54.39.6.3📋 Copy

# IP Intelligence Briefing: 54.39.6.3/32

Classification: Moderate Risk (Score: 40/100)

Date: Current Intelligence Cycle

Prepared For: SOC Analysts

## Executive Summary

IP 54.39.6.3 is a cloud-compute infrastructure address associated with OVH hosting (ASN 16276) operating under entity Dmytro, Ahrefs Pte Ltd. The IP resolves to hostname proxy-ca001-san3.ahrefs.net within the ahrefs.net domain. No open services or active threats were observed, but the subnet demonstrates elevated abuse density (0.6602) with high-abuse classification. The IP is currently firewalled with no accessible services.

## Ownership and Network Context

• Organization: Dmytro, Ahrefs Pte Ltd
• ASN: 16276 (OVH SAS)
• Network Block: 54.39.6.0/24
• Geolocation: Canada (QC) – Beauharnois
• Infrastructure Type: Cloud Compute / Hosting Provider
• Provider: OVH

## DNS and Service Analysis

• PTR Record: proxy-ca001-san3.ahrefs.net
• Forward Resolution: Confirmed (ahrefs.net)
• HTTP Services: None accessible (firewalled)
• Open Ports: None detected
• TLS Certificates: None exposed
• Email Auth: SPF and DMARC records not configured

## Threat Indicators

• Risk Score: 40 (Moderate)
• Abuse Confidence Score: Not reported
• Blacklist Status: Not blacklisted (0 lists)
• Known Campaigns: None identified
• Tor Exit/Proxy: Not detected
• Threat Persistence: 0 days observed
• Persistent Malicious Activity: False

## Subnet Neighborhood Assessment

• Subnet: 54.39.6.0/24
• Abuse Density: 0.6602 (High Abuse Classification)
• Active Siblings: 174 of 256 total
• Threat Siblings: 169
• Inherited Risk Score: 26
• Risk Distribution: 100 medium-risk neighbors, 0 high-risk

## Control Plane and Routing

• BGP Prefix: 54.39.0.0/16
• Origin ASN: 16276
• Route Stability: False
• RPKI State: Not validated
• DNSSEC: Valid
• DNSBL Listings: 1 of 8 total lists

## Observational History

The IP has generated 23 signal observations. Recent activity indicates:

• No ownership changes recorded
• Single threat observation detected
• Control plane operator score: 0.2174 (Minimal)
• No persistent malicious behavior pattern identified

## Geolocation Validation

• Distance Anomaly: 5,628.6 km reported
• RTT Violation: 29.0ms observed vs. minimum possible 112.6ms
• Probe Count: 5 probes
• Consensus: GeoPlausible = False (distance data inconsistent)

## Recommended Actions

Based on the moderate risk profile and high-abuse neighborhood context:

1. Monitor Closely: The subnet demonstrates elevated abuse density with 169 threat-sibling IPs. Monitor for lateral movement or coordinated activity.

2. DNS Monitoring: Track proxy-ca001-san3.ahrefs.net for any service changes or C2 activity.

3. Email Reputation: No SPF/DMARC configured; evaluate impact on email deliverability if this IP is used for outbound mail.

4. Network Segmentation: Consider blocking or rate-limiting traffic to/from this subnet given the high-abuse classification.

## Related Entities

• Network: OVH-CUST-281059680 (45 relationship entries)
• Domain: ahrefs.net (1 hosted domain)
• ASN: 16276 (OVH)

Assessment: The IP represents legitimate cloud infrastructure within a high-abuse OVH subnet. While the IP itself shows no active malicious indicators, the neighborhood context warrants continued monitoring. No immediate blocking required, but maintain awareness of subnet-level threat activity.

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