51.161.37.121
IP Intelligence Briefing: 51.161.37.121
Date: 2026-06-14
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**1. Core Profile**
- Risk Score: 40 (Moderate Risk)
- Ownership:
- ISP: OVH (ASN 16276)
- Organization: "Dmytro, Ahrefs Pte Ltd"
- Network: 51.161.37.0/24
- Geolocation:
- Country: Canada (QC, Montreal)
- Geo Validation: Discrepancy detected (RTT 27ms vs. expected 121.6ms for 6082km distance).
- Threat Indicators:
- No known malicious indicators, blacklists, or campaigns.
- DNSBL Listings: 1 out of 8 total lists (low confidence).
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**2. Network & Subnet Analysis**
- Subnet: 51.161.37.0/24
- Neighbor Risk Density:
- Abuse Density: 51.18% (moderate risk).
- Subnet Siblings: 254 IPs (164 active, 130 flagged as risky).
- High-Risk Neighbors: 0 (all neighbors have medium or low risk).
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**3. Historical Observations (Last 30 Days)**
- Threat Signals:
- 1 observation of low-confidence DNSBL listing.
- 21 total observations (mixed confidence levels).
- Geolocation Trends:
- Persistent geo-plausibility issues (RTT mismatch).
- Network Stability:
- No ownership changes detected.
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**4. Relationships & Dependencies**
- Linked Entities:
- Network: OVH-CUST-281059684
- DNS Hostname: `proxy-ca005-san121.ahrefs.net` (linked to Ahrefs).
- Certificates: No TLS certs detected.
- Routing: BGP prefix `51.161.0.0/17` (OVH).
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**5. Actionable Insights**
- SOC Recommendations:
- Monitor DNSBL Listings: Investigate the single DNSBL listing (e.g., spamhaus, SpamCop).
- Verify Geolocation: Check for spoofed location or proxy usage due to RTT discrepancies.
- Network Segmentation: Isolate this subnet if it hosts sensitive assets.
- DNS Validation: Confirm Ahrefs' ownership of `proxy-ca005-san121.ahrefs.net`.
- Risk Context:
- While not inherently malicious, the subnet’s moderate abuse density and geo-validation issues suggest potential for misuse.
- No immediate threat indicators, but ongoing monitoring is advised.
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End of Briefing
*Generated by IPDebrief Intelligence Platform*
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-san121.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca005-san121.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 | 29% | 2 | 4 |
| routing | 13% | 1 | 1 |
| services | 12% | 2 | 2 |
| ownership | 19% | 2 | 2 |
| reputation | 31% | 1 | 3 |
| geolocation | 32% | 2 | 3 |
| Overall | 23% | 10 | 15 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-07 23:04:25 UTC |
| Last Seen | 2026-06-27 06:08:40 UTC |
| Profile Built | 2026-06-28 00:11:36 UTC |
| Data Freshness | Live |
| Signal Types | 22 |
| Total Observations | 29 |
Full dossier details are available via our API.