51.161.37.238
IP Intelligence Briefing: 51.161.37.238
Date: 2026-06-15
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**1. Risk Profile**
- Overall Risk: Moderate (Risk Score: 40)
- Provider/Ownership: Owned by OVH (AS16276), registered to "Dmytro, Ahrefs Pte Ltd" (netname: OVH-CUST-281059684).
- Geolocation: Geotagged to Montreal, Canada (QC), but geo-validation fails due to inconsistent RTT (31ms vs. expected 121.6ms for 6,082km). This suggests potential spoofing or data-center-based infrastructure.
- Network Role: Cloud compute instance (OVH), no public services detected (open ports: 0).
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**2. Threat Indicators**
- No direct malicious activity: No indicators of spam, known attackers, or blacklisted activity.
- Subnet Context:
- High abuse density in 51.161.37.0/24 (abuse density: 0.6328).
- 162/256 sibling IPs in subnet flagged as high risk.
- 162 threat siblings (malicious IPs) in the same /24 range.
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**3. Network & Relationship Analysis**
- Control Plane:
- BGP prefix: 51.161.0.0/17 (OVH).
- Route stability: Unstable (route changes in last 30 days).
- Relationships:
- Linked to OVH-CUST-281059684 (same network).
- DNS: Points to `proxy-ca005-san238.ahrefs.net` (Ahrefs infrastructure).
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**4. Observation History**
- Recent Signals (30-day window):
- DNSSEC/CAA validation (mixed results).
- Geo-validation anomalies (RTT discrepancy).
- Subnet abuse density flagged as "high_abuse."
- No persistent threat activity detected.
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**5. Recommendations**
- Monitor subnet activity: The 51.161.37.0/24 subnet has a high abuse density. Investigate if this IP is part of a larger malicious network.
- Validate geolocation: The RTT discrepancy may indicate spoofing or data-center-based infrastructure. Cross-check with other geolocation tools.
- Check Ahrefs infrastructure: Confirm if this IP is part of legitimate Ahrefs operations or a compromised host.
- Track route stability: The BGP prefix (51.161.0.0/17) shows instability. Monitor for route hijacking or spoofing attempts.
Next Steps: Correlate with internal logs, check for DNS or TLS anomalies, and validate the IP’s role within the Ahrefs network.
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-san238.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca005-san238.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 | 40% | 2 | 3 |
| routing | 13% | 1 | 1 |
| services | 15% | 2 | 2 |
| ownership | 15% | 2 | 2 |
| reputation | 23% | 1 | 2 |
| geolocation | 40% | 2 | 3 |
| Overall | 24% | 10 | 13 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-24 00:32:53 UTC |
| Last Seen | 2026-06-28 23:25:28 UTC |
| Profile Built | 2026-06-29 05:28:02 UTC |
| Data Freshness | Live |
| Signal Types | 20 |
| Total Observations | 23 |
Full dossier details are available via our API.