51.161.65.32
# IP Intelligence Briefing: 51.161.65.32/32
## Executive Summary
IP address 51.161.65.32 is registered to OVH hosting infrastructure in Montreal, Canada. The IP carries a moderate risk score of 40 and is associated with the Ahrefs domain (ahrefs.net). The subnet exhibits high abuse density characteristics, warranting defensive posture consideration.
## Technical Profile
- Risk Score: 40 (Moderate Risk)
- ASN: 16276 (OVH)
- Organization: Dmytro, Ahrefs Pte Ltd
- Network: OVH-CUST-281059690
- Location: Montreal, QC, Canada
- Infrastructure Type: Cloud Compute (OVH Hosting)
- DNS Resolution: proxy-ca011-san32.ahrefs.net
- Classification: Cloud Infrastructure / Firewalled (No Services Detected)
## Threat Indicators
- Blacklist Status: Listed on 1 of 8 DNSBL checks
- Known Attacker: No
- Spam Source: No
- Tor Exit Node: No
- Campaign Correlation: None detected
- Control Plane Stability: Route unstable (non-MOAS status)
## Neighborhood Analysis
The /24 subnet (51.161.65.0/24) shows elevated abuse characteristics:
- Subnet Classification: High Abuse
- Abuse Density: 0.7266 (256 total IPs, 212 active)
- Threat Siblings: 186 IPs flagged as threats
- Inherited Risk Score: 29
- Neighbor Risk Distribution: 99 medium-risk, 1 low-risk, 0 high-risk
## Observation History
- Total Signals: 22 observations recorded
- Recent Activity: Listings detected on 2026-06-23 across 8 blacklist sources
- Maximum Severity: High
- Operator Score: 0.2174 (Minimal threat operator classification)
- Threat Persistence: No persistent malicious behavior detected
## Recommended Actions
The following firewall rules are recommended for deployment:
| Platform | Rule |
|---|---|
| iptables | `iptables -A INPUT -s 51.161.65.32 -j DROP` |
| nftables | `nft add rule inet filter input ip saddr 51.161.65.32 drop` |
| nginx | `deny 51.161.65.32;` |
| pfSense | `51.161.65.32/32` |
| Cloudflare WAF | Block IP with filter expression `ip.src eq 51.161.65.32` |
| AWS WAF | Address: `51.161.65.32/32`, Description: `IPDebrief risk 40` |
## Intelligence Assessment
The IP address operates within a high-abuse cloud hosting environment. While the Ahrefs domain association suggests legitimate web infrastructure, the subnet-level abuse density and blacklist presence indicate potential for opportunistic misuse. SOC teams should monitor for port scanning or brute force activity patterns. The moderate risk score combined with neighborhood context suggests a defensive-by-default posture is appropriate, with specific attention to rate limiting and connection validation controls.
Classification: Moderate Risk – Monitor
Priority: Medium
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-san32.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca011-san32.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 | 35% | 2 | 3 |
| routing | 13% | 1 | 1 |
| services | 15% | 2 | 2 |
| ownership | 15% | 2 | 2 |
| reputation | 22% | 1 | 2 |
| geolocation | 32% | 2 | 3 |
| Overall | 22% | 10 | 13 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-07 23:04:25 UTC |
| Last Seen | 2026-06-27 06:27:56 UTC |
| Profile Built | 2026-06-28 00:32:06 UTC |
| Data Freshness | Live |
| Signal Types | 20 |
| Total Observations | 25 |
Full dossier details are available via our API.