51.195.183.163📋 Copy

# IP Intelligence Briefing: 51.195.183.163/32

Classification: Moderate Risk

Date: 2026-06-20

Analyst: IPDebrief Intelligence

## Executive Summary

IP 51.195.183.163 is a cloud compute infrastructure endpoint operated by OVH (ASN 16276) and registered to Ahrefs Pte Ltd. The IP exhibits a moderate risk profile (Score: 40) with geolocation consistent with London, England. While the IP itself shows no active threat indicators, the hosting subnet demonstrates elevated abuse density requiring heightened monitoring.

## Infrastructure Profile

## Threat Assessment

Positive Indicators

• No known malicious activity or threat campaigns
• Zero blacklist entries across major threat feeds
• Not identified as Tor exit node, VPN, or proxy service
• DNSSEC valid with CAA records present
• Legitimate association with Ahrefs domain

Risk Factors

• High Subnet Abuse Density: 0.6367 (63.67% abuse rate in /24)
• Threat Siblings: 163 of 256 IPs in subnet flagged as threats
• Operator Risk Score: 0.2174 (Minimal, but context matters)
• DNSBL Listed: 1 of 8 total lists

## Neighborhood Analysis

The /24 subnet 51.195.183.0/24 contains 256 sibling IPs with the following distribution:

• High Risk: 0 IPs
• Medium Risk: 11 IPs
• Low Risk: 89 IPs
• Abuse Density: 0.6367 (High)

This concentration of threats in the subnet suggests potential customer compromise or shared infrastructure abuse. The inherited risk score of 25 indicates contextual risk elevation despite the individual IP's moderate profile.

## Observed Behavior

Recent network signals (June 2026) confirm:

• Consistent geolocation to London, GB with 96.4ms average RTT
• No service exposure or port scanning activity
• Stable ownership pattern with no recent changes
• DNS resolution to Ahrefs infrastructure confirmed

## Recommended Actions

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

Immediate

• Monitor traffic from 51.195.183.163 for anomalous patterns
• Review inbound/outbound connections against threat intelligence

Firewall Rules (If blocking required)

```bash

iptables: iptables -A INPUT -s 51.195.183.163 -j DROP

nftables: nft add rule inet filter input ip saddr 51.195.183.163 drop

Cloudflare WAF: Block IP 51.195.183.163 (risk score 40)

AWS WAF: Add 51.195.183.163/32 to blocklist

```

Strategic Considerations

1. Legitimate Use Case: IP is registered to Ahrefs, a legitimate SEO analytics company. Blocking may disrupt legitimate operations.

2. Subnet Context: The high abuse density in the subnet warrants monitoring of other IPs in 51.195.183.0/24.

3. Threat Persistence: No persistent malicious behavior observed.

## Conclusion

IP 51.195.183.163 presents a moderate risk profile with legitimate enterprise association to Ahrefs. While the individual IP shows no active threats, the hosting environment exhibits elevated abuse density. Recommended approach: monitor rather than block, and consider subnet-level analysis if threat correlation with other IPs in 51.195.183.0/24 warrants investigation.

Priority: Medium

Action: Monitor with enhanced logging

Review Period: 30 days

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