51.161.37.139
IP Intelligence Briefing: 51.161.37.139
Date: 2026-06-10
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**1. Core Profile**
- Risk Score: 40 (Moderate Risk)
- Ownership: Owned by OVH (ASN 16276) under Dmytro, Ahrefs Pte Ltd.
- Geolocation: Montreal, Quebec, Canada (latitude 56.13, longitude -106.35; 3000km accuracy).
- Network Role: Hosting provider (firewalled, no public services).
- Threat Indicators: No malicious activity, spam, or known attacker associations.
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**2. Observation History**
- Recent Activity:
- Detected as a cloud-hosted IP (OVH) with no CDN/VPN/Tor indicators.
- Subnet 51.161.37.0/24 shows high abuse density (51.18%) with 130 threat siblings.
- Historical risk scores remain stable at 40 since June 2026.
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**3. Relationships**
- Linked Entities:
- Hostname: `proxy-ca005-san139.ahrefs.net` (Ahrefs, SEO tools).
- Network: Subnet 51.161.37.0/24 (OVH customer account 281059684).
- DNS: No email auth records (SPF/DKIM/DMArC absent).
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**4. Neighborhood Analysis**
- Subnet: 51.161.37.0/24 (254 total IPs).
- Risk Distribution:
- 79 IPs labeled medium risk (avg. score 40).
- 21 IPs labeled low risk.
- 0 IPs flagged as high risk.
- Abuse Density: 51.18% (high abuse classification).
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**5. Actionable Insights**
- Monitor Subnet: The subnet has a high abuse density, suggesting potential for lateral movement or shared hosting compromises.
- Verify Ahrefs Link: Investigate the Ahrefs hostname (`proxy-ca005-san139.ahrefs.net`) for any suspicious activity, as it may be a pivot point.
- Network Segmentation: Consider isolating this subnet if it hosts sensitive assets, given the mixed risk profile.
- Baseline Performance: The IP’s stable risk score (40) suggests no immediate escalation, but ongoing monitoring is advised.
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Threat Level: Moderate (subnetwork context suggests potential indirect risk).
Recommended Next Steps: Correlate with internal logs, check for C2 activity, and validate subnet-wide security controls.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Dmytro, Ahrefs Pte Ltd |
| ASN | AS16276 |
| Network Name | OVH-CUST-281059684 |
| CIDR Block | 51.161.37.0/24 |
| RIR | ARIN |
| Country | Singapore |
| Abuse Contact | — |
🌐 DNS Intelligence
| PTR | proxy-ca005-san139.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca005-san139.ahrefs.net |
🔐 DNS Hygiene
| Hygiene Score | 40% (Fair) |
| SPF | Not configured |
| DMARC | Not configured |
| FCrDNS | Not verified |
| DNSSEC | Valid |
| CAA | Present |
☁️ Network Classification
| Infrastructure | Infrastructure / Datacenter |
| Service Purpose | Firewalled / No Services |
| Network Tier | Hosting — Infrastructure provider without advanced routing |
🔌 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 | 30% | 2 | 3 |
| routing | 13% | 1 | 1 |
| services | 12% | 2 | 2 |
| ownership | 15% | 2 | 2 |
| reputation | 22% | 1 | 2 |
| geolocation | 35% | 2 | 3 |
| Overall | 21% | 10 | 13 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-07 23:04:25 UTC |
| Last Seen | 2026-06-27 06:09:50 UTC |
| Profile Built | 2026-06-28 00:13:49 UTC |
| Data Freshness | Live |
| Signal Types | 20 |
| Total Observations | 24 |
Full dossier details are available via our API.