47.128.121.187📋 Copy

# IP Intelligence Briefing: 47.128.121.187/32

Classification: Moderate Risk — Cloud Infrastructure with Neighborhood Abnormality

Date: 2026-06-27

Analyst: IPDebrief Intelligence Team

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## Executive Summary

IP address 47.128.121.187 is assigned to Amazon Web Services (AWS) Singapore region (ap-southeast-1) and operates as cloud compute infrastructure. While the endpoint itself shows no direct malicious indicators, the associated /24 subnet demonstrates elevated abuse density (0.5632) with 49 active threat siblings among 65 active neighbors. The IP carries a risk score of 40 and is classified within a high-abuse neighborhood environment. No open services or active ports are currently detected.

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## Ownership and Geolocation

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## Threat Intelligence Indicators

Signal History: 26 observations recorded. Recent activity (2026-06-26 through 2026-06-27) consistently classified the subnet as "high_abuse" with inherited risk score of 22.

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## Network Neighborhood Analysis (47.128.121.0/24)

• Total Siblings: 88 IPs
• Active Siblings: 65 IPs
• Threat Siblings: 49 IPs
• Abuse Density: 0.5632 (Elevated)
• Classification: High Abuse

Risk Distribution:

• High Risk: 0
• Medium Risk: 79
• Low Risk: 9

Sample 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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## DNS and Network Services

DNSBL Status: Listed on 1 of 8 DNSBL lists

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## Relationship Graph

Total relationships identified: 52

Primary Associations:

• DNS: ec2-47-128-121-187.ap-southeast-1.compute.amazonaws.com (multiple associations)
• Network: AMAZON-SIN (AWS Singapore network)
• Control Plane: Origin ASN 16509, BGP Prefix 47.128.0.0/14

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## Recommended Security Actions

Despite AWS infrastructure classification, the elevated neighborhood abuse density warrants defensive positioning:

Firewall Rules

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## Threat Assessment and Operational Notes

1. Infrastructure Context: This is a legitimate AWS EC2 endpoint in the Singapore region. However, the surrounding /24 subnet exhibits abnormal abuse patterns.

2. Risk Mitigation: No direct threat indicators exist on this specific IP. However, the high-abuse neighborhood classification suggests compromised or misconfigured instances in the same subnet.

3. Recommended Approach:

- Block inbound connections at perimeter firewall

- Monitor for outbound connections from internal assets to this IP

- Consider subnet-level blocking if threat intelligence warrants

- Re-evaluate periodically as neighborhood dynamics may shift

4. False Positive Consideration: AWS cloud infrastructure commonly hosts legitimate services. Blocking should be combined with additional signals (e.g., connection patterns, payload analysis) before implementing permanent rules.

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End of Briefing

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