54.39.203.107📋 Copy

# INTELLIGENCE BRIEFING: 54.39.203.107

Classification: Moderate Risk (Score: 40/100)

Date: Current Analysis

Analyst: IPDebrief Intelligence Team

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## EXECUTIVE SUMMARY

IP address 54.39.203.107 is a cloud infrastructure host operated within OVH's hosting network under Ahrefs Pte Ltd (AS16276). The IP exhibits moderate risk characteristics with significant neighborhood abuse context. No direct threat indicators detected, but the subnet environment warrants operational awareness.

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## INFRASTRUCTURE PROFILE

Ownership & Classification:

• Organization: Dmytro, Ahrefs Pte Ltd
• Network: OVH-CUST-281059687
• ASN: 16276 (OVH SAS)
• Geolocation: Beauharnois, Quebec, Canada (CA)
• Infrastructure Type: Cloud Compute / Hosting
• CIDR: 54.39.203.0/24

Network Role:

• Hosting Provider: Yes
• Cloud Infrastructure: Yes
• CDN/Proxy/VPN: No
• Tor Exit: No
• Service Status: Firewalled / No Services Detected

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## THREAT ASSESSMENT

Risk Indicators:

• Risk Score: 40/100 (Moderate Risk)
• Abuse Confidence: Not scored
• Blacklist Count: 0
• DNSBL Listings: 1 of 8 lists (dnsblListedCount: 1)
• Known Campaigns: None detected

Threat Classification Flags:

• Is Known Attacker: False
• Is Spam Source: False
• Is Persistently Malicious: False

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## NEIGHBORHOOD CONTEXT

Subnet Analysis (54.39.203.0/24):

• Abuse Density: 0.6719 (67.19% - HIGH ABUSE CLASSIFICATION)
• Total Siblings: 256
• Active Siblings: 225 (88% utilization)
• Threat Siblings: 172 (76% of active IPs flagged)
• Inherited Risk Score: 26

Risk Distribution in Subnet:

• High Risk: 0
• Medium Risk: 42 (16.4%)
• Low Risk: 58 (22.7%)

The subnet demonstrates elevated abuse activity, with 172 IPs in the /24 range flagged as threats. This contextual risk factor should be considered in security decision-making.

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## OBSERVATION HISTORY

Recent signal observations (June 20, 2026) indicate:

• Geographic Validation: RTT anomaly detected (31ms observed vs. 112.6ms minimum possible for 5,629km distance). Location marked as geo-plausible: false.
• DNS Resolution: proxy-ca008-san107.ahrefs.net (ahrefs.net domain)
• Network Signals: OVH infrastructure with associated threat pulses from AlienVault OTX
• Stability: Ownership stable, no recent changes
• Threat Persistence: 0 days observed (not persistently malicious)

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## RELATIONSHIP GRAPH

Entity Associations: 46 relationships identified

• Primary Link: Same Network (OVH-CUST-281059687) - 41 duplicate relationship entries indicating consistent network attribution
• No cross-organization or campaign-based relationships detected

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## RECOMMENDED ACTIONS

Security Recommendations:

• Risk score of 40 warrants monitoring but not immediate blocking without additional context
• No specific threat-based recommendations beyond standard network hygiene

Firewall Rules (for reference):

```bash

# iptables

iptables -A INPUT -s 54.39.203.107 -j DROP

# nftables

nft add rule inet filter input ip saddr 54.39.203.107 drop

```

Cloud Platform Rules:

• Cloudflare WAF: Block 54.39.203.107
• AWS WAF: Block 54.39.203.107/32

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## OPERATIONAL ASSESSMENT

This IP represents OVH cloud hosting infrastructure associated with Ahrefs, a legitimate SEO analytics company. However, the high abuse density (67%) in the hosting subnet indicates this infrastructure may be shared or misused. The geographic location inconsistencies and DNSBL listing suggest some level of activity requiring attention.

Key Considerations for SOC Teams:

1. Monitor for outbound traffic patterns from this subnet

2. Be aware of the high-abuse neighborhood context when investigating incidents

3. No immediate blocking recommended based on profile alone

4. Consider subnet-level monitoring given 76% threat sibling ratio

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End of Briefing

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