15.235.27.231
IP INTELLIGENCE BRIEFING: 15.235.27.231/32
EXECUTIVE SUMMARY
IP address 15.235.27.231 is assigned to OVH infrastructure (ASN 16276, Organization: Dmytro, Ahrefs Pte Ltd) within the 15.235.27.0/24 subnet. The IP carries a moderate risk score of 50 and shows evidence of DNSBL listings. The subnet exhibits high abuse classification with 66.02% abuse density.
OWNERSHIP & INFRASTRUCTURE
- ASN: 16276 (OVH)
- Network Block: 15.235.27.0/24
- Infrastructure Type: Cloud/Hosting environment
- Service Status: Firewalled / No Services detected (no open ports, no TLS certificates)
- DNS Resolution: proxy-ca013-san231.ahrefs.net (ahrefs.net domain)
- Geolocation: Singapore (geo validation flagged—RTT discrepancy of 6,082km with minimum possible 121.6ms)
THREAT INDICATORS
- Risk Score: 50 (Moderate Risk)
- DNSBL Status: Listed on 2 of 8 threat feeds
- Threat Indicators: None directly attributed to this IP
- Campaign Affiliation: None detected
- Known Attacker/SpamSource: Not flagged
NEIGHBORHOOD ANALYSIS
The 15.235.27.0/24 subnet shows elevated risk characteristics:
- Active Siblings: 219 of 256 IPs active
- Threat Siblings: 169 IPs flagged as threats
- Abuse Density: 0.6602 (High Abuse Classification)
- Inherited Risk: 26
- Risk Distribution: 100 medium-risk IPs detected in neighborhood
OBSERVATION HISTORY
Recent signal activity (22 total observations) indicates:
- Most recent probe: 2026-06-26T02:12:49Z
- DNSBL listing detected with high severity
- Cloud infrastructure confirmed
- Ahrefs.net domain association
- Operator score: 0.2174 (Minimal)
- Route stability: False (dynamic BGP routing)
NETWORK CLASSIFICATION
- Provider: OVH (cloud hosting provider)
- Connection Type: CloudCompute
- Is Residential: No
- Is Proxy/VPN/Tor: No
- Is AnyCast: No
RECOMMENDED SECURITY ACTIONS
The following rules are recommended based on the risk profile:
- iptables: `iptables -A INPUT -s 15.235.27.231 -j DROP`
- nftables: `nft add rule inet filter input ip saddr 15.235.27.231 drop`
- nginx: `deny 15.235.27.231;`
- pfSense: Add 15.235.27.231/32 to block list
- Cloudflare WAF: Block IP with expression `ip.src eq 15.235.27.231`
- AWS WAF: Configure rule for CIDR `15.235.27.231/32`
INTELLECUAL NOTE
The IP resolves to the ahrefs.net domain but shows no active web services. The geo-location discrepancy (Singapore reporting vs. actual network location) suggests potential routing manipulation or geolocation data inconsistency. The subnet's high abuse density warrants consideration of blocking the entire /24 block if organizational policy permits, though this may impact legitimate ahrefs.net services.
END OF BRIEFING
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-281059692 |
| CIDR Block | 15.235.27.0/24 |
| RIR | ARIN |
| Country | Singapore |
| Abuse Contact | — |
🌐 DNS Intelligence
| PTR | proxy-ca013-san231.ahrefs.net |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | proxy-ca013-san231.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 | 30% | 2 | 4 |
| routing | 13% | 1 | 1 |
| services | 12% | 2 | 2 |
| ownership | 15% | 2 | 2 |
| reputation | 28% | 1 | 3 |
| geolocation | 33% | 2 | 3 |
| Overall | 22% | 10 | 15 |
| Data Coherence | Mixed Signals (60%) — 2 contradiction(s) |
| Attribution | Very Low (20%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
⚠ Geo sources disagree on country: US, CA
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-10 16:14:00 UTC |
| Last Seen | 2026-06-27 17:48:56 UTC |
| Profile Built | 2026-06-28 11:54:10 UTC |
| Data Freshness | Live |
| Signal Types | 22 |
| Total Observations | 28 |
Full dossier details are available via our API.