54.39.136.53📋 Copy

# IP Intelligence Briefing: 54.39.136.53/32

Date: 2026-06-28

Classification: Moderate Risk (Score: 40/100)

Provider: OVH (ASN 16276)

## Executive Summary

IP 54.39.136.53 is a cloud hosting endpoint operated by OVH in Beauharnois, Quebec, Canada. The IP resolves to a DNS hostname (proxy-ca002-san53.ahrefs.net) associated with ahrefs.net infrastructure. No active open services or ports detected. The IP carries a moderate risk score (40) with elevated neighborhood abuse context. No known active threat indicators, campaign associations, or persistent malicious activity observed.

## Technical Profile

• Risk Score: 40 (Moderate)
• ASN: 16276 (OVH SAS)
• Organization: Dmytro, Ahrefs Pte Ltd
• CIDR Block: 54.39.136.0/24
• Location: Beauharnois, QC, CA (Geolocation disputed—RTT analysis indicates 5,629km distance with 31ms latency, suggesting geolocation mismatch)
• Network Type: Cloud/Hosting infrastructure
• DNS: ahrefs.net domain with forward resolution to proxy-ca002-san53.ahrefs.net
• Services: None detected (firewalled/no services)
• Threat Indicators: None identified
• Blacklist Status: Listed on 1 of 8 DNSBLs

## Neighborhood Analysis (54.39.136.0/24)

• Subnet Classification: High Abuse
• Abuse Density: 0.7031 (elevated)
• Total Siblings: 256
• Active Siblings: 184
• Threat Siblings: 180 (71% of active siblings flagged as threats)
• Inherited Risk Score: 28
• Risk Distribution: 27 medium-risk, 73 low-risk neighbors

## Observation History

20 historical observations recorded. Most recent signal (2026-06-28) confirms OVH cloud infrastructure classification. Previous observations (2026-06-20) indicate consistent geolocation signals with RTT validation violations. No ownership changes detected. No persistent malicious activity patterns observed over the observation window.

## Relationships

37 relationships identified, all pointing to OVH network (OVH-CUST-281059681). No external associations to other organizations, subnets, hostnames, or certificates beyond network containment.

## Recommended Actions

Based on risk profile and neighborhood context, defensive blocking is recommended:

• iptables: `iptables -A INPUT -s 54.39.136.53 -j DROP`
• nftables: `nft add rule inet filter input ip saddr 54.39.136.53 drop`
• nginx: `deny 54.39.136.53;`
• pfSense: Block 54.39.136.53/32
• Cloudflare WAF: Block expression `ip.src eq 54.39.136.53`
• AWS WAF: Address `54.39.136.53/32`

Note: Recommendations are probabilistic. Combine with additional signals before enforcement. The elevated neighborhood abuse density (180/184 active siblings flagged as threats) warrants consideration of broader subnet blocking policies if false-positive risk is acceptable.

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*Intel generated by IPDebrief. Validated against 20 historical observations.*

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