45.138.221.39📋 Copy

# IP Intelligence Briefing: 45.138.221.39/32

## Executive Summary

IP address 45.138.221.39 is classified as Moderate Risk (Risk Score: 55/100) with no active open services. The IP is associated with SAS-TELECOM-NET network infrastructure and has historical DNSBL listings. While currently showing no active threat indicators, the IP has been listed on 3 out of 8 threat intelligence feeds.

## Technical Profile

Network Infrastructure

• IP Address: 45.138.221.39/32
• BGP Prefix: 45.138.221.0/24
• ASN: 211028
• Organization: Administrator
• RIR: ARIN
• Network Classification: SAS-TELECOM-NET

Geolocation Data

• Country: CZ (Czech Republic)
• Coordinates: 49.82°N, 15.47°E
• Timezone: Europe/Prague
• Note: Geolocation data shows consistency across multiple sources with consensus validation enabled.

Service Status

• Open Ports: None detected
• TLS Certificate: Not present
• HTTP Banner: No active services
• Connection Type: Firewall / No Services

Threat Indicators

• Tor Exit Node: No
• Known Attacker: No
• Spam Source: No
• Blacklist Count: 3 DNSBL listings
• Campaign Correlation: None detected
• Cert Matches: 0

## Risk Assessment

Current Risk Profile

• Overall Risk Score: 55/100 (Moderate)
• Operator Score: 0.1304 (Minimal)
• Abuse Confidence: Historical DNSBL listings present
• Threat Persistence: 0 days
• Malicious Activity Duration: Not persistent

Temporal Analysis

Observation history shows 20 signal observations with recent activity documented as of June 2026. Risk signals indicate:

• Minimal operator-level threat classification
• DNSBL listings with high severity on historical data
• Consistent geolocation placement in Czech Republic

Neighborhood Analysis

• Subnet: 45.138.221.0/24
• Abuse Density: 0 (Low)
• Classification: Mostly Clean
• Active Siblings: 1
• Threat Siblings: 1 (Historical)

## Observed Relationships

The IP is associated with the SAS-TELECOM-NET network across multiple relationship records, indicating infrastructure connectivity within this network namespace.

## Recommended Actions

Immediate Mitigation

The elevated risk score (55/100) warrants increased monitoring and consideration of blocking:

Firewall Rules:

```bash

# iptables

iptables -A INPUT -s 45.138.221.39 -j DROP

# nftables

nft add rule inet filter input ip saddr 45.138.221.39 drop

# nginx

deny 45.138.221.39;

# pfSense

45.138.221.39/32

```

WAF Integration:

• Cloudflare WAF: Block IP with description "IPDebrief risk score 55"
• AWS WAF: Create rule for IP address 45.138.221.39/32

Monitoring Recommendations

• Increase logging verbosity for all traffic from this IP
• Review recent activity patterns for anomalous behavior
• Monitor for new services or port openings
• Track DNSBL listing changes

## Intelligence Notes

• The IP has historical DNSBL listings but currently shows no active threat indicators
• No open services detected, suggesting the IP may be residential or infrastructure with services not running
• The network shows low abuse density in the /24 subnet
• Risk score of 55 indicates moderate risk requiring monitoring rather than immediate aggressive blocking
• Historical data shows elevated severity on DNSBL listings; monitor for changes

## Conclusion

IP 45.138.221.39 presents a moderate risk profile suitable for enhanced logging and selective blocking. The absence of active services and low neighborhood abuse density suggests this is not an actively malicious infrastructure address, though the historical DNSBL listings warrant continued monitoring. SOC teams should implement recommended firewall rules and increase observation of traffic patterns.

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*Intelligence generated from IPDebrief platform data. Recommendations should be validated against additional threat intelligence sources before enforcement.*

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