47.128.121.66📋 Copy

# IPDEBRIEF THREAT INTELLIGENCE BRIEFING

Target: 47.128.121.66/32

Classification: Moderate Risk - Cloud Infrastructure

Date: Current Intelligence Cycle

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## EXECUTIVE SUMMARY

IP 47.128.121.66 is a legitimate Amazon Web Services (AWS) cloud compute resource hosted in Singapore (ap-southeast-1). The IP operates within a high-abuse density subnet (47.128.121.0/24) with an inheritance risk profile of 21-22. No active threat indicators or malicious activity observed against this specific address.

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## TECHNICAL PROFILE

Ownership:

• Organization: Amazon Data Services Singapore
• ASN: 16509 (Amazon.com, Inc.)
• CIDR Block: 47.128.0.0/14
• RIR: ARIN

Geolocation:

• Country: Singapore (SG)
• City: Singapore
• Coordinates: 1.35°N, 103.82°E
• Timezone: Asia/Singapore

Network Role:

• Classification: Cloud Infrastructure
• Provider: Amazon Web Services
• Connection Type: CloudCompute
• Infrastructure Type: Cloud
• Status: Firewalled / No Services Detected

DNS Resolution:

• PTR Hostname: ec2-47-128-121-66.ap-southeast-1.compute.amazonaws.com
• Forward Resolution: Confirmed
• Hosted Domain: amazonaws.com
• Email Auth: SPF and DMARC records present

Services:

• Open Ports: None detected
• TLS Certificate: Not exposed
• HTTP Banner: Not detected
• Network Role: Firewalled / No Services

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## THREAT INDICATORS

Current Risk Score: 40 (Moderate Risk)

• Provider Score: 0
• Authority Score: 0
• Stability Score: 0

Threat Indicators:

• Known Attacker: No
• Tor Exit Node: No
• Spam Source: No
• Blacklist Count: 0
• Known Campaigns: None
• Abuse Confidence Score: Not applicable

Control Plane:

• Route Stability: False
• Route Changes (30d): 0
• DNSBL Listed: 1 of 8 lists
• Operator Score: 0.2609 (Basic)
• RPKI State: Not available
• IRR Consistency: Not available

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## NEIGHBORHOOD ANALYSIS

Subnet: 47.128.121.66/24

• Total Siblings: 71
• Active Siblings: 41
• Threat Siblings: 38
• Abuse Density: 0.5352 (High Abuse Classification)
• Inherited Risk: 21

Adjacent IP Risk Distribution:

• High Risk: 0
• Medium Risk: 79
• Low Risk: 9
• Neighbors with Risk Score 40: 88+ IPs detected

Notable Neighbor IPs (Risk Score 40):

• 47.128.121.6, 47.128.121.7, 47.128.121.9, 47.128.121.13

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## OBSERVATION HISTORY

Total Signals Observed: 22

Signal Types Detected: Network Classification, FCRDNS, DNS, Subnet Analysis

Recent Observations:

• 2026-06-27: Subnet abuse density 0.5506 (High Abuse), Inherited Risk 22
• 2026-06-25: Network classification confirmed AWS CloudCompute, Operator Score 0.1304
• 2026-06-14: Abuse density 0.5352 (High Abuse), Inherited Risk 21

Temporal Analysis:

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

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## RELATIONSHIP MAPPING

Total Relationships: 48

Key Relationships:

• Network Association: AMAZON-SIN (Multiple instances)
• DNS Association: ec2-47-128-121-66.ap-southeast-1.compute.amazonaws.com
• Network Classification: Amazon Web Services Singapore Region

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## SECURITY ACTIONS & RECOMMENDATIONS

Recommended Actions: None

• No active threat indicators detected
• IP is legitimate cloud infrastructure
• No firewall rules required for blocking

Monitoring Considerations:

1. Monitor subnet 47.128.121.0/24 for elevated abuse activity (38 threat siblings detected)

2. Verify any outbound connections from this IP during incident response

3. Consider geo-blocking if Singapore traffic not required

4. Monitor for service changes (currently firewalled/no services)

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## RISK ASSESSMENT

Overall Risk: MODERATE

• IP is legitimate AWS infrastructure with no malicious indicators
• Hosted in a high-abuse subnet (AWS Singapore region)
• Inherited risk from subnet abuse patterns (score 21-22)
• No direct threat activity against this specific address

Threat Level: LOW

• No blacklisting, no campaign correlation
• Standard cloud compute endpoint
• Recommended for allow-listing with monitoring

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Report Generated By: IPDebrief Intelligence Analysis

Data Sources: IPDebrief Platform, Threat Feeds, DNS Resolution, BGP Routing Data

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