51.161.65.137
IP Intelligence Briefing: 51.161.65.137
Date: June 1, 2026
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**1. Profile Summary**
- Risk Score: 50 (Moderate Risk)
- Ownership:
- ISP: OVH (AS16276)
- Organization: Dmytro, Ahrefs Pte Ltd
- Location: Montreal, Quebec, Canada (geolocation plausible: false)
- Network Role:
- Cloud compute instance (OVH infrastructure)
- No open ports, no TLS certs, no HTTP services detected
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**2. Threat Indicators**
- No direct malicious indicators: No abuse confidence scores, no blacklists, or known campaigns.
- DNS Associations: Linked to `proxy-ca011-san137.ahrefs.net` (possibly a proxy or internal host).
- Geolocation Anomalies:
- RTT (Round-Trip Time) of 27ms inconsistent with 6082km distance (minimum plausible RTT: 121.6ms).
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**3. Network & Subnet Analysis**
- Subnet: 51.161.65.0/24
- Neighbor Risk:
- 73 IPs with medium risk (25–50), 27 with low risk (<25).
- Subnet abuse density: 30.65% (moderate).
- Network Stability:
- Route stability: false (potential instability).
- BGP prefix: 51.161.0.0/17 (OVH-controlled).
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**4. Historical Observations**
- Recent Activity (June 1, 2026):
- DNS resolution for `proxy-ca011-san137.ahrefs.net`.
- Network classification as "mixed" (partially malicious siblings).
- No persistent threat signals.
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**5. Recommended Actions**
- Firewall Blocking (Example Rules):
- iptables: `iptables -A INPUT -s 51.161.65.137 -j DROP`
- Cloudflare WAF: Block IP with rule `ip.src eq 51.161.65.137`
- AWS WAF: Add `51.161.65.137/32` to a custom rule.
- Monitoring: Track DNS and network changes, as the subnet has a moderate abuse density.
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**6. Conclusion**
This IP is part of OVH's cloud infrastructure, associated with Ahrefs, and shows no direct malicious activity. However, its subnet has a moderate risk profile, and geolocation anomalies suggest potential spoofing or misconfiguration. Monitor for unexpected changes in network behavior or new threat indicators.
Product: IPDebrief | Copyright: © 2026 Jason Alberino. All rights reserved.
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-281059690 |
| CIDR Block | 51.161.65.0/24 |
| RIR | ARIN |
| Country | Singapore |
| Abuse Contact | — |
🌐 DNS Intelligence
| PTR | proxy-ca011-san137.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca011-san137.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 | 34% | 2 | 3 |
| routing | 13% | 1 | 1 |
| services | 15% | 2 | 2 |
| ownership | 15% | 2 | 2 |
| reputation | 23% | 1 | 2 |
| geolocation | 40% | 2 | 3 |
| Overall | 23% | 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 00:32:55 UTC |
| Last Seen | 2026-06-28 23:26:19 UTC |
| Profile Built | 2026-06-29 05:28:02 UTC |
| Data Freshness | Live |
| Signal Types | 20 |
| Total Observations | 22 |
Full dossier details are available via our API.