54.39.6.188📋 Copy

# THREAT INTELLIGENCE BRIEFING

IP Address: 54.39.6.188/32

Classification: Moderate Risk / High Abuse Subnet

Report Date: 2026-06-19

Analyst: IPDebrief Intelligence Team

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## EXECUTIVE SUMMARY

IP 54.39.6.188 presents a moderate risk profile (risk score: 40) within a high-abuse subnet environment. The address is associated with OVH cloud infrastructure and resolves to the Ahrefs domain ecosystem. While the specific IP lacks direct threat indicators, its subnet exhibits elevated abuse characteristics requiring network monitoring.

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## INFRASTRUCTURE PROFILE

Ownership & Network:

• ASN: 16276 (OVH)
• Organization: Dmytro, Ahrefs Pte Ltd
• CIDR Block: 54.39.6.0/24
• Network Classification: CloudCompute / Hosting
• Infrastructure Type: OVH Customer Network

Geolocation:

• Country: Canada (CA)
• Region: Quebec (QC)
• City: Beauharnois
• Geo Validation: GeoPlausible flag set to false; RTT discrepancy indicates potential data inconsistency

DNS Resolution:

• PTR Hostname: proxy-ca001-san188.ahrefs.net
• Forward Resolution: proxy-ca001-san188.ahrefs.net (ahrefs.net domain)
• Forward Confirmed: No
• Email Authentication: SPF and DMARC not configured

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## THREAT ASSESSMENT

Risk Indicators:

• Overall Risk Score: 40 (Moderate)
• Blacklist Count: 0
• DNSBL Listed: 1 of 8 lists
• Abuse Confidence Score: Not available
• Tor Exit Node: No
• Known Attacker: No
• Spam Source: No

Network Role:

• Provider: OVH
• Is Cloud: Yes
• Is Hosting: Yes
• Is CDN/VPN/Proxy/Tor: No
• Active Services: None detected (firewalled/no services)

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## SUBNET ANALYSIS: 54.39.6.0/24

The parent subnet demonstrates significant abuse activity:

Neighbor Risk Distribution: 100 medium-risk neighbors, 0 high-risk, 0 low-risk

This subnet-level activity suggests the IP is operating within a shared hosting environment with elevated abuse potential.

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## TEMPORAL OBSERVATIONS

Historical data reveals consistent threat characteristics:

• June 19, 2026: Abuse density 0.668, 171 threat siblings
• June 14, 2026: Abuse density 0.5977, 153 threat siblings

Trend Analysis: Subtle reduction in abuse density and threat sibling count over 5-day observation window. No evidence of persistent malicious activity. Threat persistence days: 0.

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## RELATIONSHIP MAPPING

52 relationships identified, primarily network-level associations to OVH-CUST-281059680. No external entity correlations detected (no correlated IPs, campaigns, or certificate matches).

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## RECOMMENDED ACTIONS

Firewall Blocking Rules:

Analysis Notes:

• No specific security action recommendations generated due to moderate risk classification
• Subnet-level blocking may be warranted given high abuse density (0.668)
• Monitor for service activation on this IP

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## INTELLIGENCE CONCLUSION

IP 54.39.6.188 operates within a high-abuse OVH hosting subnet but lacks direct threat indicators. The address resolves to legitimate Ahrefs infrastructure. SOC analysts should:

1. Implement blocking rules as recommended

2. Monitor for service activation (currently firewalled)

3. Consider subnet-level blocking if operational security warrants

4. Re-evaluate based on traffic patterns and incident correlation

Risk Rating: Moderate - Monitor / Block as per organizational policy for OVH-hosted IPs in high-abuse subnets.

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*Data sourced from IPDebrief intelligence platform. Analysis based on observed signals as of 2026-06-19.*

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