5.167.66.52📋 Copy

# IP Intelligence Briefing: 5.167.66.52/32

## Executive Summary

IP address 5.167.66.52 is classified as Moderate Risk (Risk Score: 49/100) and has been identified as a Known Attacker. The address is assigned to ER-Telecom Holding Cheboksary branch (ASN 57026) and operates from Cheboksary, Russian Federation. The IP shows presence on threat feed blocklist.de and demonstrates attacker behavior patterns.

## Technical Profile

Ownership & Network:

• ASN: 57026 (CHEB-AS - JSC ER-Telecom Holding, RU)
• Organization: Network Operation Center CJSC ER-Telecom Holding Cheboksary branch
• RIR: RIPE
• CIDR Block: 5.167.64.0/22 (origin BGP prefix: 5.167.64.0/20)
• Network Segment: ERT-H-CHEB-PPPOE-22-NET (residential PPPoE network)

Geolocation:

• Country: Russia (RU)
• Region: Chuvash Republic
• City: Cheboksary
• Location Accuracy: 5000 km radius (single source)

Network Classification:

• Connection Type: Residential
• Infrastructure Type: Residential
• Services: Firewalled / No Services (no open ports detected)
• CDN/Cloud/Proxy/VPN: Negative across all indicators

## Threat Indicators

Primary Indicators:

• Known Attacker: Confirmed
• Blacklist Presence: 1 entry (blocklist.de)
• DNSBL Lists: Listed on 1 of 8 DNSBLs
• Reputation Sources: Present (blocklist.de)

DNS Analysis:

• PTR Hostname: 5x167x66x52.dynamic.cheb.ertelecom.ru
• Forward Resolution: 1 hostname confirmed
• Email Authentication: SPF record present, DMARC status not detected

## Risk Assessment

Current Risk Score: 49/100 (Moderate)

Risk Components:

• Abuse Confidence: Data insufficient for precise scoring
• Stability: No ownership changes detected
• Threat Persistence: Single threat observation recorded
• Campaign Association: No active threat campaigns detected

Neighborhood Analysis (5.167.66.0/24):

• Total Sibling IPs: 256
• Active Siblings: 134
• Risk Distribution: 0 high-risk, 61 medium-risk, 39 low-risk
• Abuse Density: 0
• Inherited Subnet Risk: 40/100

Related IPs with Elevated Risk (Risk Score ≥ 49):

• 5.167.66.3: Risk Score 49, Authority Score 50
• 5.167.66.4: Risk Score 49, Authority Score 50

## Observation History

The IP has been observed 50 times with the following patterns:

• Most Recent: 2026-06-24 (multiple observations within same day)
• Consistent Indicators: ASN 57026, Russian geolocation, residential classification
• Operator Score: Minimal (0/8)
• Data Sufficiency: Moderate (6 of 6 dimensions covered in some observations)

Temporal Analysis:

• No persistent malicious behavior detected
• Threat observation count: 1
• Ownership changes: 0
• Threat persistence days: 0

## Network Relationships

Relationship Graph: 340 total relationships

• Primary Association: ERT-H-CHEB-PPPOE-22-NET (residential network segment)
• Network relationships indicate this IP is part of a large residential PPPoE subscriber pool
• No organizational or certificate relationships detected

## Recommended Actions

Firewall Rules:

• Block outbound connections from this IP if originating from internal network
• Implement rate limiting on inbound connections from this subnet
• Monitor for scanning activity from related IPs (5.167.66.3, 5.167.66.4)

Threat Intelligence Integration:

• Add to blocklist with justification: "Known attacker - Russian residential ISP"
• Monitor for correlation with other IPs from ASN 57026
• Track DNSBL presence for reputation monitoring

Monitoring Priorities:

• Watch for changes in risk score (currently stable at 49)
• Monitor neighborhood for abuse density changes
• Track any new blacklist additions

## Risk Rating: MODERATE

Assessment Rationale:

The IP demonstrates known attacker behavior with blacklist presence but shows no active services or persistent malicious campaigns. Residential ISP assignment limits attribution precision. Subnet-level risk is moderate (40/100). Recommended for monitoring and selective blocking based on organizational threat tolerance.

Classification: Defensive Security Intelligence

Last Updated: Current data snapshot

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