# IP Intelligence Briefing: 51.222.168.39/32
Classification: Moderate Risk
Date: Current
Analyst: IPDebrief Intelligence Team
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## Executive Summary
IP address 51.222.168.39 is a cloud infrastructure endpoint hosted by OVH within the Ahrefs Pte Ltd customer network. The IP presents a moderate risk profile (score: 40/100) with no active threat indicators. The IP resolves to the ahrefs.net domain and operates as a firewalled cloud compute instance with no publicly accessible services.
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## Ownership & Infrastructure
| Attribute | Value |
|---|---|
| **ASN** | 16276 (OVH) |
| **Organization** | Dmytro, Ahrefs Pte Ltd |
| **CIDR Block** | 51.222.168.0/24 |
| **Network Classification** | CloudCompute / Hosting |
| **Infrastructure Type** | Cloud (OVH) |
The IP belongs to OVH's customer network OVH-CUST-281059697. No open ports or active services were detected on the target address.
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## Geolocation Analysis
| Attribute | Value |
|---|---|
| **Country** | CA (Canada) |
| **Region** | QC (Quebec) |
| **City** | Singapore |
| **DNS Resolution** | proxy-ca018-san39.ahrefs.net |
Note: Geolocation validation flagged an anomalyβthe system indicates Canada (CA) as the primary country, but the city field shows Singapore. Route metrics (30ms RTT vs. expected 112ms+ for trans-Pacific distance) suggest geolocation data may be unreliable for this endpoint.
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## Threat Assessment
| Indicator | Status |
|---|---|
| **Risk Score** | 40 (Moderate) |
| **Abuse Confidence** | Not available |
| **Tor Exit Node** | No |
| **Known Attacker** | No |
| **Spam Source** | No |
| **Blacklist Count** | 0 |
| **DNSBL Listed** | 1 of 8 lists |
No active threat feeds or known campaigns were associated with this IP. The single DNSBL listing indicates minor reputation concerns but does not constitute a known malicious indicator.
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## Neighborhood Analysis (51.222.168.0/24)
| Metric | Value |
|---|---|
| **Subnet Abuse Density** | 0.6836 (High) |
| **Active Siblings** | 219 of 256 |
| **Threat Siblings** | 175 |
| **Risk Distribution** | 99 medium, 1 high, 0 low |
The /24 subnet exhibits elevated abuse density (68.36%) with 175 of 256 total IPs classified as threat siblings. While the specific IP 51.222.168.39 shows moderate risk, the subnet context suggests coordinated infrastructure usage within the OVH cloud environment.
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## Historical Observations
22 signal observations recorded. Key temporal findings:
- Recent subnet classification signals indicate "high_abuse" classification
- Multiple geolocation signals with varying confidence levels (0.18β0.75)
- No persistent malicious activity detected
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## Recommended Actions
Defensive Posture: Monitor but allow traffic.
Firewall Rules:
- No immediate blocking recommended
- Consider monitoring for port scanning activity given subnet abuse density
- Monitor DNS queries to ahrefs.net for unusual patterns
Investigative Notes:
- The geolocation discrepancy warrants additional validation
- Monitor for any changes in service posture or threat indicators
- Consider correlation with known Ahrefs infrastructure for context
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Conclusion: This IP represents legitimate cloud infrastructure within the Ahrefs ecosystem. While the subnet shows elevated abuse density, the specific IP has no active malicious indicators. Treat as moderate-risk infrastructure requiring monitoring rather than immediate blocking.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
π’ Ownership & Registration
| Organization | Dmytro, Ahrefs Pte Ltd |
| ASN | AS16276 |
| Network Name | OVH-CUST-281059697 |
| CIDR Block | 51.222.168.0/24 |
| RIR | ARIN |
| Country | Singapore |
| Abuse Contact | β |
π DNS Intelligence
| PTR | proxy-ca018-san39.ahrefs.net |
| Forward Confirmed | No β PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca018-san39.ahrefs.net |
π DNS Hygiene
| Hygiene Score | 40% (Fair) |
| SPF | Not configured |
| DMARC | Not configured |
| FCrDNS | Not verified |
| DNSSEC | Valid |
| CAA | Present |
βοΈ Network Classification
| Infrastructure | Infrastructure / Datacenter |
| Service Purpose | Firewalled / No Services |
| Network Tier | Hosting β Infrastructure provider without advanced routing |
π 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 | β |
| HTTP Title | β |
π TLS Certificate
| SANs | None |
| Valid From | β |
| Valid Until | β |
π― Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 31% | 2 | 4 |
| routing | 13% | 1 | 1 |
| services | 15% | 2 | 2 |
| ownership | 19% | 2 | 2 |
| reputation | 31% | 1 | 3 |
| geolocation | 33% | 2 | 3 |
| Overall | 24% | 10 | 15 |
| Data Coherence | Mostly Consistent (80%) β 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
π Observation Timeline π Live
| First Seen | 2026-05-13 12:13:34 UTC |
| Last Seen | 2026-06-27 23:26:47 UTC |
| Profile Built | 2026-06-28 17:32:31 UTC |
| Data Freshness | Live |
| Signal Types | 21 |
| Total Observations | 26 |
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