51.222.168.220📋 Copy

# THREAT INTELLIGENCE BRIEFING

Target IP: 51.222.168.220/32

Classification: Moderate Risk / Hosting Infrastructure

Date: Current

Prepared For: SOC Analyst Team

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## EXECUTIVE SUMMARY

IP 51.222.168.220 is a moderate-risk (score 40/100) residential hosting endpoint operating within OVH's Canadian infrastructure. The IP resolves to the Ahrefs.net domain (proxy-ca018-san220.ahrefs.net) and is classified as hosting infrastructure with no active open services. While the endpoint itself shows no active malicious indicators, the /24 subnet demonstrates elevated abuse density (0.6875) with 176 of 256 sibling IPs flagged as threats.

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## TECHNICAL PROFILE

Ownership & Registration:

• ASN: 16276 (OVH SAS)
• Organization: Dmytro, Ahrefs Pte Ltd
• Network: OVH-CUST-281059697
• CIDR Block: 51.222.168.0/24
• RIR: ARIN

Geolocation:

• Country: Canada (CA)
• Region: Quebec (QC)
• Geo Sources: 3 (consensus: true, plausible: false)
• BGP Origin: 51.222.0.0/16 via AS34549

Infrastructure Classification:

• Service Type: Hosting
• Connection: Firewalled / No Services
• Open Ports: None detected
• TLS/HTTP Services: None active
• PTR Record: proxy-ca018-san220.ahrefs.net

DNS Reputation:

• Blacklist Listed: 1 of 8 total DNSBL lists
• No active DNSBL listings for the IP itself
• No email authentication records (SPF/DMARC: absent)

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## THREAT ASSESSMENT

Current Risk Level: Moderate (40/100)

Positive Indicators:

• No active threat indicators
• Not a known attacker, spam source, or Tor exit node
• No known campaign associations
• Route stability confirmed (no changes in 30 days)
• DNSSEC valid

Concerning Indicators:

• Subnet abuse density: 0.6875 (HIGH)
• 176 threat siblings in /24 subnet (68% threat ratio)
• 220 active siblings detected
• Single historical threat observation recorded

Neighborhood Analysis:

The 51.222.168.0/24 subnet shows consistent medium-risk classification across all 100 sampled neighbors. Risk scores uniformly at 40, indicating systematic infrastructure-level risk rather than isolated endpoint behavior.

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## OBSERVATION HISTORY

27 signal observations recorded. Key temporal patterns:

• Recent geolocation consistent (Canada/Quebec)
• Provider identification stable (OVH)
• Routing signals present with operator score 0.4783
• No persistent malicious behavior flagged

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## RELATIONSHIP MAPPING

36 relationships identified, predominantly same-network associations to OVH-CUST-281059697. No external organization or certificate relationships detected.

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## RECOMMENDED ACTIONS

1. Monitor: Treat as medium-priority traffic source. The subnet's high abuse density warrants heightened monitoring despite individual endpoint cleanliness.

2. Log Traffic: Implement logging for connections from this subnet to establish baseline behavior patterns.

3. Whitelist Consideration: The IP resolves to a legitimate domain (ahrefs.net), suggesting legitimate use. Consider whitelisting if traffic patterns are benign.

4. Subnet Context: Evaluate other IPs in the 51.222.168.0/24 subnet for coordinated activity, given the 68% threat sibling ratio.

5. No Immediate Blocking: Individual endpoint shows no active malicious indicators. Blocking may impact legitimate services.

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Analyst Notes: This endpoint appears to be part of legitimate Ahrefs hosting infrastructure operating from OVH Canada. However, the high neighborhood abuse density suggests this subnet is commonly used for various purposes, including potentially compromised endpoints. Monitor for anomalous behavior patterns rather than treating the IP as inherently malicious.

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