# IP INTELLIGENCE BRIEFING: 176.31.139.18
Date: 2026-06-22
Classification: Moderate Risk / High Abuse Neighborhood
Status: Active Threat Indicator
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## EXECUTIVE SUMMARY
IP address 176.31.139.18 is classified as Moderate Risk (Score: 40) and belongs to OVH hosting infrastructure (ASN: 16276) located in Roubaix, France. The IP is associated with the domain ahrefs.net and operates as a firewalled server with no open services. While the IP itself shows no direct malicious activity, it resides within a high-abuse subnet (176.31.139.0/24) with 75% abuse density.
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## INFRASTRUCTURE PROFILE
| Attribute | Value |
|---|---|
| **IP Address** | 176.31.139.18/32 |
| **Risk Score** | 40/100 |
| **ASN** | 16276 (OVH SAS) |
| **Organization** | Ahrefs Pte Ltd Dmytro |
| **Location** | Roubaix, France (FR) |
| **RIR** | RIPE |
| **DNS** | proxy-fr004-san18.ahrefs.net |
| **Service Status** | Firewalled / No Services |
| **Classification** | Hosting Infrastructure |
---
## THREAT INDICATORS
- Blacklist Status: Listed on 1 of 8 DNSBL feeds
- Threat Feeds: No direct threat indicators
- Campaign Association: None detected
- Known Attacker Status: Not flagged as known attacker
- Spam Source: Not identified
---
## NEIGHBORHOOD ANALYSIS
The IP resides within subnet 176.31.139.0/24, which exhibits high abuse density (0.75).
| Metric | Value |
|---|---|
| **Total Subnet Siblings** | 32 |
| **Active Siblings** | 22 |
| **Threat Siblings** | 24 |
| **Inherited Risk** | 30 |
| **Abuse Classification** | High Abuse |
Risk Distribution of Neighbors: All 31 neighboring IPs show medium risk scores (35-50), indicating a pattern of coordinated hosting infrastructure with elevated threat presence.
---
## OBSERVATION HISTORY
Total Observations: 34 signals detected
Recent Activity (2026-06-22):
- DNS Signals: CAA records validated for ahrefs.net domain
- Network Reputation: ASN 16276 (OVH) flagged with 6 threat pulses
- Operator Score: 0.3043 (Basic)
- Threat Persistence: Single observation event, not persistently malicious
---
## NETWORK RELATIONSHIPS
- Total Relationships: 54
- Primary Association: Same Network (OVH_282114229)
- Infrastructure Type: Hosting provider network
---
## RECOMMENDED ACTIONS
Based on risk profile analysis, the following security controls are recommended:
| Platform | Rule |
|---|---|
| **iptables** | `iptables -A INPUT -s 176.31.139.18 -j DROP` |
| **nftables** | `nft add rule inet filter input ip saddr 176.31.139.18 drop` |
| **nginx** | `deny 176.31.139.18;` |
| **pfSense** | `176.31.139.18/32` |
| **Cloudflare WAF** | Block with expression: `ip.src eq 176.31.139.18` |
| **AWS WAF** | Add address: `176.31.139.18/32` |
---
## ANALYST NOTES
1. Contextual Risk: While the IP itself shows no active malicious behavior, the high abuse density of the parent subnet warrants heightened scrutiny.
2. Infrastructure Pattern: The subnet shows consistent medium risk across all neighbors, suggesting legitimate hosting infrastructure with potential for misused accounts.
3. Geolocation Validation: Location data is plausible with 5 probe samples (avg RTT: 99.4ms).
4. Monitoring Priority: Medium โ consider blocking at perimeter, monitor for future activity changes.
---
*Report generated via IPDebrief intelligence platform. All data sourced from observed signals and threat feeds.*
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
๐ข Ownership & Registration
| Organization | Ahrefs Pte Ltd Dmytro |
| ASN | AS16276 |
| Network Name | โ |
| CIDR Block | 176.31.0.0/16 |
| RIR | RIPE |
| Country | โ |
| Abuse Contact | Available via RDAP |
๐ DNS Intelligence
| PTR | proxy-fr004-san18.ahrefs.net |
| Forward Confirmed | No โ PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-fr004-san18.ahrefs.net |
๐ DNS Hygiene
| Hygiene Score | 40% (Fair) |
| SPF | Not configured |
| DMARC | Not configured |
| FCrDNS | Not verified |
| DNSSEC | Valid |
| CAA | Present |
โ๏ธ Network Classification
| Infrastructure | Infrastructure / Datacenter |
| Service Purpose | Firewalled / No Services |
| Network Tier | Tier 3 โ Basic operator with some routing infrastructure |
๐ 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 | โ |
| HTTP Title | โ |
๐ TLS Certificate
| SANs | None |
| Valid From | โ |
| Valid Until | โ |
๐ฏ Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 31% | 2 | 4 |
| routing | 20% | 2 | 3 |
| services | 24% | 2 | 3 |
| ownership | 22% | 3 | 4 |
| reputation | 27% | 1 | 3 |
| geolocation | 30% | 2 | 3 |
| Overall | 26% | 12 | 20 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
๐ Observation Timeline ๐ Live
| First Seen | 2026-05-07 23:03:56 UTC |
| Last Seen | 2026-06-27 02:16:51 UTC |
| Profile Built | 2026-06-28 02:23:49 UTC |
| Data Freshness | Live |
| Signal Types | 27 |
| Total Observations | 33 |
Full dossier details are available via our API.