51.161.37.147📋 Copy

# IP INTELLIGENCE BRIEFING: 51.161.37.147

Date: 2026-06-14

Classification: Moderate Risk

Prepared For: SOC Operations

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## EXECUTIVE SUMMARY

IP 51.161.37.147 is classified as a Moderate Risk (score: 40/100) infrastructure address operated by Ahrefs Pte Ltd within the OVH hosting ecosystem. The address shows no active threat indicators but operates within a high-abuse-density subnet. No immediate blocking is warranted; monitor for behavioral changes.

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## OWNERSHIP AND INFRASTRUCTURE

The IP resolves to hostname `proxy-ca005-san147.ahrefs.net` with reverse DNS confirmed. No open ports, TLS certificates, or HTTP services detected during scanning.

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## GEOLOCATION ANALYSIS

⚠️ GEOVALIDATION ALERT: Significant RTT anomaly detected. Probe RTT of 27ms contradicts minimum possible RTT of 121.6ms for 6082km distance, suggesting potential data quality issues or misreported geolocation.

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## NEIGHBORHOOD CONTEXT

The /24 subnet exhibits elevated abuse activity:

• Abuse Density: 0.6562 (High)
• Total Siblings: 256
• Active Siblings: 195 (76%)
• Threat Siblings: 168 (65.6%)

Risk Distribution in Subnet:

• High Risk: 0
• Medium Risk: 99 (39%)
• Low Risk: 1 (0.4%)

This indicates the subnet contains predominantly legitimate infrastructure with scattered abuse activity. The target IP inherits a risk score of 26 from neighborhood context.

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## THREAT INDICATORS

Current Status: CLEAN

No threat indicators detected in current observation window.

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## OBSERVATION HISTORY

Total Observations: 22 signals tracked

Recent Signal Timeline:

• 2026-06-14 18:55:05 UTC — Subnet abuse density classification (confidence: 0.75)
• 2026-06-14 18:53:57 UTC — Geolocation signal: Canada (confidence: 0.18)
• 2026-06-14 18:53:24 UTC — Operator score: Minimal (0.2174)
• 2026-06-14 18:53:21 UTC — Geolocation: Montreal, QC via AlienVault OTX

Temporal Analysis: No ownership changes detected. Threat persistence days: 0. IP is not persistently malicious.

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## RELATIONSHIP GRAPH

Total Relationships: 57

• Same Network: 57 instances (OVH-CUST-281059684)

All relationships indicate membership in the same OVH customer network block. No cross-organization or certificate-based relationships detected.

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## SECURITY RECOMMENDATIONS

Immediate Actions

1. Monitor Traffic: No blocking required. Monitor for unusual outbound connections.

2. Geo-Validation: Investigate RTT anomaly if this IP appears in threat intelligence feeds.

3. Subnet Awareness: Be aware of 168 threat-sibling IPs within the same /24 subnet.

Firewall Rules

No specific firewall rules generated. Standard egress filtering recommended for any traffic to/from this subnet.

Watch Indicators

• New blacklist entries
• Port/service openings
• Behavioral changes in connection patterns
• Related IPs in 51.161.37.0/24 subnet appearing in campaigns

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## CONCLUSION

IP 51.161.37.147 represents legitimate infrastructure with moderate risk classification. While operating in a high-abuse-density subnet, the address itself shows no active threat indicators. Geo-location validation discrepancies warrant monitoring but do not constitute immediate threat. Maintain standard monitoring practices for this subnet.

Status: ACTIVE — No Action Required

Review Frequency: Monthly or upon threat intelligence updates

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