51.89.129.224📋 Copy

# IP INTELLIGENCE BRIEFING: 51.89.129.224/32

## EXECUTIVE SUMMARY

The target IP 51.89.129.224 presents a MODERATE RISK profile (Risk Score: 40) with legitimate ownership credentials but significant neighborhood-level threat indicators. The IP resolves to Ahrefs infrastructure in London, GB, but operates within a high-abuse density subnet (/24) containing 180 confirmed threat siblings. SOC analysts should monitor for activity patterns consistent with compromised proxy infrastructure while recognizing the legitimate service association.

## OWNERSHIP & INFRASTRUCTURE

• Organization: Ahrefs Pte Ltd Dmytro (AS16276 - OVH SAS)
• Infrastructure Type: CloudCompute/Hosting
• Geolocation: London, England, GB (GeoPlausible: true)
• BGP Prefix: 51.89.0.0/16 (Route Stability: false)
• Service Classification: Firewalled / No Services (No open ports detected)
• DNS Records: proxy-uk008-san224.ahrefs.net (Forward resolution confirmed)

## THREAT INDICATORS

• DNSBL Listings: 1 out of 8 total lists (dnsblListedCount: 1)
• Abuse Confidence: Moderate
• Known Campaigns: None detected
• Tor Exit Node: No
• Known Attacker: No
• Spam Source: No
• Operator Score: 0.2174 (Minimal)

## NEIGHBORHOOD ANALYSIS (51.89.129.0/24)

• Abuse Density: 0.7031 (CLASSIFIED: HIGH ABUSE)
• Total Subnet Siblings: 256
• Active Siblings: 194
• Confirmed Threat Siblings: 180
• Risk Distribution: 99 medium risk, 1 low risk, 0 high risk
• Inherited Risk: 28

The /24 subnet demonstrates significant abuse patterns with 70% abuse density, suggesting shared hosting infrastructure where legitimate services coexist with compromised endpoints.

## OBSERVATION HISTORY (22 observations)

• Latest Signals: 2026-06-23 (DNS resolution to ahrefs.net, CAA records verified)
• Historical Threat Activity: Multiple pulse detections from AlienVault OTX
• Operator Classification: Minimal (consistent across observations)
• Threat Persistence: No persistent malicious behavior detected
• Ownership Changes: 0 (Stable ownership)

## NETWORK RELATIONSHIPS

• Total Relationships: 65 detected
• Primary Network: OVH_282347344 (Multiple instances)
• Same ASN Associations: AS16276 (OVH SAS)

## RECOMMENDED ACTIONS

Immediate Mitigation

Monitoring Recommendations

1. Block inbound connections from this IP while maintaining visibility into outbound traffic patterns

2. Monitor associated subnet (51.89.129.0/24) for lateral movement or compromised neighbor activity

3. Correlate with threat feeds for Ahrefs-related IPs showing malicious behavior

4. Review logs for any legitimate Ahrefs service disruption indicators

## ANALYST NOTES

This IP presents a legitimate business case (Ahrefs SEO tools) within a high-risk hosting environment. The moderate risk score combined with the subnet's high abuse density suggests potential infrastructure sharing with malicious actors. Blocking is recommended for defensive posture, but the legitimate service association warrants incident review if traffic patterns indicate normal Ahrefs operations. Monitor for any escalation in threat indicators or changes in DNS behavior.

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*Intelligence generated by IPDebrief threat intelligence platform. Recommendations are probabilistic and should be combined with contextual signals before enforcement.*

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