51.89.129.38📋 Copy

# IP Intelligence Briefing: 51.89.129.38/32

Classification: Moderate Risk | Risk Score: 40 | Status: Active Monitoring

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## Executive Summary

IP 51.89.129.38 is an OVH-hosted cloud infrastructure address (ASN 16276) associated with Ahrefs Pte Ltd, resolving to hostname proxy-uk008-san38.ahrefs.net. While the IP itself shows moderate risk characteristics, the assigned subnet 51.89.129.0/24 exhibits high abuse density (0.7695) with 197 of 206 active sibling IPs classified as threats. No open ports or active services were observed.

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## Ownership & Infrastructure

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## Risk Assessment

Current Risk Score: 40 (Moderate)

Key Indicators:

• Abuse Density: 0.7695 (High) — Subnet 51.89.129.0/24
• Threat Ratio: 95.6% (197 of 206 active siblings flagged as threats)
• Blacklist Status: Not listed on major threat feeds
• Known Attacker: False
• Spam Source: False
• Tor Exit/Proxy: False

Network Role: Firewalled / No Services — No open ports detected; infrastructure appears properly secured at host level.

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## Historical Observations

Total signals observed: 22

Recent activity concentrated on 2026-06-21, with sequential observations of:

• Subnet abuse density classification (signal confidence 0.75)
• Geolocation inference (London, GB; confidence 0.28)
• Provider classification (OVH; confidence 0.85)
• DNS resolution (ahrefs.net; confidence 0.80)

Threat Persistence: 0 days — No persistent malicious behavior detected.

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## Related Infrastructure

Relationship Graph: 36 relationships identified, primarily Same Network associations to OVH_282347344 network segment.

Subnet Analysis (51.89.129.0/24):

• Total IPs: 256
• Active IPs: 206
• Threat IPs: 197
• Medium Risk: 11 IPs
• Low Risk: 89 IPs

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## Recommended Actions

Firewall Rules:

```bash

# iptables

iptables -A INPUT -s 51.89.129.38 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.89.129.38 drop

# nginx

deny 51.89.129.38;

# pfSense

51.89.129.38/32

# Cloudflare WAF

{"description":"Block 51.89.129.38 — IPDebrief risk score 40","action":"block"}

# AWS WAF

{"Addresses":["51.89.129.38/32"],"Description":"IPDebrief risk 40"}

```

Analysis Notes:

• Block individual IP if observed in malicious traffic
• Consider subnet-level monitoring (51.89.129.0/24) due to high abuse density
• Legitimate Ahrefs infrastructure — verify traffic patterns before broad blocking
• No active services detected; firewall rules serve as prevention layer

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## Threat Context

This IP resides in an OVH cloud hosting environment with a documented abuse pattern in the /24 subnet. The combination of legitimate organizational ownership (Ahrefs) with high neighborhood abuse suggests infrastructure sharing or adjacent network contamination. Monitor for lateral movement or compromised neighbor IPs.

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