191.53.128.107
IP Intelligence Briefing: 191.53.128.107
Date: 2026-06-07
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**1. Risk Profile**
- Risk Score: 70 (High Risk)
- Provider: MASTER S/A (ASN 28202)
- Geolocation: Brazil (Minas Gerais), city: Montes Claros
- Network Role: Firewalled / No Services (no open ports, TLS, or HTTP detected)
- Threat Indicators: No direct malicious activity observed; no known attackers, spam, or Tor exit nodes.
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**2. Network & Ownership**
- ASN: 28202 (MASTER S/A)
- Subnet: 191.53.128.0/23
- BGP Analysis:
- Route stability: Unstable (10 route changes in 30 days).
- RPKI state: Not specified.
- IRR consistency: Matched.
- DNS:
- PTR hostname: `191-53-128-107.pso-wr.mastercabo.com.br`
- No email authentication (SPF/DKIM) detected.
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**3. Historical Observations**
- Risk Trends:
- Observed between May 30 and June 7, 2026.
- Confidence in signals varied (0.26–0.85).
- No persistent malicious activity detected.
- Network Changes:
- Subnet abuse density: 0.33 (mixed classification).
- 7 active siblings in /24 subnet, 7 flagged as high risk.
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**4. Relationships & Neighbors**
- Connected Entities:
- Linked to network `227148` (same ASN).
- DNS associations with `mastercabo.com.br`.
- Neighboring IPs (191.53.128.0/23):
- High-risk neighbors: 191.53.128.253 (80), 191.53.128.173 (70), 191.53.128.108 (55).
- Low-risk neighbors: 191.53.128.227 (0), 191.53.128.224 (55).
- Subnet abuse density: 5% (0.05).
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**5. Recommendations**
- Monitor Subnet: Track high-risk neighbors (e.g., 191.53.128.253) for potential lateral movement.
- Verify DNS: Investigate `mastercabo.com.br` for domain-based attacks or misconfigurations.
- Network Segmentation: Ensure firewalled segments (e.g., 191.53.128.0/23) are isolated from internal resources.
- Route Stability: Monitor BGP route changes for potential network hijacking or misconfigurations.
Note: No direct threat indicators detected, but contextual risks (subnet abuse, route instability) warrant further investigation.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | MASTER S/A |
| ASN | AS28202 |
| Network Name | 227148 |
| CIDR Block | 191.53.0.0/16 |
| RIR | LACNIC |
| Country | BR |
| Abuse Contact | — |
🌐 DNS Intelligence
| PTR | 191-53-128-107.pso-wr.mastercabo.com.br |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | 191-53-128-107.pso-wr.mastercabo.com.br |
🔐 DNS Hygiene
| Hygiene Score | 20% (Poor) |
| SPF | Not configured |
| DMARC | Not configured |
| FCrDNS | Not verified |
| DNSSEC | Valid |
| CAA | Not configured |
☁️ Network Classification
| Infrastructure | Unknown |
| Service Purpose | Firewalled / No Services |
| Network Tier | Tier 3 — Basic operator with some routing infrastructure |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| No open ports detected | |||
| Closed Ports | 22, 25, 80, 443, 3389, 8080, 8443 (0 open / 7 scanned) | ||
| Server | — |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | None |
| Valid From | — |
| Valid Until | — |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 27% | 2 | 3 |
| routing | 30% | 3 | 4 |
| services | 19% | 2 | 2 |
| ownership | 30% | 3 | 3 |
| reputation | 22% | 1 | 3 |
| geolocation | 27% | 2 | 3 |
| Overall | 26% | 13 | 18 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (65%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-14 13:24:16 UTC |
| Last Seen | 2026-06-07 05:57:46 UTC |
| Profile Built | 2026-06-07 06:06:22 UTC |
| Data Freshness | Live |
| Signal Types | 25 |
| Total Observations | 28 |
Full dossier details are available via our API.