54.39.203.138📋 Copy

# IP Intelligence Briefing: 54.39.203.138

Classification: Moderate Risk Cloud Infrastructure IP

Date: Current Analysis Cycle

Source: IPDebrief Threat Intelligence Platform

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## Executive Summary

IP address 54.39.203.138 is a cloud compute address hosted on OVH infrastructure in Canada. The IP is associated with the legitimate domain ahrefs.net but exhibits geolocation inconsistencies and operates within a high-abuse-density subnet. Risk assessment yields a moderate score of 40/100 with no active threat indicators currently registered.

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## Ownership & Network Context

• Organization: Dmytro, Ahrefs Pte Ltd (OVH customer)
• ASN: 16276
• CIDR Block: 54.39.203.0/24
• Infrastructure Type: CloudCompute (OVH hosting)
• Network Role: Firewalled / No Services Detected

The IP resolves to PTR hostname `proxy-ca008-san138.ahrefs.net`, indicating association with the Ahrefs search engine marketing platform infrastructure.

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## Risk Assessment

Threat Indicators:

• No known attacker reputation
• Not a Tor exit node
• No spam source classification
• Zero blacklist hits
• No associated threat campaigns

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## Geolocation & Validation

• Reported Location: Beauharnois, Quebec, Canada
• Geolocation Consensus: Validated across 1 source
• RTT Validation: VIOLATION DETECTED

- Observed RTT: 26ms

- Minimum Possible RTT: 112.6ms (5628km distance)

- Implication: Reported geolocation is implausible; IP may be misreported or using proxy infrastructure

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## Neighborhood Analysis

Subnet 54.39.203.0/24 exhibits elevated abuse characteristics:

• Abuse Density: 0.5664 (56.64%)
• Subnet Classification: High Abuse
• Total Siblings: 256 IPs
• Active Siblings: 195
• Threat Siblings: 145
• Risk Distribution: 59 medium, 41 low, 0 high

This subnet shows significant abuse prevalence, suggesting the IP may be sharing infrastructure with other compromised or misconfigured hosts.

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## DNS & Email Reputation

• Resolved Hostname: proxy-ca008-san138.ahrefs.net
• Domain: ahrefs.net
• Forward Resolution: Confirmed (1 hostname)
• Email Authentication: Not configured

- SPF: Not present

- DMARC: Not present

- TXT Records: 0

---

## Historical Signals (Last 21 Observations)

Recent signals indicate stable, non-malicious activity:

• Latest (2026-06-28): DNS resolution confirmed for ahrefs.net
• Operator Label: Minimal (0.2174)
• Threat Persistence: 0 days
• Ownership Changes: 0
• Threat Observation Count: 0

No temporal pattern suggests the IP is becoming more or less risky.

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## Related Entities

DNS Associations: 16 related hostname entries all pointing to `proxy-ca008-san138.ahrefs.net`

Network Associations: Multiple references to OVH-CUST-281059687 network block

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## Recommended Security Actions

Despite moderate risk classification, no active threat indicators warrant aggressive blocking. However, the subnet context and geolocation implausibility suggest cautious monitoring.

Recommended Firewall Rules:

```bash

# iptables

iptables -A INPUT -s 54.39.203.138 -j DROP

# nftables

nft add rule inet filter input ip saddr 54.39.203.138 drop

# nginx

deny 54.39.203.138;

# pfSense

54.39.203.138/32

```

Cloud Provider Recommendations:

• Cloudflare WAF: Block with expression `ip.src eq 54.39.203.138`
• AWS WAF: Configure rule for `54.39.203.138/32`

Note: These recommendations are probabilistic and should be combined with other signals before implementation.

---

## Intelligence Conclusion

IP 54.39.203.138 represents cloud infrastructure associated with legitimate marketing services (ahrefs.net) but operates within a high-abuse subnet and displays geolocation inconsistencies. Current threat indicators are absent, suggesting the IP is not actively malicious. However, the neighborhood context warrants:

1. Monitoring: Track for emerging threat patterns

2. Verification: Confirm if this IP should legitimately receive traffic on target systems

3. Policy Consideration: Evaluate subnet-level blocking policies for 54.39.203.0/24

The moderate risk score and lack of active threat indicators support a watchlist approach rather than immediate blocking, unless specific traffic patterns or organizational policies require otherwise.

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