216.151.137.28📋 Copy

# IP Intelligence Briefing: 216.151.137.28/32

Classification: Moderate Risk | Risk Score: 40 | Date: 2026-06-20

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## Executive Summary

IP address 216.151.137.28 is a Cisco Webex LLC infrastructure IP located in New York, US, operating within the 216.151.128.0/19 BGP prefix. The IP presents moderate risk (score 40) with a classification of "high_abuse" in its /24 neighborhood, which contains 97 active sibling IPs. No malicious threat indicators were detected on this specific address, but the neighborhood context warrants monitoring.

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## Infrastructure Profile

Ownership & Control:

• Organization: Cisco Webex LLC
• ASN: 13445
• BGP Prefix: 216.151.128.0/19
• RIR: ARIN
• Registration: Route stability flagged as false

Geolocation:

• Country: United States
• Region: New York (US-NY)
• Coordinates: 4104.7 km validation distance
• Status: Geo validation incomplete (ICMP blocked)

Network Role:

• Classification: Firewalled / No Services
• Open Ports: None detected
• CDN/Proxy/VPN: Negative
• Tor Exit Node: No
• DNSBL Listed: 1 of 8 total lists

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## Threat Assessment

Observed Threat Indicators:

• Threat Reputation: No known attacker status
• Spam Source: Negative
• Known Campaigns: None detected
• Certificate Matches: 0
• Banner Matches: 0

Control Plane Analysis:

• Operator Score: 0.1304 (Minimal)
• DNSSEC Valid: Yes
• Route Changes (30d): 0
• MoAS Status: No

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## Neighborhood Analysis

Subnet Context: 216.151.137.28/24

• Total Siblings: 256
• Active Siblings: 97
• Abuse Density: 1 (High Abuse Classification)
• Risk Distribution: 100 medium-risk IPs, 0 high-risk, 0 low-risk
• Authority Score (Average): 50

Implication: The /24 subnet exhibits elevated abuse density with consistent medium-risk classification across neighbors. This suggests infrastructure-level activity rather than isolated malicious behavior.

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## Observation History

Signal Count: 43 total observations

Latest Activity: 2026-06-20 (multiple timestamps)

Temporal Analysis:

• Threat Observation Count: 1
• Threat Persistence Days: 0
• Ownership Changes: 0
• Is Persistently Malicious: No

Recent Signal Trends:

• Operator score consistently measured at 0.1304
• DNSSEC signals present with minimal classification
• No escalation in threat signals observed

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## Relationship Graph

Total Relationships: 125

Primary Relationship Types:

• Same Network (CS-1711): 125+ instances

The relationship graph indicates strong network-level associations with CS-1711 network designation, suggesting this IP is part of a larger organizational infrastructure cluster.

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## Recommended Actions

Firewall Rules Generated:

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## Intelligence Narrative

The IP address 216.151.137.28 represents Cisco Webex LLC infrastructure in New York with a moderate risk profile. While the specific IP shows no direct malicious indicators, its placement in a high-abuse density subnet (216.151.137.0/24) suggests potential for opportunistic abuse or compromised endpoints within the network. The infrastructure is firewalled with no open services, indicating legitimate hosting or corporate use.

Recommendation: Implement monitoring rather than aggressive blocking. The neighborhood context (high_abuse classification, 97 active siblings) suggests network-wide activity patterns. Consider subnet-level policy if false positives are not a concern. Monitor for any escalation in threat signals or emergence of malicious indicators on this or related addresses in the 216.151.137.0/24 range.

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