109.81.5.90
IP Intelligence Briefing: 109.81.5.90
Date: 2026-06-07
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**1. Core Profile**
- Risk Score: 25 (Low Risk)
- Ownership: Registered to AS5610-MTN (O2 Czech Republic a.s.), ARIN-allocated since 2009.
- Geolocation: Prague, Czech Republic (50.09°N, 14.48°E).
- Network Role: Mobile carrier infrastructure (LTE/5G) operated by O2 Czech Republic.
- Threat Indicators: No malicious activity detected (no blacklists, campaigns, or abuse reports).
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**2. Network & DNS**
- Subnet: 109.81.5.0/24 (abuse density: 0%).
- DNS:
- PTR record: `109-81-5-90.rct.o2.cz`
- Hosted domain: `o2.cz` (SPF/DMArc records present).
- BGP:
- Prefix: `109.80.0.0/15`
- Route stability: Unstable (0 route changes in 30 days).
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**3. Observations & History**
- Recent Activity:
- No new threats or ownership changes detected in the last 30 days.
- Consistent geolocation and DNS records.
- Operator Score: 0.26 (Basic risk category).
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**4. Subnet Neighbors**
- Total Neighbors: 5 (109.81.5.0/24).
- Risk Distribution:
- 4 IPs with low risk (score 0).
- 1 IP with medium risk (score 50).
- Abuse Density: 0% (no suspicious activity in subnet).
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**5. Relationships**
- Linked Entities:
- O2 Czech Republic (AS5610-MTN).
- FTTX network (mobile infrastructure).
- DNS host: `109-81-5-90.rct.o2.cz`.
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**6. Recommendations**
- Monitoring: Track the subnet (109.81.5.0/24) for emerging threats, as one neighbor shows medium risk.
- Firewall: No immediate blocking required.
- Context: Valid mobile carrier IP with no malicious signals.
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Source: IPDebrief Threat Intelligence Platform.
Note: No actionable indicators detected. Retain in watchlist for subnet-level monitoring.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | AS5610-MTN |
| ASN | AS5610 |
| Network Name | FTTX |
| CIDR Block | 109.81.5.0/24 |
| RIR | ARIN |
| Country | CZ |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | 109-81-5-90.rct.o2.cz |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | 109-81-5-90.rct.o2.cz |
🔐 DNS Hygiene
| Hygiene Score | 80% (Excellent) |
| SPF | Present |
| DMARC | Present |
| FCrDNS | Verified |
| DNSSEC | Valid |
| CAA | Not configured |
☁️ Network Classification
| Infrastructure | Mobile |
| 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 | |||
| 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 | 13% | 1 | 1 |
| routing | 13% | 1 | 1 |
| services | 13% | 1 | 1 |
| ownership | 30% | 2 | 3 |
| reputation | 0% | 0 | 0 |
| geolocation | 13% | 1 | 1 |
| Overall | 14% | 6 | 7 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (70%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-16 08:55:37 UTC |
| Last Seen | 2026-06-07 20:16:24 UTC |
| Profile Built | 2026-06-07 20:25:07 UTC |
| Data Freshness | Live |
| Signal Types | 18 |
| Total Observations | 19 |
Full dossier details are available via our API.