51.161.65.133📋 Copy

IP INTELLIGENCE BRIEFING: 51.161.65.133/32

Overview

IP address 51.161.65.133 is a moderate-risk (score: 40) cloud infrastructure endpoint associated with OVH SAS (AS16276) in Montreal, Quebec, Canada. The IP is registered under customer network OVH-CUST-281059690 and resolves to hostname proxy-ca011-san133.ahrefs.net, indicating association with the Ahrefs web analytics platform infrastructure.

Risk Assessment

The IP presents a moderate risk profile with an overall risk score of 40. Current threat indicators show no active abuse confidence, no known campaigns, and zero blacklist listings. However, the subnet environment presents elevated contextual risk: the /24 subnet (51.161.65.0/24) exhibits high-abuse classification with an abuse density score of 0.75, where 192 of 256 total sibling IPs are classified as threats. The inherited risk from subnet context is 30.

Technical Profile

• Infrastructure Type: CloudCompute/Hosting environment (OVH)
• DNS Resolution: proxy-ca011-san133.ahrefs.net (forward resolution confirmed)
• Network Services: No open ports detected; service classification as "Firewalled / No Services"
• Control Plane: Listed on 1 DNSBL list; BGP prefix 51.161.0.0/17; route stability flagged as unstable
• Geolocation: Montreal, QC, Canada (3000km accuracy radius)

Temporal Observations

23 historical observations recorded from June 21-29, 2026. The IP demonstrates consistent infrastructure classification (cloud/hosting) with no ownership changes. Threat observation count is 1, with no persistent malicious behavior patterns detected.

Related Entities

33 relationships identified, primarily network associations to OVH-CUST-281059690. All neighboring IPs in the /24 subnet show medium risk scores (40) with authority scores of 50, indicating coordinated infrastructure deployment rather than isolated malicious actors.

Recommended Actions

Given the moderate risk score and subnet-level abuse context, the following defensive measures are recommended:

```bash

# iptables

iptables -A INPUT -s 51.161.65.133 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.161.65.133 drop

# nginx

deny 51.161.65.133;

```

Additional blocking rules are available for pfSense, Cloudflare WAF, and AWS WAF.

Intelligence Note

This IP represents legitimate cloud infrastructure within a high-abuse-density subnet. The ahrefs.net hostname association suggests this may be a web proxy or analytics service endpoint. However, the subnet's 75% abuse density warrants defensive blocking in SOC environments. Monitor for any behavioral changes and maintain awareness of related IPs in the 51.161.65.0/24 range.

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