51.161.65.34📋 Copy

# IP Intelligence Briefing: 51.161.65.34/32

## Executive Summary

IP 51.161.65.34 is hosted on OVH infrastructure under organization "Dmytro, Ahrefs Pte Ltd" (ASN 16276). The IP exhibits a moderate risk profile (score: 40) within a high-abuse density subnet (51.161.65.0/24), which contains 178 threat-sibling IPs out of 209 active addresses. No active threat indicators detected, but the subnet context warrants defensive monitoring.

## Technical Profile

Ownership & Classification:

• ASN: 16276 (OVH)
• Organization: Dmytro, Ahrefs Pte Ltd
• Netname: OVH-CUST-281059690
• Infrastructure Type: CloudCompute / Hosting
• CIDR Block: 51.161.65.0/24

Geolocation:

• Country: Canada (CA)
• City: Singapore
• Accuracy Radius: 3000 km
• Note: Geolocation consensus confirmed across multiple sources, though coordinates appear inconsistent with stated country

Network Services:

• Open Ports: None detected
• DNS PTR: proxy-ca011-san34.ahrefs.net
• Forward Resolution: Confirmed for ahrefs.net domain
• No active services detected (firewalled/no services)

## Threat Assessment

Risk Indicators:

• Risk Score: 40 (Moderate Risk)
• Blacklist Count: 0
• DNSBL Listed: 1 of 8 total lists
• Tor Exit Node: No
• Known Attacker: No
• Spam Source: No
• Campaign Correlation: None detected

Subnet Risk Context:

• Abuse Density: 0.6953 (High)
• Threat Siblings: 178 out of 256 total IPs
• Inherited Risk Score: 27
• Classification: High Abuse
• 209 active sibling IPs in neighborhood

## Observational History

Timeline Analysis:

• Total Observations: 17 signals
• Most Recent: 2026-06-15T19:33:07
• Signal Types: Geolocation, subnet abuse, control plane, overall profile
• Threat Persistence: 0 days
• Ownership Changes: 0

Geolocation Consistency:

• Historical data shows inconsistent geolocation reporting (CA country code with varying coordinates)
• No persistent malicious activity detected over observation period

## Relationship Graph

Entity Links:

• 32 relationships detected
• Primary: Same Network (OVH-CUST-281059690)
• No external hostname, organization, or certificate relationships identified
• No cross-ASN or cross-organization associations

## Recommended Security Actions

Firewall Rules:

• iptables: `iptables -A INPUT -s 51.161.65.34 -j DROP`
• nftables: `nft add rule inet filter input ip saddr 51.161.65.34 drop`
• nginx: `deny 51.161.65.34;`
• pfSense: `51.161.65.34/32`
• Cloudflare WAF: Block with expression `ip.src eq 51.161.65.34`
• AWS WAF: Address `51.161.65.34/32`

Operational Recommendations:

1. Monitor subnet 51.161.65.0/24 for correlated activity (178 threat siblings detected)

2. Consider blocking the entire /24 subnet given high abuse density (0.6953)

3. No immediate blocking required for single IP based on current risk profile

4. Review DNSBL listings for additional reputation context

## Analyst Notes

The IP exhibits low-risk characteristics individually but operates within a high-abuse subnet. The ahrefs.net domain association suggests legitimate web infrastructure, but the subnet environment requires enhanced scrutiny. No active exploitation or campaign indicators present. Defensive posture should focus on subnet-level monitoring rather than IP-specific blocking.

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