51.89.129.133
IP Intelligence Briefing: 51.89.129.133
Date: 2026-06-14
---
**1. Core Profile**
- Risk Score: 40 (Moderate Risk)
- Ownership:
- ASN: 16276
- Organization: Ahrefs Pte Ltd Dmytro
- Geolocation: London, England, GB (plausible, 750km accuracy radius)
- Network Role:
- Cloud Compute (OVH provider)
- Hosting: Yes | Residential: No | Mobile: No
- Threat Indicators:
- No direct malicious activity detected (no spam, Tor, or abuse listings)
- Subnet abuse density: 51.17% (high_abuse classification)
---
**2. Observation History**
- Recent Activity (last 30 days):
- Stable ownership (no recent transfers).
- DNS resolution to `proxy-uk008-san133.ahrefs.net` (ahrefs.net domain).
- BGP prefix: `51.89.0.0/16` (OVH network).
- Geolocation Consistency:
- Multiple probes confirm London, GB (RTT: 83–90ms).
---
**3. Relationships & Network Context**
- Linked Entities:
- Subnet: `51.89.129.133/24` (OVH network segment).
- Related IPs: 33 connections (primarily OVH infrastructure).
- Subnet Analysis:
- Abuse Density: 51.17% (high_abuse classification).
- Threat Neighbors: 131 out of 256 IPs in subnet flagged as risky.
- Inherited Risk: 20% (likely due to subnet-level abuse).
---
**4. Security Actions**
- Recommended Mitigations:
- Firewall Rules:
- `iptables`: `iptables -A INPUT -s 51.89.129.133 -j DROP`
- `nftables`: `nft add rule inet filter input ip saddr 51.89.129.133 drop`
- Cloud Providers:
- Cloudflare WAF: Block IP with rule `ip.src eq 51.89.129.133`
- AWS WAF: Add `51.89.129.133/32` to IP set
- Monitoring:
- Track DNS resolution patterns and subnet-level abuse trends.
---
**5. Summary & Analyst Notes**
- Threat Level: Low to moderate. No direct malicious indicators, but the subnet has a high abuse density.
- Context: Owned by Ahrefs (a legitimate SEO tool provider), but part of a larger OVH network with risky neighbors.
- Next Steps:
- Monitor for unexpected DNS or network behavior.
- Consider blocking the subnet (`51.89.129.0/24`) if broader risk mitigation is needed.
- Correlate with internal threat intel for additional context.
End of Briefing
*Generated via IPDebrief threat intelligence platform.*
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 | — |
| RIR | ARIN |
| Country | — |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | proxy-uk008-san133.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-uk008-san133.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 | 21% | 2 | 2 |
| ownership | 20% | 2 | 3 |
| reputation | 28% | 1 | 3 |
| geolocation | 33% | 2 | 3 |
| Overall | 25% | 10 | 15 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-18 03:23:26 UTC |
| Last Seen | 2026-06-28 06:41:59 UTC |
| Profile Built | 2026-06-29 00:46:38 UTC |
| Data Freshness | Live |
| Signal Types | 21 |
| Total Observations | 25 |
Full dossier details are available via our API.