54.39.0.33📋 Copy

# IP INTELLIGENCE BRIEFING: 54.39.0.33/32

## EXECUTIVE SUMMARY

IP address 54.39.0.33 is a cloud infrastructure endpoint associated with OVH network infrastructure (ASN 16276) and the organization Ahrefs Pte Ltd. The address presents moderate risk (score: 50) with recent blacklist activity and operates within a subnet exhibiting high abuse density. Current observations indicate no active services, but the subnet's abuse classification warrants monitoring.

## OWNERSHIP AND INFRASTRUCTURE

• ASN: 16276 (OVH)
• Organization: Dmytro, Ahrefs Pte Ltd
• Network Block: 54.39.0.0/24
• Location: Beaucharnois, Quebec, Canada
• Infrastructure Type: CloudCompute (OVH hosting provider)
• CIDR Classification: 54.39.0.0/24

## DNS AND NAME RESOLUTION

• PTR Hostname: proxy-ca004-san33.ahrefs.net
• Forward Resolution: proxy-ca004-san33.ahrefs.net
• Hosted Domain: ahrefs.net
• Email Authentication: SPF and DMARC records not configured

## THREAT INDICATORS

• Risk Score: 50 (Moderate Risk)
• Abuse Confidence Score: Not available
• Blacklist Status: Listed on 8 threat intelligence feeds
• Known Attacker: No
• Spam Source: No
• Tor Exit Node: No
• Campaign Associations: None detected

## NETWORK CLASSIFICATION

• Service Status: Firewalled / No Services (no open ports detected)
• Cloud Infrastructure: Yes
• CDN: No
• VPN: No
• Proxy: No
• Hosting Provider: Yes

## SUBNET ANALYSIS (54.39.0.0/24)

The address operates within a subnet exhibiting elevated abuse metrics:

• Abuse Density: 0.6797 (High Abuse Classification)
• Inherited Risk: 27
• Total Subnet Siblings: 256
• Active Siblings: 166
• Threat Siblings: 174

Risk distribution across the subnet shows 100 medium-risk neighbors with no high-risk classifications. The subnet's abuse density correlates with the target IP's moderate risk classification.

## OBSERVATION HISTORY

Signal analysis over the observation period reveals:

• Total Observations: 20
• Most Recent Activity: June 20, 2026 (blacklist listings)
• Blacklist Severity: High
• Operator Score: 0.2174 (Minimal)
• Threat Persistence: Single observation, not persistently malicious
• Ownership Stability: No ownership changes recorded

## RECOMMENDED ACTIONS

Firewall and blocking recommendations based on risk profile:

iptables:

```

iptables -A INPUT -s 54.39.0.33 -j DROP

```

nftables:

```

nft add rule inet filter input ip saddr 54.39.0.33 drop

```

nginx:

```

deny 54.39.0.33;

```

pfSense:

```

54.39.0.33/32

```

Cloudflare WAF:

Block IP with expression: `ip.src eq 54.39.0.33`

AWS WAF:

Block address: `54.39.0.33/32`

## INTELLIGENCE NARRATIVE

The IP address 54.39.0.33 operates as a cloud infrastructure endpoint within OVH's 54.39.0.0/24 subnet. Current scanning indicates no active services, with the endpoint appearing firewalled. However, recent blacklist activity (8 listings as of June 20, 2026) combined with the subnet's high abuse density (0.6797) suggests this IP may be utilized for transient malicious activities. The DNS resolution to ahostname proxy-ca004-san33.ahrefs.net indicates association with Ahrefs infrastructure, though the lack of email authentication (no SPF/DMARC) is notable.

The neighborhood analysis reveals 174 threat-sibling addresses within the /24, indicating potential infrastructure sharing for various use cases. While the individual IP shows moderate rather than high risk, the contextual abuse indicators within the subnet support defensive blocking. No persistent malicious campaigns were identified, but the abuse confidence and blacklist presence warrant continued monitoring.

Recommended SOC Action: Implement blocking at perimeter firewalls. Monitor for activity resumption from this address or related subnet addresses. Consider geo-blocking if business requirements permit.

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