216.73.216.163📋 Copy

# IP INTELLIGENCE BRIEFING

Target: 216.73.216.163/32

Classification: Low Risk / Infrastructure IP

Date: 2026-07-30

Status: Active Monitoring

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## EXECUTIVE SUMMARY

The IP address 216.73.216.163 is a low-risk infrastructure address associated with Anthropic, PBC operating via AWS Cloud. No active malicious activity detected. IP classified as firewalled with no open services. Subnet shows minimal abuse density (5.56%). Recommend routine monitoring only.

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## OWNERSHIP & GEOLLOCATION

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## RISK PROFILE

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## NETWORK SERVICES & FINGERPRINT

• Open Ports: None detected
• DNS Resolution: No PTR records, no forward resolution
• HTTP/HTTPS: No web services detected
• TLS Certificates: None
• Network Classification: Firewalled / No Services
• Cloud Provider: AWS (Confirmed via ASN 16509)

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## CONTROL PLANE ANALYSIS

• RPKI State: Valid (Route origin validated)
• BGP Prefix: 216.73.216.0/22
• Route Stability: Active (1 change in last 30 days)
• DNSSEC: Valid
• DNSBL Listings: 1 of 8 lists (likely false positive)
• Operator Score: 0.1304 (Minimal)

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## NEIGHBORHOOD ANALYSIS (216.73.216.0/24)

• Subnet Classification: Mostly Clean
• Abuse Density: 0.0556 (5.56%)
• Total Sibling IPs: 18
• Active Siblings: 8
• High Risk Siblings: 0
• Medium Risk Siblings: 2
• Low Risk Siblings: 13
• Threat Siblings: 1 (216.73.216.123, risk score 50)

Notable Neighbors:

• 216.73.216.123: Risk score 50 (elevated)
• 216.73.216.37: Risk score 40 (medium)

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## OBSERVATION HISTORY

Observation Count: 20 signals

Latest Observation: 2026-07-30 09:53 UTC

Threat Persistence: 0 days

Ownership Changes: 0

Recent signals indicate:

• Subnet classified as "mostly_clean"
• RPKI route validation confirmed
• No service enumeration detected
• No persistent malicious activity observed

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## RECOMMENDED ACTIONS

Current Status: Low Threat Profile

Recommended Actions:

1. Monitor: Continue routine monitoring for any behavioral changes

2. Alert Threshold: Flag risk score changes exceeding +50 points

3. Correlation: Monitor 216.73.216.123 for associated activity

4. Rule Suggestion: No blocking required; allow-list for legitimate AWS traffic

Firewall Rule: None required (infrastructure IP, no attack vectors)

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## INTELLIGENCE NOTES

This IP address represents legitimate cloud infrastructure for Anthropic's AWS deployment. The low risk score and absence of threat indicators support continued operations without intervention. Subnet context suggests minimal abuse risk, though one sibling IP (216.73.216.123) warrants monitoring for coordinated activity.

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Report Generated: IPDebrief Intelligence Platform

Classification: Defensive Security Intelligence

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