5.39.109.179📋 Copy

# IP Intelligence Briefing: 5.39.109.179/32

Classification: Moderate Risk - Cloud Hosting Infrastructure

Date: 2026-06-19

Analyst: IPDebrief Intelligence

---

## Executive Summary

IP address 5.39.109.179 is a cloud-based hosting resource operated by Ahrefs Pte Ltd Dmytro (ASN 16276, OVH infrastructure) with a moderate risk score of 40. The IP resolves to the ahrefs.net domain with hostname proxy-fr009-san179.ahrefs.net. While the IP is not identified as a known attacker or spam source, it is hosted in a high-abuse density subnet (5.39.109.0/24) with 19 threat siblings out of 24 total IPs. The IP was listed on 1 DNSBL (of 8 total checks), indicating some reputation friction. No active threat indicators or campaign associations were detected.

---

## Technical Profile

Ownership & Infrastructure:

• ASN: 16276 (OVH)
• Organization: Ahrefs Pte Ltd Dmytro
• Registration: RIPE NCC
• Infrastructure Type: CloudCompute
• Hosting Status: Yes (confirmed)
• Service Purpose: Firewalled / No Services

Geolocation:

• Country: France (FR)
• Coordinates: 46.23, 2.21 (claimed)
• Distance Discrepancy: 500.4 km from claimed location
• RTT: 91.4 ms average (5 probes)
• GeoValidation: Plausible but with notable distance variance

DNS & Network:

• PTR Hostname: proxy-fr009-san179.ahrefs.net
• Forward Resolution: proxy-fr009-san179.ahrefs.net (ahrefs.net)
• DNSSEC: Valid
• DNSBL Listed: 1 of 8 lists
• Open Ports: None detected

---

## Threat Assessment

Risk Indicators:

• Risk Score: 40/100 (Moderate)
• Abuse Confidence: Not applicable (no confirmed attacks)
• Threat Feeds: None
• Known Campaigns: None
• Tor Exit Node: No
• Proxy/VPN: No

Reputation Sources:

• Operator Score: 0.2174 (Minimal)
• Abuse Density (Subnet): 0.7917 (High)
• Inherited Risk: 31

Behavioral Signals:

• Threat Persistence Days: 0
• Is Persistently Malicious: No
• Honeypot Hits: 0

---

## Neighborhood Analysis

Subnet Overview (5.39.109.0/24):

• Total Siblings: 24
• Active Siblings: 12
• Threat Siblings: 19
• Abuse Density: 0.7917 (High classification)

Neighbor Risk Distribution:

• All 23 sampled neighbors show consistent Risk Score: 40
• Authority Scores: 50 (uniform across subnet)
• Classification: High abuse density environment

Implication: This IP shares infrastructure with multiple high-risk addresses, suggesting the /24 subnet may be used for bulk hosting or has systemic abuse issues.

---

## Observation History

Signal Timeline:

• Observations: 23 total
• Most Recent: 2026-06-19T10:41:27 UTC
• Threat Observation Count: 1

Key Historical Signals:

• 2026-06-14: Subnet abuse density recorded (0.7917, high_abuse classification)
• 2026-06-14: Geolocation validation with 500.4 km distance variance from claimed location
• 2026-06-19: Operator score validation (0.2174)

Trend: No escalation pattern detected. Risk profile has remained stable.

---

## Recommended Actions

Immediate Mitigation:

```

# Block outbound connections (conservative)

iptables -A OUTPUT -d 5.39.109.179/32 -j DROP

# Rate-limit inbound if required

iptables -A INPUT -s 5.39.109.179/32 -m limit --limit 10/min --limit-burst 20 -j ACCEPT

# DNSBL check (if using DNSBL)

dig txt 5.39.109.179.blacklist-check.net

```

Monitoring Recommendations:

• Monitor for new DNSBL additions (currently 1 of 8 lists)
• Track subnet abuse density changes in 5.39.109.0/24
• Verify geolocation accuracy (France vs. US-NY discrepancy)
• Alert on any service port openings

Allow List Consideration:

• IP is associated with ahrefs.net (legitimate SEO tooling provider)
• No direct attack indicators present
• Consider whitelisting if legitimate business relationship exists
• Verify against your organization's ahrefs.net usage policies

---

## Conclusion

IP 5.39.109.179 represents a cloud-hosting resource with moderate risk characteristics. The IP is not directly malicious but operates within a high-abuse-density subnet. The connection to ahrefs.net suggests potential legitimate use cases, though the hosting environment shows systemic abuse indicators. Recommend baseline monitoring and contextual review based on organizational requirements. No immediate blocking required unless specific threat indicators emerge.

Confidence Level: High (comprehensive profile available)

Recommended Action: Monitor / Contextual Review

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