51.161.37.122📋 Copy

# IPDEBRIEF INTELLIGENCE BRIEFING

Target: 51.161.37.122/32

Date: Current Analysis

Classification: Moderate Risk

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## EXECUTIVE SUMMARY

IP 51.161.37.122 is registered to OVH-CUST-281059684 under organization "Dmytro, Ahrefs Pte Ltd" (ASN 16276). The address resolves to ahrefs.net with hostname proxy-ca005-san122.ahrefs.net. Risk assessment scores Moderate Risk (40/100) with no active threat indicators. However, the IP resides within a high-abuse-density subnet (51.161.37.0/24) with 191 threat siblings out of 256 total addresses.

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## OWNERSHIP & INFRASTRUCTURE

• ASN: 16276 (OVH)
• Organization: Dmytro, Ahrefs Pte Ltd
• Network Block: 51.161.37.0/24
• Infrastructure Type: CloudCompute
• Connection Type: Hosting
• Geolocation: Listed as Singapore (geolocation validation flagged as implausible per RTT analysis)

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## THREAT ASSESSMENT

• Risk Score: 40 (Moderate Risk)
• Abuse Confidence: Not scored
• Known Attacker: No
• Spam Source: No
• Tor Exit Node: No
• Blacklist Count: 0
• DNSBL Listed: 1/8 total lists
• Active Threat Indicators: None detected

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## NETWORK CONTEXT & NEIGHBORHOOD ANALYSIS

The target IP operates within subnet 51.161.37.0/24 classified as high_abuse with abuse density of 0.7461.

Subnet Statistics:

• Total Siblings: 256
• Active Siblings: 198
• Threat Siblings: 191
• Inherited Risk Score: 29

Neighbor Risk Distribution:

• High Risk: 0
• Medium Risk: 99
• Low Risk: 1

This high abuse density indicates the subnet is being leveraged by multiple entities with varying risk profiles. The target IP's risk score (40) aligns with neighborhood characteristics.

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## DNS & SERVICES

• Reverse DNS: proxy-ca005-san122.ahrefs.net
• Forward Resolution: proxy-ca005-san122.ahrefs.net
• Open Ports: None detected
• HTTP Services: None detected
• TLS Certificates: None detected
• Email Authentication: SPF/DMARC not configured (0 TXT records)

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## OBSERVATION HISTORY

Total observations: 18

Recent Signals:

• 2026-06-20: DNS resolution to ahrefs.net (confidence 0.80)
• 2026-06-15: Subnet classification as high_abuse (confidence 0.75)
• 2026-06-15: Operator score minimal (0.2174) (confidence 0.60)
• 2026-06-10: Ownership stability confirmed (confidence 0.85)

Temporal Analysis:

• Ownership Changes: 0
• Threat Persistence Days: 0
• Persistently Malicious: False
• Threat Observation Count: 1

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## RELATIONSHIP GRAPH

31 relationships identified:

• Network Associations: Multiple entries for OVH-CUST-281059684
• DNS Associations: 17 entries for proxy-ca005-san122.ahrefs.net

No cross-organization or cross-network relationships detected. All associations confirm legitimate ahrefs.net infrastructure.

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## RECOMMENDED ACTIONS

Firewall Rules

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## ANALYST NOTES

While the IP resolves to legitimate ahrefs.net infrastructure, the high-abuse-density neighborhood warrants cautious monitoring. No active malicious indicators were detected. The geolocation discrepancy (Singapore listing with implausible RTT metrics) suggests potential reputation data contamination. Recommend blocking based on neighborhood risk profile, but verify against actual traffic patterns before enforcement.

Status: Monitor/Block Pending SOC Validation

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