51.222.168.203📋 Copy

INTELLIGENCE BRIEFING: 51.222.168.203

Classification: Moderate Risk / Cloud Infrastructure

Date: 2026-06-15

Analyst: IPDebrief Intelligence Team

---

EXECUTIVE SUMMARY

IP 51.222.168.203 is a cloud compute endpoint operated by OVH (ASN 16276) under the organization "Dmytro, Ahrefs Pte Ltd" within customer network OVH-CUST-281059697. The IP demonstrates a risk score of 40 (moderate risk) and operates within a /24 subnet classified as high abuse with a density score of 0.7773. No active threat indicators, known campaigns, or malicious activity signatures were detected. However, the subnet shows elevated neighbor risk distribution with 100 medium-risk siblings out of 222 active addresses.

---

OWNERSHIP & INFRASTRUCTURE

The endpoint is associated with the Ahrefs.net domain infrastructure, indicated by PTR hostname "proxy-ca018-san203.ahrefs.net". DNS resolution confirms forward hostname matching to the same Ahrefs domain.

---

THREAT ASSESSMENT

Current Risk Profile:

• Risk Score: 40/100 (Moderate Risk)
• Abuse Confidence Score: Not Available
• Blacklist Count: 0
• DNSBL Listings: 1/8 total lists
• Known Attacker Status: False
• Spam Source Status: False
• Tor Exit Status: False

Control Plane Analysis:

• Operator Score: 0.2174 (Minimal)
• Route Stability: False (not route stable)
• DNSSEC Valid: Yes
• RPKI State: Not Available
• Route Changes (30d): 0

No active threat indicators, known campaigns, or malware signatures detected. The IP is not identified as a proxy, CDN, VPN, or residential endpoint.

---

GEOLOCATION DISCREPANCY WARNING

Reported Location: Canada (CA), Quebec

Reported City: Singapore

Measured RTT: 26-27.6ms

Geometric Distance: 5597.9 km

Minimum Expected RTT: 112ms

The reported geolocation contradicts network measurements. The RTT of 26ms is incompatible with a 5598 km distance, indicating potential geolocation spoofing or data inconsistency. This discrepancy should be factored into trust assessments.

---

NEIGHBORHOOD ANALYSIS

Subnet: 51.222.168.0/24

• Total Siblings: 256
• Active Siblings: 222
• Threat Siblings: 199
• Abuse Density: 0.7773 (High)
• Inherited Risk Score: 31

Neighbor Risk Distribution:

• High Risk: 0
• Medium Risk: 100 (100%)
• Low Risk: 0

The /24 subnet exhibits consistent medium-risk classification across all sampled neighbors, suggesting this is a shared cloud hosting environment with elevated baseline risk. 199 of 222 active siblings are classified as threats.

---

OBSERVATION HISTORY

Total Observations: 21

Recent Activity: 2026-06-15

Threat Persistence Days: 0

Persistently Malicious: False

Recent signals include subnet abuse classification and control plane observations. No evidence of persistent malicious behavior or ownership changes detected.

---

RECOMMENDED ACTIONS

Risk-Based Recommendations:

No specific recommendations generated based on current risk profile.

Firewall Rules:

```bash

# iptables

iptables -A INPUT -s 51.222.168.203 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.222.168.203 drop

# nginx

deny 51.222.168.203;

# pfSense

51.222.168.203/32

# Cloudflare WAF

{"description":"Block 51.222.168.203 — IPDebrief risk score 40","action":"block","filter":{"expression":"ip.src eq 51.222.168.203"}}

# AWS WAF

{"Addresses":["51.222.168.203/32"],"Description":"IPDebrief risk 40"}

```

---

INTELLIGENCE NARRATIVE

This IP address represents a cloud compute endpoint within OVH's infrastructure, associated with Ahrefs.net hosting services. The moderate risk classification (40/100) combined with the high-abuse neighborhood environment suggests this IP may be part of a shared hosting arrangement where multiple tenants operate from the same /24 block.

Key observations:

• No active malicious indicators or threat signatures detected
• One DNSBL listing present but no confirmed abuse confidence
• Geolocation data shows significant inconsistencies requiring validation
• Subnet demonstrates consistent medium-risk classification across all neighbors

The absence of persistent malicious behavior, combined with the lack of known campaigns and threat indicators, indicates this IP is likely legitimate cloud infrastructure. However, the elevated neighborhood risk density warrants monitoring if this IP begins exhibiting suspicious behavior patterns.

Recommendation: Maintain current security posture. Consider implementing rate limiting or connection monitoring for this IP if used for inbound services. No immediate blocking required absent additional suspicious activity signals.

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