191.53.9.91
IP Intelligence Briefing: 191.53.9.91
Date: 2026-05-30
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**1. Core Profile**
- Risk Score: Moderate (55/100)
- Ownership: Registered to MASTER S/A (ASN 28202, LACNIC) in Brazil (BR).
- Geolocation: São Paulo, Brazil (subnet 191.53.9.0/24).
- Network Role: Firewalled / No Services; no public-facing ports or TLS certificates detected.
- Threat Indicators: No indicators of malicious activity, spam, or known attacker associations.
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**2. Observation History**
- Recent Activity (Last 2 Days):
- Scans detected on May 29–30, 2026, with moderate confidence (0.70–0.95).
- No persistent threats or malware campaigns linked.
- Subnet abuse density (191.53.9.0/24) is 8.1%, with 15/38 neighbors flagged as high/medium risk.
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**3. Relationships & DNS**
- DNS Associations:
- Linked to 191-53-9-91.lna-wr.soumaster.com.br (PTR record).
- No email authentication (SPF/DKIM) or domain hosting detected.
- Network Relationships:
- Shares subnet with 15 high/medium-risk IPs (e.g., 191.53.9.34 [80], 191.53.9.182 [80]).
- No direct ties to Tor, CDN, or cloud infrastructure.
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**4. Neighborhood Analysis**
- Subnet (191.53.9.0/24):
- 37 total IPs, 15 flagged as high/medium risk (abuse density 8.1%).
- Key risky neighbors:
- 191.53.9.34 (80), 191.53.9.182 (80), 191.53.9.112 (80).
- Recommendation: Monitor high-risk neighbors for lateral movement or coordinated activity.
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**5. Threat & Risk Summary**
- No immediate threats detected, but the subnet has a moderate risk profile.
- Actionable Steps:
- Monitor DNS hostname 191-53-9-91.lna-wr.soumaster.com.br for suspicious activity.
- Block high-risk neighbors (e.g., 191.53.9.34, 191.53.9.182) using iptables/nftables.
- Investigate potential network segmentation issues given the mixed subnet risk.
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End of Briefing
*Generated by IPDebrief for SOC analysis.*
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 | 191-53-9-91.lna-wr.soumaster.com.br |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | 191-53-9-91.lna-wr.soumaster.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 | Unknown — Insufficient routing data to classify |
🔌 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 | 17% | 1 | 1 |
| routing | 17% | 1 | 1 |
| services | 17% | 1 | 1 |
| ownership | 24% | 2 | 2 |
| reputation | 0% | 0 | 0 |
| geolocation | 29% | 2 | 2 |
| Overall | 17% | 7 | 7 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Recent
| First Seen | 2026-05-14 01:09:21 UTC |
| Last Seen | 2026-06-26 18:10:58 UTC |
| Profile Built | 2026-06-09 07:14:42 UTC |
| Data Freshness | Recent |
| Signal Types | 18 |
| Total Observations | 18 |
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