47.128.121.9📋 Copy

# IP Intelligence Briefing: 47.128.121.9

## Executive Summary

Target 47.128.121.9 is a cloud infrastructure asset hosted by Amazon Web Services in Singapore. While the IP exhibits moderate individual risk (score: 40), it operates within a high-abuse density subnet (47.128.121.0/24) with an abuse density of 0.5676. The asset shows no direct threat indicators but warrants monitoring due to neighborhood context.

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## Infrastructure Profile

Classification: CloudCompute / Hosting Provider

Risk Score: 40 (Moderate Risk)

ASN: 16509 (Amazon Data Services Singapore)

Organization: AMAZON-SIN

Geolocation: Singapore (ap-southeast-1 region)

Network Block: 47.128.0.0/14

DNS Resolution: ec2-47-128-121-9.ap-southeast-1.compute.amazonaws.com

Infrastructure Status: Stable (no changes in 30 days)

---

## Threat Assessment

Direct Threat Indicators: None detected

• Not listed on major threat feeds
• No known campaign associations
• No blacklist entries (count: 0)
• Not a Tor exit node, proxy, or VPN endpoint
• No open ports detected

Contextual Risk Factors:

• Subnet Abuse Density: 0.5676 (High)
• Threat Siblings: 42 out of 74 total IPs in /24 subnet
• Inherited Risk Score: 22 (from neighborhood context)
• Control Plane: Listed on 1 DNSBL out of 8 total lists

---

## Observation History

Total Observations: 26 signals analyzed

Temporal Stability:

• Ownership: Stable (0 changes)
• Route: Stable (0 changes in 30 days)
• BGP Prefix: 47.128.0.0/14 via AS2914 → AS16509
• No persistent malicious activity observed

Recent Signals:

• June 2026: Confirmed AWS cloud infrastructure classification
• ASN age: 9,539 days (stable legacy assignment)
• RIR Registry: ARIN (United States)

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## Neighborhood Intelligence

Subnet: 47.128.121.0/24

Total Siblings: 74

Active Siblings: 45

Threat Siblings: 42

Risk Distribution: High: 0, Medium: 72, Low: 7

Notable Neighboring IPs (Risk Score 40):

• 47.128.121.6
• 47.128.121.7
• 47.128.121.13
• 47.128.121.52
• 47.128.121.53

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## Recommended Actions

Monitoring Priority: Medium

Recommended Controls:

1. Traffic Analysis: Monitor outbound connections from this subnet, particularly to high-risk destinations

2. Threat Intelligence Integration: Feed sibling IP data into correlation engines for contextual threat detection

3. Baseline Behavior: Establish normal traffic patterns for this AWS subnet to detect anomalies

4. DNS Filtering: Consider blocking or rate-limiting DNS queries to this subnet during threat events

5. Network Segmentation: If receiving traffic from this subnet, implement egress filtering

Firewall Rule Template (iptables):

```bash

# Monitor (not block) - allow traffic but log

iptables -A INPUT -s 47.128.121.0/24 -j LOG --log-prefix "AWS-SG-47.128.121:"

iptables -A INPUT -s 47.128.121.0/24 -j ACCEPT

# Or block if threat indicators escalate

# iptables -A INPUT -s 47.128.121.0/24 -j DROP

```

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## Conclusion

Target 47.128.121.9 presents moderate individual risk with no direct malicious indicators. However, the high-abuse density of the surrounding subnet (42 threat siblings) creates contextual risk. The IP operates within standard AWS cloud infrastructure with stable network characteristics. SOC teams should monitor traffic patterns and consider sibling IP correlations during threat investigations. No immediate blocking required, but maintain awareness of neighborhood threat activity.

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