51.89.129.236📋 Copy

# IP Intelligence Briefing: 51.89.129.236

Classification: Moderate Risk / Cloud Infrastructure

Report Date: 2026-06-20

Intel Confidence: Standard

## Executive Summary

IP 51.89.129.236 is a cloud-hosted infrastructure address operated by OVH (ASN 16276) in London, England. While the IP itself shows moderate risk (score: 40), it resides within a subnet exhibiting high abuse density (0.7422) with 190 out of 256 active siblings flagged as threats. The address is associated with the ahrefs.net domain infrastructure but presents no directly observed malicious activity.

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## Infrastructure Profile

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## Threat Assessment

Direct Indicators

• Known Attacker: No
• Spam Source: No
• Tor Exit Node: No
• Blacklist Count: 0
• Campaign Correlation: None observed

Subnet Context

The /24 subnet (51.89.129.0/24) exhibits concerning abuse patterns:

• Abuse Density: 0.7422 (high_abuse classification)
• Active Threat Siblings: 190 IPs
• Medium Risk Siblings: 65 IPs
• Low Risk Siblings: 35 IPs
• Inherited Risk: 29

This contextual data suggests the subnet is heavily utilized for hosting services, with a significant portion of addresses flagged for abuse.

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## Historical Observation Timeline

Recent observations (2026-06-20) indicate:

1. DNS Resolution: Confirmed ahrefs.net domain association

2. Operator Score: 0.2174 (Minimal operator-level risk)

3. DNSSEC: Valid

4. CAA Records: Present

5. Threat Persistence: 0 days (no persistent malicious activity detected)

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## Network Relationships

• Primary Network: OVH_282347344
• Relationship Count: 39
• Network Classification: Consistent with OVH cloud infrastructure
• BGP Prefix: 51.89.0.0/16

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## Recommended Security Actions

Based on risk profile and subnet abuse context, the following rules are recommended:

Firewall Rules

```bash

# iptables

iptables -A INPUT -s 51.89.129.236 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.89.129.236 drop

# nginx

deny 51.89.129.236;

```

Cloud Platform Integration

• Cloudflare WAF: Block IP 51.89.129.236
• AWS WAF: Add 51.89.129.236/32 to allow-list or block-list as appropriate

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## Intelligence Notes for SOC Analysts

1. Contextual Risk: While this specific IP shows no direct threat indicators, the high abuse density of its /24 subnet warrants cautious monitoring. The inherited risk score of 29 indicates neighboring addresses are frequently involved in abuse campaigns.

2. Legitimate Use Case: DNS records associate this IP with ahrefs.net, a legitimate SEO analytics platform. However, cloud hosting providers frequently abuse legitimate infrastructure.

3. Actionable Recommendation: Implement block rules at perimeter firewalls while maintaining logs for forensic analysis. Monitor for any changes in behavior patterns.

4. No Immediate Escalation: No active threat campaigns, no known malicious campaigns correlated, and no direct threat indicators observed.

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Status: Monitor/Block Pending Additional Context

Next Review: As needed based on network activity patterns

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