51.161.65.99
IP Intelligence Briefing: 51.161.65.99
Date: 2026-06-11
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**1. Profile Summary**
- Risk Score: Moderate (50/100)
- Ownership:
- ASN: 16276 (OVH)
- Organization: Ahrefs Pte Ltd
- Network: 51.161.65.0/24
- Geolocation:
- Country: Canada (CA)
- City: Singapore (discrepancy noted; geolocation plausibility flagged as false)
- Threat Indicators:
- No malicious activity detected (no indicators, blacklists, or campaigns).
- Network Role:
- Cloud compute instance (OVH infrastructure).
- No CDN, VPN, or proxy associations.
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**2. Observation History**
- Recent Activity (2026-06-11):
- Minimal risk signals (confidence: 0.2–0.8).
- DNS resolution to `proxy-ca011-san99.ahrefs.net` (Ahrefs subdomain).
- Geolocation data from MaxMind suggests Canada, but plausibility is questionable.
- No persistent malicious behavior or ownership changes.
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**3. Relationships**
- Linked Entities:
- Same network: OVH-CUST-281059690 (51.161.65.0/24).
- DNS association: `proxy-ca011-san99.ahrefs.net` (Ahrefs subdomain).
- No direct links to known attackers, spam sources, or Tor nodes.
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**4. Neighborhood Analysis**
- Subnet: 51.161.65.99/24
- Risk Distribution:
- 75% medium-risk neighbors (25–50 score).
- 25% low-risk neighbors.
- Abuse density: 0 (no known abuse in subnet).
- Notable Neighbors:
- IPs with risk scores 25–50 (likely shared cloud infrastructure).
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**5. Recommendations**
- Monitor Traffic: Given the mixed risk in the subnet, monitor traffic patterns for anomalies.
- Verify Geolocation: Investigate the Singapore/Canada discrepancy for potential spoofing or misconfiguration.
- Check DNS: Ensure DNS records for `proxy-ca011-san99.ahrefs.net` are legitimate and not hijacked.
- Network Segmentation: Consider isolating high-risk neighbors in the subnet to mitigate potential lateral movement.
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Conclusion: The IP is part of Ahrefs' cloud infrastructure with no direct malicious activity. However, the subnet contains mixed-risk neighbors, and geolocation inconsistencies warrant further investigation. No immediate blocking recommended, but ongoing monitoring is advised.
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-san99.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca011-san99.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 | 27% | 2 | 4 |
| routing | 8% | 1 | 1 |
| services | 15% | 2 | 2 |
| ownership | 19% | 2 | 2 |
| reputation | 22% | 1 | 3 |
| geolocation | 19% | 2 | 2 |
| Overall | 18% | 10 | 14 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-26 00:50:58 UTC |
| Last Seen | 2026-06-29 02:32:39 UTC |
| Profile Built | 2026-06-29 02:42:00 UTC |
| Data Freshness | Live |
| Signal Types | 24 |
| Total Observations | 25 |
Full dossier details are available via our API.