51.161.65.41
## IP INTELLIGENCE BRIEFING: 51.161.65.41/32
EXECUTIVE SUMMARY
IP 51.161.65.41 presents a moderate risk profile (risk score: 40) with characteristics consistent with OVH cloud hosting infrastructure. The IP resolves to aforesaid.net domain infrastructure and exhibits elevated neighborhood abuse density, warranting defensive monitoring.
OWNERSHIP AND INFRASTRUCTURE
- ISP/Provider: OVH (ASN 16276)
- Organization: Dmytro, Ahrefs Pte Ltd
- Network Block: 51.161.65.0/24 (OVH-CUST-281059690)
- Infrastructure Type: Cloud Compute / Hosting
- Geolocation: Canada (CA), Singapore city designation (low confidence; 3000km accuracy radius)
THREAT ASSESSMENT
- Risk Score: 40/100 (Moderate Risk)
- Known Attacker: No
- Tor Exit Node: No
- Spam Source: No
- Blacklist Status: Listed on 1 of 8 DNSBLs
- Abuse Confidence Score: Not calculated
NETWORK BEHAVIOR
- Open Ports: None detected (service classification: Firewalled / No Services)
- DNS Records: PTR hostname proxy-ca011-san41.ahrefs.net
- Forward Resolution: Unconfirmed (ahrefs.net domain)
- SSL/TLS: No certificates observed
SUBNET ANALYSIS (51.161.65.0/24)
- Abuse Density: 0.6016 (60%)
- Classification: high_abuse
- Active Siblings: 206 of 256 total IPs
- Threat Siblings: 154
- Inherited Risk Score: 24
OBSERVATION HISTORY
23 total observations recorded. Recent trend indicates:
- Abuse density increased from 0.6016 to 0.7305 (June 14 to June 19)
- Threat siblings increased from 154 to 187
- Classification consistently high_abuse throughout observation period
RELATIONSHIPS
50 relationships detected, primarily same-network associations with OVH-CUST-281059690 CIDR block.
RECOMMENDED ACTIONS
The following firewall rules are recommended based on risk assessment:
| Platform | Rule |
|---|---|
| iptables | `iptables -A INPUT -s 51.161.65.41 -j DROP` |
| nftables | `nft add rule inet filter input ip saddr 51.161.65.41 drop` |
| nginx | `deny 51.161.65.41;` |
| pfSense | `51.161.65.41/32` |
| Cloudflare WAF | `ip.src eq 51.161.65.41` (action: block) |
| AWS WAF | `Addresses: ["51.161.65.41/32"]` |
ANALYST NOTES
The IP resolves to ahrefs.net infrastructure but shows elevated neighborhood abuse patterns typical of OVH shared hosting environments. The moderate risk score combined with high abuse density classification suggests potential for compromised infrastructure or opportunistic abuse. Consider blocking at perimeter firewall while monitoring for legitimate ahrefs.net traffic patterns.
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-san41.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca011-san41.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 | 28% | 2 | 4 |
| routing | 8% | 1 | 1 |
| services | 17% | 2 | 3 |
| ownership | 12% | 2 | 2 |
| reputation | 27% | 1 | 3 |
| geolocation | 35% | 2 | 3 |
| Overall | 21% | 10 | 16 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-10 16:14:40 UTC |
| Last Seen | 2026-06-27 18:04:00 UTC |
| Profile Built | 2026-06-28 12:09:09 UTC |
| Data Freshness | Live |
| Signal Types | 21 |
| Total Observations | 28 |
Full dossier details are available via our API.