51.161.37.155
IP Intelligence Briefing: 51.161.37.155
Date: 2026-06-14
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**1. Core Profile**
- Risk Score: Moderate (40/100)
- Ownership: Hosted by OVH (ASN 16276), registered to Ahrefs Pte Ltd.
- Geolocation: Montreal, Quebec, Canada (plausibility questionable).
- Network Role: Cloud compute instance (OVH infrastructure), no public services detected.
- Threat Indicators: No direct malicious activity observed.
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**2. Temporal Observations**
- Recent Activity (2026-06-14):
- Network ownership confirmed (OVH).
- DNS records linked to ahrefs.net (CAA records present).
- Operator score: Minimal Risk (0.2174).
- Geo validation flagged as implausible (potential location spoofing).
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**3. Network Relationships**
- Linked Entities:
- Same network: OVH-CUST-281059684 (254 IPs in /24 subnet).
- DNS: Resolves to proxy-ca005-san155.ahrefs.net.
- No direct connections to known malicious domains or networks.
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**4. Subnet Analysis**
- Subnet: 51.161.37.0/24
- Abuse Density: 51.18% (130/254 IPs flagged as threats).
- Neighbor Risk:
- 100 IPs in subnet.
- 99 IPs flagged as medium/high risk; 1 low risk.
- Key Threat IPs: 51.161.37.0 (risk 50), 51.161.37.1 (risk 40).
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**5. Recommendations**
- Monitor Subnet: High abuse density suggests potential for lateral movement or botnet activity.
- Verify Geolocation: Discrepancies in geo validation may indicate spoofing or misconfigured infrastructure.
- Restrict Access: Implement network segmentation to isolate cloud instances.
- DNS Monitoring: Track DNS queries to ahrefs.net for anomalies.
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Next Steps: Investigate neighboring IPs (e.g., 51.161.37.0, 51.161.37.1) and validate the IP's geolocation source.
Tool: IPDebrief
Copyright: © 2026 Jason Alberino. All rights reserved.
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-san155.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca005-san155.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 | 26% | 2 | 4 |
| routing | 8% | 1 | 1 |
| services | 12% | 2 | 2 |
| ownership | 15% | 2 | 2 |
| reputation | 28% | 1 | 3 |
| geolocation | 19% | 2 | 2 |
| Overall | 18% | 10 | 14 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-07 23:04:25 UTC |
| Last Seen | 2026-06-27 06:10:41 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.