51.161.37.56
IP Intelligence Briefing: 51.161.37.56
Date: June 16, 2026
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**1. Risk Profile**
- Risk Score: 40 (Moderate Risk)
- Provider: OVH (ASN 16276)
- Ownership: Dmytro, Ahrefs Pte Ltd (OVH-CUST-281059684)
- Geolocation: Canada (CA), Singapore (city)
- Network Role: CloudCompute (OVH infrastructure, hosting)
- Threat Indicators: No malicious activity detected (no indicators, blacklists, or campaigns).
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**2. Observation History**
- Recent Activity (June 16):
- Minimal risk score (0.2174).
- DNSSEC valid, CAA records present.
- No open ports or TLS certificates detected.
- Earlier Activity (June 11):
- High abuse density in subnet (0.6328).
- Subnet classification: high_abuse.
- 162/256 IPs in the /24 subnet flagged as threats.
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**3. Relationships**
- DNS Associations:
- Linked to `proxy-ca005-san56.ahrefs.net` (Ahrefs Pte Ltd).
- Network Context:
- Part of OVH's infrastructure, likely a cloud-hosted service.
- No direct ties to known attackers or Tor networks.
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**4. Neighborhood Analysis**
- Subnet: `51.161.37.56/24`
- Abuse Density: 63.28% (high_abuse classification).
- Neighbor Risk:
- 162/256 IPs in subnet flagged as threats.
- 192 active IPs, 99 medium-risk, 1 low-risk.
- Inherited Risk: 25% (substantial threat exposure from neighbors).
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**5. Recommendations**
- Monitor Subnet: High abuse density suggests potential compromise or malicious activity in the network.
- Restrict Access: Consider firewall rules to limit traffic from this subnet, given its high-risk context.
- Verify Legitimacy: Confirm Ahrefs Pte Ltd's use of this IP, as it may be a legitimate cloud service but shares a risky subnet.
- Track Changes: Monitor for evolving threats in the subnet, as abuse density could indicate ongoing malicious activity.
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End of Briefing
*Generated by IPDebrief for SOC teams. All data reflects observed signals as of June 16, 2026.*
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-san56.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca005-san56.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 | 35% | 2 | 3 |
| routing | 13% | 1 | 1 |
| services | 19% | 2 | 2 |
| ownership | 19% | 2 | 2 |
| reputation | 13% | 1 | 2 |
| geolocation | 24% | 2 | 3 |
| Overall | 20% | 10 | 13 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-29 18:15:17 UTC |
| Last Seen | 2026-06-29 06:46:16 UTC |
| Profile Built | 2026-06-29 07:00:59 UTC |
| Data Freshness | Live |
| Signal Types | 22 |
| Total Observations | 23 |
Full dossier details are available via our API.