51.89.129.253📋 Copy

# IP Intelligence Briefing: 51.89.129.253/32

Classification: Moderate Risk / Cloud Infrastructure Host

Analysis Date: Current

Risk Score: 50/100

## Executive Summary

IP 51.89.129.253 is a cloud computing infrastructure address owned by Ahrefs Pte Ltd Dmytro, operating under OVH (ASN 16276). The IP resolves to London, England, and functions as a hosting provider with no active services detected. Despite a moderate individual risk score, the IP resides within a /24 subnet classified as high abuse density, necessitating contextual awareness.

## Ownership and Infrastructure

• Provider: OVH (ASN 16276, RIPE NCC)
• Organization: Ahrefs Pte Ltd Dmytro
• Location: London, England, GB
• Infrastructure Type: CloudCompute / Hosting
• Network Role: Firewalled / No Services
• BGP Prefix: 51.89.0.0/16
• Route Stability: Stable (no route changes in 30 days)

## DNS and Resolution

• PTR Hostname: proxy-uk008-san253.ahrefs.net
• Domain: ahrefs.net
• Forward Resolution: Unconfirmed
• Email Authentication: None (no SPF or DMARC records configured)
• DNSBL Status: Listed on 2 of 8 total blacklists

## Threat Assessment

Observed Threat Indicators:

• No known attack campaigns
• Not identified as a known attacker
• Not a spam source
• Not a Tor exit node
• No active blacklists with abuse indicators

Control Plane Observations:

• DNSBL Listed Count: 2
• Operator Score: 0.4348 (Basic)
• RPKI State: Not validated
• IRR Consistency: Not assessed

## Neighborhood Context

The /24 subnet (51.89.129.0/24) exhibits elevated abuse activity:

• Abuse Density: 0.668 (High Abuse Classification)
• Total Siblings: 256 IPs
• Active Siblings: 158
• Threat Siblings: 171
• Inherited Risk Score: 26/100

This contextual environment suggests the IP operates within a hosting segment with significant abuse potential, requiring network-level monitoring despite individual IP cleanliness.

## Historical Observations

Observation Count: 28 total signals

• Most recent: June 20, 2026
• Consistent classification as OVH cloud infrastructure
• Geographic validation confirmed (London location plausible, minimum RTT 84ms)
• No ownership changes recorded
• Threat persistence: 0 days (not persistently malicious)

## Relationship Graph

38 relationships detected, primarily to network identifiers (OVH_282347344). No certificate-based or hostname-based relationships observed.

## Recommended Actions

Blocking Rules (Probabilistic):

```bash

# iptables

iptables -A INPUT -s 51.89.129.253 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.89.129.253 drop

# nginx

deny 51.89.129.253;

# pfSense

51.89.129.253/32

# Cloudflare WAF

Block 51.89.129.253 — IPDebrief risk score 50

# AWS WAF

Addresses: ["51.89.129.253/32"]

Description: IPDebrief risk 50

```

## Analyst Assessment

The IP presents a moderate individual risk profile but operates within a high-abuse-density hosting environment. The combination of being a cloud hosting provider with no services running, zero known attacks, and 2 DNSBL listings suggests legitimate infrastructure with potential for policy-based abuse.

Recommendation: Monitor rather than block. The inherited risk from the subnet (26/100) is moderate. Consider implementing rate limiting or connection throttling for this subnet if traffic patterns suggest abuse, rather than outright blocking the individual IP.

Priority: Low-Medium

Action Required: Monitor subnet-level activity

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