51.161.37.107📋 Copy

# IP Intelligence Briefing: 51.161.37.107/32

Classification: Moderate Risk Hosting Infrastructure

Date: Current Analysis

Risk Score: 40/100

Analyst Notes: This IP requires monitoring due to elevated neighborhood abuse density despite moderate individual risk scoring.

---

## Executive Summary

IP address 51.161.37.107 is a moderate-risk (40) hosting infrastructure endpoint associated with OVH hoster OVH-CUST-281059684 under organization "Dmytro, Ahrefs Pte Ltd" (ASN 16276). The endpoint is currently firewalled with no open services. The parent /24 subnet exhibits high abuse density (0.7383) with 189 of 256 total IPs classified as threat siblings, indicating coordinated hosting abuse patterns in this network block.

---

## Technical Profile

Ownership & Routing:

• Organization: Dmytro, Ahrefs Pte Ltd
• ASN: 16276 (OVH)
• Network Block: 51.161.37.0/24
• BGP Prefix: 51.161.0.0/17
• AS Path: 34549 → 16276
• Route Stability: Stable (0 route changes in 30 days)
• RIR Registry: RIPE

Service Classification:

• Infrastructure Type: Hosting
• Open Ports: None (firewalled)
• CDN/Proxy/Vpn/Tor: Not detected

DNS Resolution:

• PTR Hostname: proxy-ca005-san107.ahrefs.net
• Domain: ahrefs.net
• Forward Resolution: Unconfirmed

Geolocation Anomalies:

• Reported Country: CA (Canada)
• Reported City: Singapore
• Distance/RTT Discrepancy: 6082 km distance with 28ms RTT violates minimum possible RTT of 121.6ms for that distance. This geographic inconsistency suggests potential data spoofing or measurement error requiring validation.

---

## Threat Indicators

Current Threat Profile:

• Known Attacker: No
• Tor Exit Node: No
• Spam Source: No
• Blacklist Count: 0
• DNSBL Listings: 1 of 8 total lists
• Known Campaigns: None identified

Temporal Analysis:

• Threat Persistence: Not persistently malicious
• Threat Observation Count: 1
• Ownership Changes: 0 (stable)
• Total Historical Observations: 27

---

## Neighborhood Analysis

The parent subnet 51.161.37.0/24 demonstrates significant abuse activity:

• Abuse Density: 0.7383 (High)
• Total IPs: 256
• Active IPs: 205
• Threat IPs: 189
• Classification: High Abuse

Risk Distribution in Neighboring IPs:

• High Risk: 0
• Medium Risk: 99
• Low Risk: 1
• Inherited Risk Score: 29

This indicates the subnet is operating in a high-abuse environment, though the target IP (51.161.37.107) itself shows moderate individual risk scoring.

---

## Recommended Security Actions

Based on the IP's risk profile and neighborhood context, implement the following blocking measures:

Firewall Rules:

```bash

# iptables

iptables -A INPUT -s 51.161.37.107 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.161.37.107 drop

```

Web Application Protection:

```nginx

# nginx

deny 51.161.37.107;

```

Enterprise Security Platforms:

• pfSense: Block 51.161.37.107/32
• Cloudflare WAF: Configure block rule with expression `ip.src eq 51.161.37.107`
• AWS WAF: Add rule for addresses `51.161.37.107/32`

---

## Intelligence Assessment

This IP represents low immediate threat but warrants monitoring due to:

1. High-abuse density parent subnet requiring potential subnet-level blocking

2. Geolocation inconsistencies suggesting potential spoofing capability

3. Hosting infrastructure classification in a high-risk network block

Recommended Actions:

• Monitor for increased threat indicators
• Consider subnet-level filtering for 51.161.37.0/24 if abuse patterns escalate
• Validate geolocation data through additional triangulation
• Correlate with any observed attack patterns from related IPs in the same /24

Threat Level: Monitor - Low Immediate Risk but Elevated Contextual Risk

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