51.222.168.176📋 Copy

# INTELLIGENCE BRIEFING: 51.222.168.176/32

Classification: MODERATE RISK — High-Abuse Cloud Infrastructure

Risk Score: 40/100

Analysis Date: Current

Intel Source: IPDebrief Threat Intelligence Platform

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## EXECUTIVE SUMMARY

IP 51.222.168.176 is a cloud compute endpoint hosted within OVH's 51.222.0.0/16 prefix under customer block OVH-CUST-281059697. The address resolves to the ahrefs.net domain (proxy-ca018-san176.ahrefs.net) and presents as a firewalled/no-services endpoint. While not flagged as a known attacker or Tor exit node, the IP operates within a high-abuse subnet exhibiting elevated threat activity.

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## OWNERSHIP AND INFRASTRUCTURE

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## GEOLOCATION ANALYSIS

Note: Geolocation inconsistencies indicate potential data spoofing or routing anomalies.

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## THREAT PROFILE

DNS Reputation: Forward resolution confirmed to proxy-ca018-san176.ahrefs.net. No email authentication records (SPF/DMARC) detected.

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## SUBNET CONTEXT (51.222.168.0/24)

Critical Finding: The /24 subnet demonstrates systemic abuse characteristics with 89.5% of active addresses flagged as threats. This indicates infrastructure-level compromise or shared hosting abuse patterns.

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## OBSERVATION HISTORY

• Total Signals: 22 observations
• Recent Activity: Signals observed as recently as 2026-06-28
• Ownership Stability: No changes (0 ownership transitions)
• Threat Persistence: Single threat observation, not persistently malicious
• Signal Types: Routing, geolocation, subnet abuse classification, ownership signals

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## NETWORK CLASSIFICATION

Services: No open ports detected. Endpoint appears firewalled with no active services.

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## RECOMMENDED SECURITY ACTIONS

Immediate Mitigation

Firewall Rules (Block/IP Drop):

```bash

# iptables

iptables -A INPUT -s 51.222.168.176 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.222.168.176 drop

# nginx

deny 51.222.168.176;

# pfSense

51.222.168.176/32

# Cloudflare WAF

ip.src eq 51.222.168.176 → Block

# AWS WAF

Addresses: 51.222.168.176/32

```

Analysis Notes:

• Risk score of 40 warrants monitoring but does not indicate confirmed malicious activity
• High-abuse subnet context suggests blocking may reduce exposure to lateral threat vectors
• No specific attack signatures identified at this IP level

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## INTELLIGENCE ASSESSMENT

The IP operates within a high-abuse OVH cloud environment. While the address itself lacks direct threat indicators, the subnet-level abuse density (0.8008) and threat sibling ratio (89.5%) create elevated risk for shared infrastructure compromise. The ahrefs.net association may indicate legitimate SEO/marketing tooling, but geolocation inconsistencies and subnet characteristics warrant continued monitoring.

Recommended Action: Implement IP-level blocking as baseline protection while monitoring for related activity in the 51.222.168.0/24 range.

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*Intelligence generated from IPDebrief platform analysis. Rules should be combined with other threat signals before deployment.*

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