51.89.129.50
IP Intelligence Briefing: 51.89.129.50
Risk Rating: Moderate (Risk Score: 40)
Ownership & Geolocation:
- Organization: Ahrefs Pte Ltd (AS16276, OVH provider)
- Location: London, England, UK (geolocation inferred with 750km accuracy radius)
- Network Role: CloudCompute infrastructure (OVH-hosted, no public services)
Threat Indicators:
- No direct malicious activity detected (no abuse confidence scores, blacklist entries, or campaigns).
- Subnet 51.89.129.0/24 shows high abuse density (abuseDensity: 0.59), with 152/256 neighbors flagged as high-risk.
- DNS associations linked to proxy-uk008-san50.ahrefs.net (likely internal infrastructure).
Network Behavior:
- Routing: Stable BGP prefix (51.89.0.0/16), no route instability detected.
- Subnet Neighbors: 100 total IPs in subnet; 96 rated medium risk, 4 low risk.
Actionable Insights:
1. Monitor Subnet: The high-risk neighbors suggest potential lateral movement or compromised hosts in the same network.
2. Verify DNS Activity: Investigate DNS associations with `proxy-uk008-san50.ahrefs.net` for unusual query patterns.
3. Cloud Provider Security: Review OVH’s security practices for cloud compute instances, given the infrastructure’s exposure.
4. Geolocation Validation: Confirm the IP’s location aligns with Ahrefs’ operations, as geolocation data is inferred.
Recommendation:
- Temporarily block high-risk neighbors in the subnet using firewall rules.
- Correlate with internal logs for DNS or network anomalies tied to this subnet.
- Watch for changes in the subnet’s abuse density or new threat indicators.
*Data sourced from IPDebrief intelligence tools.*
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Ahrefs Pte Ltd Dmytro |
| ASN | AS16276 |
| Network Name | — |
| CIDR Block | 51.89.0.0/16 |
| RIR | ARIN |
| Country | — |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | proxy-uk008-san50.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-uk008-san50.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 | Tier 3 — Basic operator with some routing infrastructure |
🔌 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 | 36% | 2 | 4 |
| routing | 33% | 2 | 3 |
| services | 15% | 2 | 2 |
| ownership | 37% | 3 | 5 |
| reputation | 31% | 1 | 3 |
| geolocation | 30% | 2 | 3 |
| Overall | 30% | 12 | 20 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-21 21:00:59 UTC |
| Last Seen | 2026-06-28 16:29:24 UTC |
| Profile Built | 2026-06-29 04:34:01 UTC |
| Data Freshness | Live |
| Signal Types | 25 |
| Total Observations | 30 |
Full dossier details are available via our API.