51.161.65.215
IP Intelligence Briefing: 51.161.65.215
Date: 2026-06-07
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**1. Core Profile**
- Risk Score: Moderate (50/100)
- Ownership:
- AS: AS16276 (OVH)
- Organization: Ahrefs Pte Ltd (OVH-CUST-281059690)
- CIDR: 51.161.65.0/24
- Geolocation:
- Country: Canada (CA)
- City: Singapore
- GeoPlausible: False (RTT 25ms inconsistent with 6082km distance)
- Network Role:
- Cloud Compute: Yes (OVH-hosted, no residential/mobile indicators)
- Services: No open ports, no TLS/HTTP services detected
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**2. Threat & Abuse Indicators**
- Threat Signals:
- No direct malicious indicators (no spam, Tor, or known attacker flags).
- Subnet abuse density: 0.2874 (Moderate), with 71/247 siblings flagged as threats.
- DNS Associations:
- Linked to proxy-ca011-san215.ahrefs.net (Ahrefs domain).
- No email authentication (SPF/DKIM) detected.
- Routing:
- BGP prefix: 51.161.0.0/17
- RPKI invalid: No state reported.
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**3. Historical Observations**
- Signal Trends:
- Recent observation (2026-06-07) shows abuse density 0.5059 (High) in its subnet.
- Operator score: 0.2174 (Minimal), but subnet classification is "mixed".
- Consistency:
- No persistent malicious activity detected (threat persistence: 0 days).
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**4. Relationships & Neighbors**
- Key Relationships:
- Same Network: OVH-CUST-281059690 (51.161.65.0/24).
- DNS: proxy-ca011-san215.ahrefs.net (Ahrefs infrastructure).
- Subnet Neighbors:
- 111 active IPs in 51.161.65.0/24.
- 71 threat siblings (28.74% abuse density).
- High-risk neighbors include IPs with DNSBL listings and mixed reputation.
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**5. Actionable Intelligence**
- SOC Analyst Recommendations:
- Monitor Subnet: High abuse density in 51.161.65.0/24 warrants closer scrutiny of traffic patterns.
- Validate DNS: Investigate DNS associations with `proxy-ca011-san215.ahrefs.net` to ensure legitimacy.
- Check for Spoofing: GeoPlausible flag is false—consider spoofed location or misconfigured DNS.
- Firewall Rules:
- Block all traffic from 51.161.65.0/24 if not explicitly trusted.
- Add to DNSBL lists if untrusted.
Note: This IP is associated with Ahrefs, a legitimate company, but its subnet exhibits mixed risk. Further investigation into the subnet's activity is recommended.
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-san215.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca011-san215.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 | 31% | 2 | 2 |
| routing | 13% | 1 | 1 |
| services | 21% | 2 | 2 |
| ownership | 15% | 2 | 2 |
| reputation | 22% | 1 | 2 |
| geolocation | 33% | 2 | 3 |
| Overall | 23% | 10 | 12 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-16 08:57:26 UTC |
| Last Seen | 2026-06-28 03:27:30 UTC |
| Profile Built | 2026-06-28 21:31:46 UTC |
| Data Freshness | Live |
| Signal Types | 19 |
| Total Observations | 23 |
Full dossier details are available via our API.