54.39.0.51
IP Intelligence Briefing: 54.39.0.51
*Generated via IPDebrief Analysis*
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**Overview**
- Risk Score: 50 (Moderate Risk)
- Provider: OVH (ASN 16276)
- Organization: Ahrefs Pte Ltd (OVH-CUST-281059683)
- Geolocation: Canada (QC, Beauharnois)
- Network Role: Cloud Hosting (OVH infrastructure)
- Threat Indicators: No direct malicious activity detected.
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**Key Findings**
1. Ownership & Infrastructure:
- Owned by Ahrefs Pte Ltd (OVH customer).
- Part of a /24 subnet (54.39.0.0/24) with 47% abuse density.
- Subnet contains 108 active IPs, 117 flagged as threats.
2. DNS & Hostname:
- Resolves to `proxy-ca004-san51.ahrefs.net` (Ahrefs domain).
- No DNSSEC validation errors, but 2 DNSBL listings (moderate risk).
3. Network Behavior:
- Cloud Compute instance with no open ports or TLS services.
- BGP prefix `54.39.0.0/16` associated with OVH.
- Subnet shows mixed activity: 67% medium-risk neighbors, 33% low-risk.
4. Historical Observations (Last 30 Days):
- DNS resolution stability confirmed.
- No changes in ownership or threat signals.
- Subnet abuse density stable at ~47%.
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**Threat Context**
- No direct malicious indicators (no malware, spam, or campaigns).
- Subnet contains 117 threat siblings, suggesting potential for lateral movement or shared infrastructure risks.
- DNSBL listings (e.g., Spamhaus, OpenBL) indicate moderate reputational risk.
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**Recommended Actions**
1. Monitor Subnet Activity:
- Track anomalies in the 54.39.0.0/24 subnet due to high abuse density.
2. Verify DNS Records:
- Confirm legitimacy of `proxy-ca004-san51.ahrefs.net` to avoid misattribution.
3. Restrict Access:
- Apply firewall rules to block high-risk neighbors (e.g., via IPDebrief actions).
4. Check for Enumeration:
- Investigate if the subnet is part of a larger network compromise.
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Conclusion:
The IP is associated with a legitimate cloud provider (OVH) and appears to be a normal hosting instance. However, its subnet has a moderate abuse density, and DNSBL listings suggest potential for reputational risk. SOC teams should monitor the subnet for unusual activity and validate DNS relationships.
*Data sourced from IPDebrief analysis as of 2026-05-31.*
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-281059683 |
| CIDR Block | 54.39.0.0/24 |
| RIR | ARIN |
| Country | Singapore |
| Abuse Contact | — |
🌐 DNS Intelligence
| PTR | proxy-ca004-san51.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca004-san51.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 | 4 |
| routing | 13% | 1 | 1 |
| services | 15% | 2 | 2 |
| ownership | 19% | 2 | 2 |
| reputation | 31% | 1 | 3 |
| geolocation | 23% | 2 | 2 |
| Overall | 23% | 10 | 14 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-14 13:25:04 UTC |
| Last Seen | 2026-06-28 01:05:57 UTC |
| Profile Built | 2026-06-29 01:11:46 UTC |
| Data Freshness | Live |
| Signal Types | 20 |
| Total Observations | 24 |
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