51.222.168.137📋 Copy

# IP INTELLIGENCE BRIEFING

Target: 51.222.168.137/32

Classification: Moderate Risk

Date: Current Intelligence Cycle

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## EXECUTIVE SUMMARY

IP 51.222.168.137 is a cloud-compute endpoint hosted on OVH infrastructure with a risk score of 40 (Moderate Risk). The IP resolves to Ahrefs proxy infrastructure but exhibits significant geolocation anomalies and operates within a subnet classified as high-abuse density. No active threat indicators are currently present, but the network context warrants defensive monitoring.

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## OWNERSHIP & INFRASTRUCTURE

The IP operates on OVH hosting infrastructure. DNS records resolve to `proxy-ca018-san137.ahrefs.net`, indicating association with Ahrefs proxy services. No open ports or active services were detected.

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## GEOLOCATION VALIDATION

Status: FAILED

• Claimed Location: Singapore (city), Canada (country code: CA)
• RTT Measurement: 27ms average
• Claimed Distance: 5,597.9 km
• Minimum Possible RTT: 112.0ms

The geolocation data is geographically implausible. The measured RTT (27ms) is less than 25% of the minimum physically possible RTT (112ms) for the claimed distance, indicating spoofed or unreliable location metadata.

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## THREAT ASSESSMENT

No active threat indicators detected. However, the IP appears on 1 of 8 DNSBL lists. The subnet 51.222.168.0/24 exhibits high abuse density (0.7812) with 200 threat siblings among 256 total addresses.

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## NETWORK CONTEXT

• Subnet: 51.222.168.0/24
• Abuse Density: 0.7812 (High Abuse)
• Active Siblings: 229 of 256 IPs
• Threat Siblings: 200
• Inherited Risk Score: 31
• Control Plane: BGP prefix 51.222.0.0/16 (Origin ASN 16276)

The subnet demonstrates significant abuse prevalence. Over 78% of addresses in the /24 block are associated with abuse activity.

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## OBSERVATION HISTORY

• Total Observations: 23
• Threat Persistence: 0 days
• Persistent Malicious: No
• Recent Signals: Multiple observations from June 2026 showing consistent subnet abuse classification

Historical data indicates no persistent malicious behavior, but recurring subnet abuse classification is consistent.

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## RECOMMENDED ACTIONS

Given the moderate risk score, geolocation anomalies, and high-abuse subnet context, the following defensive measures are recommended:

Firewall Rules

```bash

# iptables

iptables -A INPUT -s 51.222.168.137 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.222.168.137 drop

```

WAF Rules

```json

// Cloudflare WAF

{

"description": "Block 51.222.168.137 — IPDebrief risk score 40",

"action": "block",

"filter": {

"expression": "ip.src eq 51.222.168.137"

}

}

```

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## INTELLIGENCE NOTES

1. Ahrefs Association: DNS hostname indicates proxy infrastructure for Ahrefs, a legitimate SEO tools company. However, the geolocation discrepancy and subnet abuse density suggest the IP may be repurposed for proxy services.

2. Subnet Context: The /24 block shows 78% abuse density. This IP should be treated as part of a potentially compromised subnet environment.

3. Monitoring Priority: Moderate. While not actively malicious, the IP warrants continued monitoring due to subnet-level abuse patterns and geolocation spoofing.

4. Action Threshold: Current risk score (40) suggests blocking is defensible but should be combined with additional signals before enforcement.

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*Intelligence generated via IPDebrief® platform. Data accuracy subject to continuous verification.*

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