51.21.182.81📋 Copy

IP Intelligence Briefing: 51.21.182.81

Date: 2026-06-14

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**1. Core Profile**

• Risk Score: 25 (Low Risk)
• Provider: Amazon Web Services (AWS)
• Geolocation: Stockholm, Sweden (SE)
• ASN: 16509 (IP Man, AWS)
• Network Role: AWS EC2 instance (firewalled, no public services)
• Threat Indicators:

- No known malicious campaigns, spam, or Tor exit nodes.

- DNSBL listed once (out of 8 total lists), suggesting potential spam or abuse activity.

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**2. Observation History**

• Stability: Stable ownership (no recent changes).
• Risk Trends:

- Low-risk score consistently over 30 days.

- One low-confidence DNSBL listing detected (June 3, 2026).

• Geolocation Validity:

- Plausibility score: False (discrepancy between AWS registration and Stockholm geolocation).

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**3. Network Relationships**

• Linked Entities:

- AWS EC2 Instance: `ec2-51-21-182-81.eu-north-1.compute.amazonaws.com`

- ASN 16509: Amazon Web Services (US-based registry).

• Subnet: `51.21.182.81/24` (classified as "mostly_clean" with 1 abuse-reported sibling).

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**4. Neighborhood Analysis**

• Subnet Abuse Density: 1/100 (low risk).
• Neighbors: No active sibling IPs detected in the /24 subnet.

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**5. Threat Context**

• No Malicious Activity: No indicators of exploitation, malware, or C2 communication.
• DNSBL Flag: Requires investigation into potential spam or abuse activity.
• AWS Context: Likely a legitimate EC2 instance; monitor for unusual traffic patterns.

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**6. Recommendations**

• Monitor: Track DNSBL status and AWS security logs for anomalies.
• Verify: Confirm geolocation discrepancy with AWS support.
• Firewall: Consider allowing traffic only from trusted sources, given AWS infrastructure context.

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Product: IPDebrief | Copyright: 2026 Jason Alberino. All rights reserved.

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