51.161.37.86📋 Copy

# IP INTELLIGENCE BRIEFING

Target: 51.161.37.86/32

Classification: Moderate Risk / Cloud Infrastructure

Date: Analysis generated based on IPDebrief intelligence

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## EXECUTIVE SUMMARY

IP 51.161.37.86 is a moderate-risk (risk score 40) cloud compute address hosted within OVH infrastructure. The IP is associated with Ahrefs Pte Ltd and resolves to ahrefs.net domain infrastructure. While no direct threat indicators were identified for this specific address, the subnet exhibits high abuse density (0.7422), indicating systemic risks in the /24 block.

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## PROFILE ASSESSMENT

Ownership & Provider:

• ASN: 16276 (OVH)
• Organization: Dmytro, Ahrefs Pte Ltd
• Network: OVH-CUST-281059684
• Infrastructure Type: Cloud Compute
• Classification: Firewalled / No Services Detected

Geolocation:

• Reported Country: CA (Canada)
• Geolocation Consensus: Inconsistent (coordinates suggest alternate location)
• Accuracy Radius: 3000km
• Status: GeoPlausible flag false

DNS Resolution:

• PTR Hostname: proxy-ca005-san86.ahrefs.net
• Forward Resolution: proxy-ca005-san86.ahrefs.net
• Domain: ahrefs.net
• Email Authentication: No SPF/DMARC records detected

Threat Indicators:

• Blacklist Count: 0
• Known Attacker: No
• Spam Source: No
• Tor Exit Node: No
• DNSBL Listed: 1 of 8 total lists
• Abuse Confidence Score: Not available

---

## OBSERVATION HISTORY

Signal Timeline: 18 total observations recorded

• Most Recent: 2026-06-15 15:40 UTC
• Observation Count: 1 (persistent malicious activity: No)
• Threat Persistence Days: 0

Key Historical Signals:

• 2026-06-15: Subnet abuse density recorded at 0.7422 (high_abuse classification), inherited risk score 29
• 2026-06-09: DNSBL listing detected (1 of 8 lists), max severity: high
• Routing: Route stability flag false, no route changes in 30 days

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## SUBNET NEIGHBORHOOD ANALYSIS

Subnet: 51.161.37.0/24

• Total Siblings: 256
• Active Siblings: 198
• Threat Siblings: 190
• Abuse Density: 0.7422 (HIGH)
• Subnet Classification: high_abuse

Risk Distribution:

• High Risk: 0
• Medium Risk: 99
• Low Risk: 1
• Inherited Risk: 29

Neighbor Assessment: All sampled neighbors (51.161.37.0-5) show identical risk profile (risk score: 40, authority score: 50), indicating consistent infrastructure behavior across the subnet.

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## NETWORK RELATIONSHIPS

Total Relationships: 32

• Primary Relationship Type: Same Network (OVH-CUST-281059684)
• Correlated IPs: 0
• Campaign Certificates: 0
• Banner Matches: 0

---

## THREAT CORRELATION

Campaign Likelihood: None

• Known Campaigns: None
• Threat Feeds: None
• Cert Matches: 0
• Correlated IPs: 0

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## RECOMMENDED SECURITY ACTIONS

Based on risk profile (score 40), the following blocking rules are recommended:

Firewall Rules:

```bash

# iptables

iptables -A INPUT -s 51.161.37.86 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.161.37.86 drop

# nginx

deny 51.161.37.86;

```

Cloud Security Platforms:

• Cloudflare WAF: Block with expression `ip.src eq 51.161.37.86`
• AWS WAF: Add address `51.161.37.86/32` to rule set
• pfSense: Add `51.161.37.86/32` to firewall block list

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## INTELLIGENCE NOTES

Risk Factors:

1. High abuse density in parent subnet (51.161.37.0/24) with 190 threat-sibling IPs

2. DNSBL listing detected (1 of 8 lists) with high severity

3. Geolocation inconsistencies between data sources

4. No direct threat indicators for this specific IP

Mitigating Factors:

1. No known campaigns or correlated IPs

2. No open ports or services detected

3. No direct threat indicators (not known attacker, not spam source)

Recommendation: Block at perimeter firewall level due to subnet-level abuse density. Monitor for any service activation or threat indicator emergence.

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*Report generated by IPDebrief Intelligence Platform*

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