51.195.244.239📋 Copy

INTEL BRIEFING: 51.195.244.239/32

Classification: Moderate Risk (Risk Score: 40)

Classification Date: 2026-06-20

Provider: OVH (ASN: 16276)

Organization: Ahrefs Pte Ltd Dmytro

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**Executive Summary**

IP 51.195.244.239 is a cloud hosting infrastructure address operating within the OVH network in London, GB. The IP resolves to a proxy hostname associated with ahrefs.net and exhibits moderate-risk characteristics. While no direct malicious activity was observed, the IP operates within a subnet characterized by high abuse density (0.8281), with 212 of 256 sibling IPs flagged as threats.

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**Technical Profile**

Geolocation: London, England, GB (92ms avg RTT from probe location)

Network Classification: CloudCompute / Hosting

Infrastructure Type: Cloud (OVH infrastructure)

DNS Resolution: proxy-uk000-san239.ahrefs.net

Services: No open ports detected (Firewalled / No Services)

DNSBL Status: Listed on 1 of 8 monitored blacklists

Risk Indicators:

• Risk Score: 40/100 (Moderate)
• Operator Score: 0.2174 (Minimal)
• BGP Prefix: 51.195.0.0/16
• Route Stability: Unstable (false)
• DNSSEC Valid: true

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**Neighborhood Analysis**

The IP resides in subnet 51.195.244.0/24, which presents elevated risk due to high abuse density:

Risk Assessment: The subnet exhibits concentrated abuse activity with 82.8% abuse density. While the target IP itself shows moderate risk, contextual risk is elevated due to neighbor relationships.

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**Observation History**

21 total observations recorded with recent signals including:

• High abuse density classification (0.8281)
• DNS resolution to ahrefs.net (80% confidence)
• Geographic inference: GB (28% confidence)
• DNSBL listings detected with high severity categories

No persistent malicious behavior patterns observed over the observation window.

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**Relationship Graph**

53 total relationships identified, primarily same-network relationships to OVH_282347336 network. No direct associations to known malicious entities or campaigns.

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**Recommended Security Actions**

Block Recommendation: The IP should be blocked at the perimeter based on risk profile and neighborhood context.

Firewall Rules:

• iptables: `iptables -A INPUT -s 51.195.244.239 -j DROP`
• nftables: `nft add rule inet filter input ip saddr 51.195.244.239 drop`
• nginx: `deny 51.195.244.239;`
• pfSense: `51.195.244.239/32`
• Cloudflare WAF: Block (risk score 40)
• AWS WAF: Block (51.195.244.239/32)

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**SOC Analyst Notes**

1. Contextual Risk: While individual risk score is moderate (40), the subnet-level abuse density (0.8281) warrants attention. Monitor for lateral activity from neighboring IPs.

2. Legitimate Use Case: The IP resolves to ahrefs.net, a legitimate SEO analytics provider. This may be a legitimate hosting address.

3. Blocking Consideration: Recommended block based on:

- DNSBL listing presence

- High-abuse neighborhood context

- Cloud hosting infrastructure (commonly abused for proxying)

4. Monitoring: If allowing traffic, monitor for:

- Unusual connection patterns

- Requests to sensitive endpoints

- Anomalous traffic volumes

5. Subnet Consideration: The /24 subnet shows 212 threat siblings. Consider evaluating blocklist strategy at the /16 level (51.195.0.0/16) if threat volume warrants.

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End of Briefing

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