47.128.121.157📋 Copy

## IP INTELLIGENCE BRIEFING

Target IP: 47.128.121.157/32

Classification: Moderate Risk (Score: 40)

Data Collection Date: 2026-06-21

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EXECUTIVE SUMMARY

IP 47.128.121.157 is a cloud infrastructure endpoint hosted by Amazon Web Services in Singapore. The IP exhibits moderate risk characteristics with a risk score of 40. While no direct threat indicators were identified, the IP resides within a subnet classified as high abuse density (0.6267), containing 47 threat-sibling addresses out of 75 active addresses in the 47.128.121.0/24 range.

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INFRASTRUCTURE PROFILE

Ownership & Provider

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

Geolocation

• Country: Singapore (SG)
• Region: ap-southeast-1
• Coordinates: 1.35°N, 103.82°E
• Timezone: Asia/Singapore

Network Role

• Infrastructure Type: AWS Cloud EC2 Instance
• Connection Type: Cloud-hosted
• Service Status: Firewalled / No Active Services
• DNS Resolution: ec2-47-128-121-157.ap-southeast-1.compute.amazonaws.com

DNS Configuration

• PTR Hostnames: ec2-47-128-121-157.ap-southeast-1.compute.amazonaws.com
• Forward Resolution: Confirmed (1 record)
• Email Authentication: SPF: Present, DMARC: Present

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THREAT INTELLIGENCE

Risk Indicators

• Risk Score: 40 (Moderate)
• Abuse Confidence Score: Not assigned
• Blacklist Status: 0 lists
• Tor Exit Node: False
• Known Attacker: False
• Spam Source: False
• Known Campaigns: None identified

Network Threat Context

The IP operates within a high-abuse-density subnet (47.128.121.0/24). Historical observations indicate:

• Subnet abuse density: 0.6267 (62.67%)
• Threat siblings: 47 of 75 active addresses
• Inherited risk score: 25

This neighborhood context suggests the subnet may be underutilized for legitimate services or experiencing elevated abuse activity.

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OBSERVATION HISTORY (Last 20 Signals)

Recent Activity Timeline

• 2026-06-21 13:26:31 UTC: Geolocation signal recorded (Singapore, confidence 70%)
• 2026-06-16 14:13:54 UTC: Port scanning detected (multiple ports scanned)
• 2026-06-16 13:36:51 UTC: Subnet abuse analysis (high_abuse classification)
• 2026-06-16 13:36:29 UTC: Ownership persistence verified (0 changes)
• 2026-06-16 13:31:36 UTC: Threat feed check (no matches)

Temporal Analysis

• Threat observation count: 1
• Is persistently malicious: False
• Ownership changes: 0
• Route stability: False (route changes observed in 30-day window)

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NETWORK RELATIONSHIPS

DNS Associations

• Primary hostname: ec2-47-128-121-157.ap-southeast-1.compute.amazonaws.com
• Multiple DNS association records confirmed

Network Relationships

• Same network: AMAZON-SIN (47.128.0.0/14)
• No organization-level relationships identified beyond AWS infrastructure

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SECURITY RECOMMENDATIONS

Immediate Actions

Given the moderate risk score and high-abuse subnet context, the following controls are recommended:

Firewall Rules

• iptables: `iptables -A INPUT -s 47.128.121.157 -j DROP`
• nftables: `nft add rule inet filter input ip saddr 47.128.121.157 drop`
• nginx: `deny 47.128.121.157;`

Cloud/WAF Integration

• Cloudflare WAF: Block 47.128.121.157 (risk score 40)
• AWS WAF: Add 47.128.121.157/32 to deny list with description "IPDebrief risk 40"

Operational Recommendations

1. Monitor for outbound connections from this IP to known malicious destinations

2. Correlate with network traffic logs for anomalous patterns

3. Consider subnet-level blocking for 47.128.121.0/24 if threat activity persists

4. Verify if this EC2 instance is authorized for business operations

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CONCLUSION

IP 47.128.121.157 presents moderate risk primarily due to its placement within a high-abuse-density AWS subnet. While the IP itself shows no direct threat indicators, the neighborhood context warrants monitoring. The infrastructure appears to be a legitimate AWS EC2 instance with proper DNS resolution and email authentication configured.

Recommended Priority: Monitor (Score 40)

Blocking Decision: Case-by-case based on traffic analysis and business requirements

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*Intelligence generated from IPDebrief platform data. Recommendations should be combined with additional signals before operational action.*

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