in Canada. The IP resolves to an Ahrefs proxy hostname but operates within a /24 subnet showing elevated abuse density (0.6641). While no direct threat indicators were observed, the neighborhood context suggests heightened surveillance of related addresses is warranted.

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## Technical Profile

Network Classification:

• Provider: OVH (ASN 16276)
• Organization: Dmytro, Ahrefs Pte Ltd
• Network Block: 54.39.136.0/24
• Infrastructure Type: CloudCompute (Hosted)
• Geolocation: Quebec, Canada (Beauharnois)

DNS Resolution:

• PTR Hostname: proxy-ca002-san162.ahrefs.net
• Domain: ahrefs.net
• Forward Confirmation: No
• Email Authentication: SPF/DMARC not configured

Network State:

• No open ports detected
• No TLS certificates or HTTP services running
• Classification: Firewalled / No Services

---

## Neighborhood Analysis

The /24 subnet demonstrates significant activity and abuse concentration:

• Total Siblings: 256
• Active Siblings: 185
• Threat Siblings: 170 (92% of active peers)
• Subnet Classification: High Abuse
• Inherited Risk Score: 26

Risk distribution across the subnet: 0 high-risk, 13 medium-risk, 87 low-risk peers. The subnet shows substantial peer threat density, suggesting the IP may be operating within a compromised or high-risk hosting environment.

---

## Observed Relationships

• Network Affiliation: Multiple same-network relationships to OVH-CUST-281059681
• DNS Associations: 15+ DNS relationships to proxy-ca002-san162.ahrefs.net
• Route Stability: Not stable (route changes observed in 30-day window)
• BGP Prefix: 54.39.0.0/16

---

## Historical Signals

Observation Count: 19 signals recorded

Key Historical Indicators:

• Cloud infrastructure classification consistently detected
• DNS association with ahrefs.net domain
• Operator score: 0.2174 (Minimal)
• DNSSEC valid; CAA records present
• No persistent malicious behavior observed

---

## Threat Indicators

• Blacklist Count: 0
• Known Attacker: No
• Tor Exit Node: No
• Spam Source: No
• Known Campaigns: None correlated
• DNSBL Listings: 1 of 8 total lists

---

## Anomalies & Observations

1. Geolocation Violation: RTT measurement (28ms) indicates discrepancy between reported Canada location and actual network path (minimum possible RTT: 112.6ms for 5,629km distance)

2. RTT Validation: Violation detected on 5 probes, suggesting potential misreporting or routing anomalies

---

## Recommended Actions

Immediate Mitigation

Block the IP across all security layers:

```bash

# iptables

iptables -A INPUT -s 54.39.136.162 -j DROP

# nftables

nft add rule inet filter input ip saddr 54.39.136.162 drop

# nginx

deny 54.39.136.162;

# pfSense

54.39.136.162/32

# Cloudflare WAF

{"description":"Block 54.39.136.162 — IPDebrief risk score 40", "action":"block", "filter":{"expression":"ip.src eq 54.39.136.162"}}

# AWS WAF

{"Addresses":["54.39.136.162/32"], "Description":"IPDebrief risk 40"}

```

Additional Considerations

1. Subnet Surveillance: Monitor the 54.39.136.0/24 subnet due to high abuse density (170 threat siblings)

2. Ahrefs Correlation: While the hostname suggests Ahrefs infrastructure, the abuse density context warrants continued monitoring

3. Geolocation Verification: Investigate RTT anomaly to validate actual source location

4. Peer Analysis: Consider profiling additional threat siblings in the /24 subnet to identify coordinated activity patterns

---

## Risk Assessment

Overall Risk: MODERATE (40/100)

Primary Concerns:

• High-abuse subnet environment (92% threat density among active peers)
• Geographic inconsistencies in reported location
• No direct threat indicators but elevated neighborhood context

Justification for Action: Despite moderate individual risk score, the subnet abuse density and operational context suggest blocking is prudent until further investigation clarifies the IP's actual usage patterns.

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*Report generated by IPDebrief Intelligence Platform. All data sourced from real-time network intelligence feeds.*

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