51.161.65.175📋 Copy

# IP Intelligence Briefing: 51.161.65.175

## Executive Summary

IP 51.161.65.175 is a cloud infrastructure endpoint operated by OVH under Ahrefs Pte Ltd (ASN 16276). The IP exhibits moderate risk (score 40) with geolocation validation anomalies and operates within a high-abuse-density subnet. No active threat indicators or blacklist entries were observed.

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## Infrastructure Profile

Ownership & Registration:

• Organization: Ahrefs Pte Ltd
• ASN: 16276 (OVH)
• CIDR Block: 51.161.65.0/24
• Infrastructure Type: Cloud Compute (OVH)
• Network Classification: Hosting/Cloud Infrastructure

DNS Resolution:

• PTR Hostname: proxy-ca011-san175.ahrefs.net
• Domain: ahrefs.net
• Forward Resolution: Confirmed (1 hostname)
• Email Authentication: No SPF, DMARC, or TXT records detected

Service Status:

• Open Ports: None detected
• Service State: Firewalled / No Services
• TLS Certificate: None

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## Geolocation Analysis

Reported Location: Singapore (3000km accuracy radius)

Validation Status: INVALID

Geolocation Anomalies:

• Geolocation consensus marked as plausible: false
• RTT violation: Observed 30ms vs. minimum possible 121.6ms for 6082km claimed distance
• Probe count: 5 probes from multiple sources
• Inferred location discrepancy indicates geolocation spoofing or inaccurate provider data

Conclusion: The claimed Singapore location is geographically implausible. The actual physical location likely differs significantly, suggesting either data manipulation or provider reporting errors.

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## Subnet Abuse Assessment

Subnet: 51.161.65.0/24

Abuse Density: 0.7383 (High Abuse)

Classification: high_abuse

Statistics:

• Total Siblings: 256
• Active Siblings: 213
• Threat Siblings: 189
• Risk Inheritance: 29

Risk Distribution in /24:

• High Risk: 0
• Medium Risk: 100
• Low Risk: 0

Assessment: The /24 subnet exhibits elevated abuse activity with 73.83% abuse density. This context suggests the IP may be part of a larger infrastructure shared by multiple tenants, with a significant portion of sibling IPs flagged for abuse.

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## Threat Intelligence Status

Threat Indicators:

• Known Attacker: No
• Tor Exit Node: No
• Spam Source: No
• Blacklist Count: 0
• Threat Feeds: None detected
• Known Campaigns: None

Campaign Correlation:

• Campaign Likelihood: None
• Cert Matches: 0
• Banner Matches: 0
• Correlated IPs: 0

Risk Metrics:

• Overall Risk Score: 40 (Moderate)
• Provider Score: 0
• Authority Score: 0
• Stability Score: 0

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## Historical Observations (21 Total)

Temporal Stability:

• Ownership Changes: 0
• Threat Persistence Days: 0
• Is Persistently Malicious: No
• Threat Observation Count: 1

Consistent Signals:

• Provider consistently reported as OVH
• Cloud infrastructure characteristics maintained
• No significant behavioral changes observed

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## Recommended Actions

For SOC/SIEM Teams:

1. Monitor for Anomalies: Despite no current threat indicators, monitor for unusual traffic patterns given the high-abuse subnet context

2. Geolocation Verification: Do not trust reported Singapore location; verify actual endpoint location through additional means

3. Contextual Awareness: Recognize this IP as part of Ahrefs cloud infrastructure, a legitimate SEO tool provider

4. Threshold Consideration: Moderate risk score (40) warrants monitoring but not immediate blocking

Firewall Recommendations:

• No immediate block required
• Consider allowing established traffic patterns
• Monitor for unusual outbound connections from this IP

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## Conclusion

IP 51.161.65.175 is a legitimate cloud infrastructure endpoint operated by Ahrefs through OVH. The primary concerns are geolocation validation failures and the high-abuse density of the hosting /24 subnet. No active malicious activity or threat indicators were detected. The IP should be treated with contextual awareness—allowing legitimate Ahrefs services while monitoring for anomalies consistent with the broader subnet abuse patterns.

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