51.222.168.187📋 Copy

# IP INTELLIGENCE BRIEFING

Target IP: 51.222.168.187/32

Classification: HIGH-RISK CLOUD INFRASTRUCTURE

Risk Score: 40 (Moderate)

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## EXECUTIVE SUMMARY

IP 51.222.168.187 is a cloud-hosted proxy endpoint associated with the Ahrefs brand (OVH infrastructure). Despite the brand affiliation, the IP operates with moderate risk (40) within a subnet exhibiting critical abuse density (0.7812). The endpoint is firewalled with no active services detected, yet the surrounding /24 subnet demonstrates 78.12% abuse concentration with 200 threat-sibling IPs out of 256 total addresses.

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## OWNERSHIP AND INFRASTRUCTURE

• Provider: OVH (ASN 16276)
• Organization: Dmytro, Ahrefs Pte Ltd
• CIDR Block: 51.222.168.0/24
• Infrastructure Type: CloudCompute (OVH)
• Network Classification: Hosting/Cloud Infrastructure

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## GEOLOCATION ANALYSIS

• Primary Location: Canada (QC) per Cymru geolocation
• Secondary Location: Singapore (geolocation consensus flagged)
• Distance Discrepancy: 5,597.9 km from origin (56.13°N, 106.35°W)
• Minimum RTT: 134ms (5 probes)
• Note: Significant geolocation inconsistency warrants verification

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## THREAT POSTURE

Threat Persistence: 1 observation event, not persistently malicious.

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## NETWORK BEHAVIOR

• Open Ports: None (Firewalled / No Services)
• DNS PTR: proxy-ca018-san187.ahrefs.net
• Forward Resolution: proxy-ca018-san187.ahrefs.net (Confirms Ahrefs infrastructure)
• HTTP Services: None detected
• TLS Certificates: None

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## SUBNET NEIGHBORHOOD ANALYSIS

Subnet: 51.222.168.0/24

• Abuse Density: 0.7812 (HIGH)
• Total Siblings: 256
• Active Siblings: 229
• Threat Siblings: 200
• Inherited Risk: 31
• Risk Distribution: 100 medium-risk neighbors, 0 high-risk neighbors

Implication: The /24 subnet demonstrates systemic abuse patterns. The target IP should be evaluated in context of neighbor risk.

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## OBSERVATION HISTORY

• Total Signals: 24 observations
• Most Recent: 2026-06-18 (subnet abuse classification)
• Historical Trend: Consistent high-abuse subnet classification
• DNS Records: Confirmed ahrefs.net ownership (2026-06-14)
• Geolocation: Inconsistent country assignments (CA vs SG)

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## ATTACK SURFACE

• Service Exposure: None (firewalled)
• Port Scanning: No open ports detected
• Banner Detection: None
• TLS Services: None
• Certificate Chains: None

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## RECOMMENDED ACTIONS

Immediate Mitigation

```

iptables -A INPUT -s 51.222.168.187 -j DROP

```

Contextual Assessment

Despite the "Moderate Risk" score (40), the following factors warrant defensive consideration:

1. High-abuse subnet density (0.7812)

2. 200 threat-sibling IPs in the /24

3. DNSBL listing on 1 of 8 lists

4. Cloud hosting infrastructure with no legitimate service exposure

Recommended Firewall Rules

• nftables: `nft add rule inet filter input ip saddr 51.222.168.187 drop`
• NGINX: `deny 51.222.168.187;`
• pfSense: 51.222.168.187/32
• Cloudflare WAF: Block IP with description "IPDebrief risk score 40"
• AWS WAF: Add to allow/block list as IP 51.222.168.187/32

---

## INTELLIGENCE NOTE

This IP represents a legitimate brand (Ahrefs) but operates within a cloud environment showing elevated abuse patterns. The firewalled nature suggests either legitimate backend infrastructure or compromised hosting. Given the subnet-level abuse concentration, treat as suspicious for inbound traffic. Verify egress patterns if this IP appears in outbound logs.

Confidence Level: High (multiple corroborating signals)

Last Updated: 2026-06-18

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