51.161.37.228📋 Copy

# IP Intelligence Briefing: 51.161.37.228

Classification: Moderate Risk Infrastructure | Date: Current Analysis

## Executive Summary

IP address 51.161.37.228 is a cloud-compute infrastructure address hosted by OVH in Montreal, Canada. The IP demonstrates moderate risk (score: 40) with no active threat indicators. However, the /24 subnet exhibits high abuse density (0.7383), with 189 of 256 sibling IPs flagged as threats. The IP is associated with Ahrefs.net infrastructure but shows no open services, indicating it is firewalled.

## Infrastructure Profile

• Organization: Dmytro, Ahrefs Pte Ltd
• ASN: 16276 (OVH)
• Netname: OVH-CUST-281059684
• CIDR Block: 51.161.37.0/24
• Infrastructure Type: CloudCompute / Hosting
• Geolocation: Montreal, QC, Canada (Note: RTT validation indicates potential geolocation inaccuracy)

## Threat Indicators

• Risk Score: 40 (Moderate)
• Blacklist Count: 0
• DNSBL Listings: 1 of 8 lists
• Tor Exit Node: No
• Known Attacker: No
• Spam Source: No
• Active Threat Campaigns: None

## Neighborhood Risk Assessment

The /24 subnet (51.161.37.0/24) shows elevated abuse characteristics:

• Abuse Density: 0.7383 (High)
• Total Siblings: 256
• Active Siblings: 205
• Threat Siblings: 189
• Inherited Risk Score: 29

Neighboring IPs in the subnet consistently show risk scores of 40, indicating systematic risk patterns across the cloud infrastructure.

## Technical Observations

• DNS PTR: proxy-ca005-san228.ahrefs.net
• Domain: ahrefs.net
• Open Ports: None detected
• Services: Firewalled / No Services
• TLS Certificate: None
• HTTP Response: None (firewalled)

## Historical Signals

Analysis of 23 historical observations reveals:

• Recent operator scores: 0.087–0.2174
• Consistent "Minimal" risk classification across recent observations
• No escalation in threat signals detected

## Recommended Security Actions

Based on risk profile, consider the following defensive measures:

Firewall Rules:

• iptables: `iptables -A INPUT -s 51.161.37.228 -j DROP`
• nftables: `nft add rule inet filter input ip saddr 51.161.37.228 drop`
• nginx: `deny 51.161.37.228;`
• pfSense: Block 51.161.37.228/32

WAF Recommendations:

• Cloudflare WAF: Block with expression `ip.src eq 51.161.37.228`
• AWS WAF: Add 51.161.37.228/32 to blocked addresses

## Analyst Notes

While this IP currently shows no active malicious behavior, its subnet exhibits high abuse density. Monitor for any service activation or reputation degradation. The geolocation data contains inconsistencies (27ms RTT vs. 121.6ms minimum for stated location), which may indicate proxy or misreported data.

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