173.255.221.151📋 Copy

THREAT INTELLIGENCE BRIEFING

Target IP: 173.255.221.151

Classification: Cloud Infrastructure (Linode)

Date of Analysis: 2026-06-16

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## EXECUTIVE SUMMARY

IP address 173.255.221.151 is a Linode cloud compute instance (AS63949) located in Fremont, CA. The asset presents LOW RISK with an overall risk score of 25/100. The IP is currently listed on 1 of 8 DNS blacklists. No active malicious campaigns or known attack patterns were detected.

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## INFRASTRUCTURE PROFILE

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## NETWORK CHARACTERISTICS

Open Services:

• Port 22/TCP: SSH (OpenSSH 8.9p1 Ubuntu-3ubuntu0.15)

Control Plane Data:

• Route Stability: UNSTABLE (isRouteStable: false)
• DNSSEC: Valid
• DNSBL Lists: 1/8 total lists
• Operator Score: 0.2609 (Basic)

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## THREAT INDICATORS

Current Risk Assessment:

• Risk Score: 25/100 (Low Risk)
• Abuse Confidence Score: Not available
• Known Attacker: No
• Spam Source: No
• Tor Exit Node: No
• Blacklist Count: 0 (profile-level), 1 (DNSBL)
• Active Threat Campaigns: None

GeoValidation:

• RTT vs Distance: Violation detected
• Minimum Possible RTT: 176.9ms
• Observed RTT: 81.0ms
• Distance: 8,843.8km
• Note: Geographic discrepancy detected; RTT inconsistent with reported location

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## NEIGHBORHOOD ANALYSIS (173.255.221.0/24)

Identified Threat Neighbor:

• 173.255.221.189: Risk Score 50/100, Authority Score 60/100
• Recommendation: Monitor this neighboring IP for coordinated activity

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## OBSERVATION HISTORY

Total Observations: 22

Recent Activity (2026-06-16):

• Subnet classification: Mostly Clean (abuse_density: 0.5)
• Threat pulses detected: 9 (source: AlienVault OTX)
• Operator assessment: Basic (raw_score: 0.3)
• Overall confidence: 0.2575

Threat Persistence: 0 days

Ownership Changes: 0

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## RELATIONSHIP GRAPH

Total Relationships: 18

Key Associations:

• Multiple Same Network relationships to LINODE infrastructure
• DNS Association: prod-boron-us-west-10.li.binaryedge.ninja (repeated multiple times)

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## SECURITY RECOMMENDATIONS

Current Status: No specific firewall rules or blocking recommendations generated due to low-risk profile.

Suggested Monitoring Actions:

1. Monitor neighboring IP 173.255.221.189 for elevated activity

2. Investigate DNS blacklist listing (1/8 lists)

3. Consider geovalidation discrepancy during incident triage

4. Monitor for route stability changes

Classification Flags:

• Cloud Infrastructure: Yes
• CDN: No
• VPN: No
• Proxy: No
• Hosting: Yes
• Mobile: No
• Residential: No
• Bogon: No

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## CONCLUSION

The target IP 173.255.221.151 represents low-risk cloud infrastructure hosted on Linode. No immediate threat indicators warrant blocking. SOC analysts should monitor the associated subnet for the identified threat sibling (173.255.221.189) and maintain awareness of the geographic validation discrepancy.

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