51.161.65.112📋 Copy

# INTELLIGENCE BRIEFING: 51.161.65.112/32

Classification: Moderate Risk | Risk Score: 40 | Generated: 2026-06-20

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## EXECUTIVE SUMMARY

IP 51.161.65.112 is a cloud infrastructure address hosted on OVH in Montreal, Canada, associated with the ahrefs.net domain. The IP presents moderate risk (40/100) with no direct threat indicators observed. However, the subnet 51.161.65.0/24 exhibits high abuse density (0.75), with 192 of 256 total siblings flagged as threats. Geolocation data shows validation inconsistencies requiring contextual assessment.

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## OWNERSHIP & NETWORK ATTRIBUTES

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## DNS & SERVICE PROFILE

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## THREAT INDICATORS

Assessment: No active threat indicators detected. The IP is associated with a legitimate web hosting domain (ahrefs.net) but operates in a high-abuse subnet environment.

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## NEIGHBORHOOD ANALYSIS

Neighborhood Risk Distribution: All sampled neighbors show identical risk profiles (risk score: 40, authority score: 50). This indicates systematic provisioning patterns rather than isolated malicious activity.

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## OBSERVATION HISTORY (23 OBSERVATIONS)

Recent signals indicate:

• Abuse density classification: Consistently reported as "high_abuse" with 0.75 density
• ASN allocation: Stable since 2001-02-15 (registry: RIPE)
• BGP routing: Stable via AS34549 → AS16276
• DNS records: Consistent ahrefs.net presence
• No ownership changes recorded during observation window

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## GEOLOCATION VALIDATION

Alert: Geolocation data shows physical impossibility.

Assessment: The 25ms RTT contradicts the 6082km distance to Canada. This suggests either incorrect geolocation data or the IP is being proxied through a different location. Contextual analysis recommended.

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## SECURITY ACTIONS & RECOMMENDATIONS

Risk-Based Action: Block recommended for defensive posture due to high-abuse subnet classification.

Firewall Rules:

```bash

# iptables

iptables -A INPUT -s 51.161.65.112 -j DROP

# nftables

nft add rule inet filter input ip saddr 51.161.65.112 drop

# NGINX

deny 51.161.65.112;

# pfSense

51.161.65.112/32

# Cloudflare WAF

Block IP 51.161.65.112 — risk score 40

# AWS WAF

Block CIDR 51.161.65.112/32

```

Recommendation: Block this IP and implement subnet-level blocking for 51.161.65.0/24 given the 0.75 abuse density. Monitor for legitimate ahrefs.net traffic patterns to avoid false positives.

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## INTELLIGENCE CONCLUSIONS

1. Primary Risk Factor: Subnet-level abuse density (0.75) with 192 threat-sibling IPs

2. Threat Status: No direct malicious indicators on this specific IP

3. Contextual Warning: Geolocation validation failure indicates potential data manipulation or proxy usage

4. Infrastructure: Cloud hosting environment with firewalled service profile

5. Action Priority: Moderate — subnet-level blocking advised with whitelist exceptions for legitimate ahrefs.net domains

Final Assessment: This IP represents a defensive security concern due to its high-abuse neighborhood environment. Implement

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Final Assessment: This IP represents a defensive security concern due to its high-abuse neighborhood environment. Implement subnet-level blocking for 51.161.65.0/24 with whitelist exceptions for verified ahrefs.net service traffic to balance security and operational continuity.

Intelligence Confidence: Moderate — based on neighborhood correlation and geolocation validation discrepancies.

Next Actions: Monitor for pattern escalation; review any blocked traffic logs for legitimate service access attempts.

Status: Active | Last Updated: 2026-06-20T20:46:49+00:00

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*End of Intelligence Briefing*

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