54.39.136.79📋 Copy

# IP Intelligence Briefing: 54.39.136.79/32

## Executive Summary

IP 54.39.136.79 is a cloud computing infrastructure address associated with OVH hosting in Canada. The IP carries a moderate risk score of 40 and resides within a subnet classified as high_abuse with 0.6953 abuse density. While the hostname indicates association with Ahrefs services, multiple DNS blacklist listings and the subnet's high threat sibling count warrant defensive monitoring.

## Ownership and Infrastructure

• Organization: Dmytro, Ahrefs Pte Ltd
• ASN: 16276 (OVH SAS)
• Netblock: 54.39.136.0/24
• Infrastructure Type: CloudCompute / Hosting
• Geolocation: Beauharnois, QC, Canada (CA)
• Service Status: Firewalled / No Services Detected

The IP resolves to proxy-ca002-san79.ahrefs.net with forward resolution confirmed. DNSSEC is valid with CAA records present.

## Threat Indicators

• Risk Score: 40 (Moderate Risk)
• DNSBL Listed: 1 of 8 blacklists
• Operator Score: 0.2174 (Minimal)
• Known Attacker: False
• Tor Exit: False
• Spam Source: False
• Campaign Correlation: 0

## Neighborhood Analysis

The parent subnet 54.39.136.0/24 exhibits elevated abuse characteristics:

• Abuse Density: 0.6953 (high_abuse classification)
• Total Siblings: 256
• Active Siblings: 184
• Threat Siblings: 178
• Inherited Risk: 27

Risk distribution across neighbor analysis shows 47 medium-risk and 53 low-risk neighbors with no high-risk classifications in the sampled set. This indicates a mixed-use cloud environment with significant abuse activity.

## Observation History

Total of 19 historical observations recorded. Recent signals include:

• 2026-06-28: Geolocation signals from Canada with confidence 0.18 (Cymru) and 0.75 (AlienVault OTX)
• 2026-06-20: Subnet abuse density signals confirming high_abuse classification

The IP shows single threat observation with 0 threat persistence days. No persistent malicious activity pattern detected.

## Recommended Security Actions

Firewall Rules

```bash

# iptables

iptables -A INPUT -s 54.39.136.79 -j DROP

# nftables

nft add rule inet filter input ip saddr 54.39.136.79 drop

# nginx

deny 54.39.136.79;

# pfSense

54.39.136.79/32

# Cloudflare WAF

ip.src eq 54.39.136.79

# AWS WAF

Addresses: ["54.39.136.79/32"]

```

## Intelligence Assessment

The IP addresses legitimate web hosting infrastructure (Ahrefs) but operates within an OVH cloud environment with documented high abuse density. The moderate risk score reflects the subnet context rather than direct malicious activity on this specific address. However, the presence of DNS blacklist listings combined with the neighborhood's 178 threat siblings suggests elevated risk.

Recommended Action: Implement block at perimeter firewall or WAF. Monitor for any service activation or port opening patterns. The subnet's high abuse density warrants continued surveillance of adjacent IP ranges.

Confidence Level: Moderate — based on subnet-level threat indicators and DNS blacklist evidence.

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