216.151.138.234📋 Copy

# IP INTELLIGENCE BRIEFING

Target: 216.151.138.234/32

Classification: Known Attacker / Moderate Risk

Date: Intelligence generated from current threat feeds

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## EXECUTIVE SUMMARY

IP address 216.151.138.234 is classified as a known attacker with a risk score of 49 (Moderate Risk). The address is associated with Cisco Webex LLC (ASN 13445) in San Jose, CA, but is flagged on blocklist.de threat feeds. Despite legitimate cloud infrastructure ownership, the IP exhibits malicious behavior patterns warranting defensive action.

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## THREAT PROFILE

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## THREAT INDICATORS

• Threat Classification: Known Attacker (confirmed via threat intelligence feeds)
• Blacklist Status: Listed on blocklist.de
• DNS Activity: No forward resolution detected; no PTR hostnames
• Service Exposure: No open ports detected; infrastructure appears firewalled
• BGP Status: RPKI valid, route stable, prefix 216.151.128.0/20

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## NEIGHBORHOOD ANALYSIS

The /24 subnet (216.151.138.0/24) shows elevated abuse density:

• Subnet Classification: High Abuse
• Risk Distribution: 70 IPs Medium Risk, 30 IPs Low Risk, 0 High Risk
• Active Siblings: 165 out of 256 total IPs
• Abuse Density: 1.0 (normalized scale)

This indicates the subnet contains multiple compromised or abused addresses, suggesting potential lateral movement or shared infrastructure.

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## OBSERVATION HISTORY

Recent signal observations (June 24, 2026 timeframe) show:

• Consistent BGP and operator scoring patterns
• Multiple routing and stability assessments
• No ownership changes detected
• Threat observation count: 1

The IP maintains stable network presence without significant behavioral changes.

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## RELATIONSHIP MAPPING

Total relationships: 138

• Primary Type: Same Network (138 relationships)
• Associated Networks: Multiple CS-1711 network identifiers
• No External Entity Links: No certificates, hostnames, or organizations outside the network

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## RECOMMENDED ACTIONS

Immediate Actions (High Severity)

1. Block at Network Edge: Implement DROP rules for 216.151.138.234

2. Rate-Limit Consideration: Apply rate-limiting if full blocking is not feasible

Firewall Rules

• iptables: `iptables -A INPUT -s 216.151.138.234 -j DROP`
• nftables: `nft add rule inet filter input ip saddr 216.151.138.234 drop`
• nginx: `deny 216.151.138.234;`
• Cloudflare WAF: Block with expression `ip.src eq 216.151.138.234`
• AWS WAF: Add to blocklist with CIDR 216.151.138.234/32

Enhanced Monitoring

• Monitor for additional IPs from 216.151.138.0/24 subnet
• Track DNS query patterns from this subnet
• Review for similar threat indicators in related infrastructure

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## INTELLIGENCE NOTES

• False Positive Consideration: Legitimate Cisco Webex infrastructure may be compromised or hijacked
• Lateral Movement Risk: High-abuse density subnet suggests coordinated threat activity
• No Service Exposure: Despite no open ports, the "Known Attacker" classification indicates active malicious use

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Status: ACTIONABLE — Implement recommended firewall rules immediately

Confidence: Moderate (Risk score 49, single blacklist entry)

Next Review: 30 days or upon threat feed updates

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