54.39.136.7
IP Intelligence Briefing: 54.39.136.7
Date: 2026-06-15
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**1. Core Profile**
- Risk Score: Moderate (40/100)
- Provider: OVH (ASN 16276)
- Organization: Ahrefs Pte Ltd (Hosting)
- Geolocation: Registered to Quebec, Canada, but geo-validation flags it as implausible (RTT anomalies suggest spoofed location).
- Network Role: Hosting provider (firewalled, no public services).
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**2. Threat Indicators**
- No direct malicious activity: No indicators of spam, attacks, or known campaigns.
- DNSBL Listings: Flagged by 1/8 blacklists (low severity).
- Subnet Abuse:
- 54.39.136.0/24 has high abuse density (0.54), with 138/254 sibling IPs classified as threats.
- Inherited Risk: 21/100 (substantial risk from subnet).
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**3. Observational Trends**
- Recent Activity:
- 2026-06-15: Subnet abuse density increased to 0.61 (high-risk classification).
- RTT Anomalies: Observed RTT of 27ms for a 5,629km distance (implausible).
- Historical Data:
- First observed on 2026-06-09, with consistent low-confidence geo-validation.
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**4. Relationships & Dependencies**
- Linked Hostnames:
- `proxy-ca002-san7.ahrefs.net` (Ahrefs infrastructure).
- Network Relationships:
- Shares subnet with 139/254 sibling IPs, 138 of which are flagged as threats.
- Provider Context:
- OVH customer (OVH-CUST-281059681) with no abuse history.
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**5. Recommendations**
- Monitor Subnet: High abuse density in 54.39.136.0/24 warrants closer scrutiny.
- Verify Geolocation: Investigate spoofed RTT values to confirm true location.
- Block/Restrict: Consider firewall rules to block traffic from this subnet if risk thresholds are exceeded.
- DNS Monitoring: Track `proxy-ca002-san7.ahrefs.net` for unusual behavior.
Next Steps: Cross-reference with internal threat intel and monitor for lateral movement or increased activity.
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*Generated by IPDebrief – Cybersecurity Threat Intelligence*
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-281059681 |
| CIDR Block | 54.39.136.0/24 |
| RIR | ARIN |
| Country | Singapore |
| Abuse Contact | — |
🌐 DNS Intelligence
| PTR | proxy-ca002-san7.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca002-san7.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 | 33% | 2 | 4 |
| routing | 27% | 2 | 3 |
| services | 15% | 2 | 2 |
| ownership | 37% | 3 | 5 |
| reputation | 28% | 1 | 3 |
| geolocation | 33% | 2 | 3 |
| Overall | 29% | 12 | 20 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-21 21:01:07 UTC |
| Last Seen | 2026-06-28 16:37:18 UTC |
| Profile Built | 2026-06-29 04:43:04 UTC |
| Data Freshness | Live |
| Signal Types | 24 |
| Total Observations | 28 |
Full dossier details are available via our API.