51.161.37.0
IP Intelligence Briefing: 51.161.37.0
*Generated via IPDebrief tools*
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**1. Core Profile**
- Risk Score: 50 (Moderate Risk)
- Ownership:
- AS: AS16276 (OVH)
- Organization: Ahrefs Pte Ltd
- Network: OVH-CUST-281059684
- Geolocation:
- Country: Canada (CA)
- City: Montreal (QC)
- Geo Plausibility: ❌ Invalid (RTT discrepancy detected)
- Threat Indicators:
- No malicious indicators, blacklists, or campaigns detected.
- DNS: PTR hostname `proxy-ca005-san0.ahrefs.net` (linked to Ahrefs).
- Network Role:
- Hosting: Yes (OVH cloud infrastructure)
- Subnet: 51.161.37.0/24 (OVH-managed)
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**2. Observation History**
- Recent Activity:
- Observed 24 signals over 30 days (last update: 2026-06-09).
- Geolocation: Confirmed Montreal, Canada (latitude 56.13, longitude -106.35).
- Network Stability: Stable BGP routes (no recent changes).
- Risk Trends:
- No persistent malicious activity detected.
- Abuse Density: 0.59 (high abuse classification for subnet).
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**3. Relationships**
- Network Affiliation:
- Linked to OVH-CUST-281059684 (same network).
- Subnet Neighbors:
- 256 IPs in 51.161.37.0/24 subnet.
- Threat Siblings: 152 IPs flagged as high/medium risk.
- Abuse Density: 59.38% (high-risk subnet).
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**4. Neighborhood Analysis**
- Subnet Risk:
- Total IPs: 256
- Active IPs: 180
- High-Risk IPs: 152 (68.75% of subnet)
- Inherited Risk: 23 (moderate)
- Notable Neighbors:
- 100+ IPs with moderate risk scores (40–50).
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**5. Recommendations**
- Monitoring:
- Monitor subnet for unusual traffic patterns due to high abuse density.
- Validate geolocation anomalies (Montreal vs. RTT discrepancy).
- Network Segmentation:
- Consider isolating high-risk subnets to mitigate lateral movement risks.
- DNS Security:
- Verify DNSSEC and CAA records for Ahrefs domains.
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Summary:
The IP 51.161.37.0 is part of OVH's network, owned by Ahrefs Pte Ltd, and classified as moderate risk. While no direct malicious activity is detected, its subnet (51.161.37.0/24) has a high abuse density, warranting closer scrutiny. Geolocation anomalies and inherited risks suggest further investigation into network behavior.
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-san0.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca005-san0.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 | 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 | 30% | 2 | 3 |
| routing | 27% | 2 | 3 |
| services | 15% | 2 | 2 |
| ownership | 26% | 3 | 3 |
| reputation | 28% | 1 | 3 |
| geolocation | 33% | 2 | 3 |
| Overall | 26% | 12 | 17 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-21 21:00:50 UTC |
| Last Seen | 2026-06-28 16:05:43 UTC |
| Profile Built | 2026-06-29 04:10:01 UTC |
| Data Freshness | Live |
| Signal Types | 24 |
| Total Observations | 27 |
Full dossier details are available via our API.