15.235.27.71📋 Copy

# IP Intelligence Briefing: 15.235.27.71/32

## Executive Summary

IP address 15.235.27.71 is classified as Moderate Risk (Score: 40) and operates within OVH's cloud infrastructure. While the IP itself shows no direct threat indicators, it resides in a subnet with high abuse density (0.707) containing 181 threat-sibling IPs. The address resolves to Ahrefs infrastructure (proxy-ca013-san71.ahrefs.net) but presents geolocation inconsistencies that warrant monitoring.

## Technical Profile

## Geolocation Analysis

Multiple geolocation sources report conflicting data:

• Primary Report: Singapore (CA country code)
• Secondary Report: US (latitude: 37.751, longitude: -97.822)
• Validation Status: FAILED — RTT measurements (27-28.8ms) are inconsistent with reported distances (6,082km minimum possible RTT: 121.6ms). This indicates potential geolocation spoofing or data quality issues.

## Threat Indicators

• Blacklist Count: 0
• Known Attacker: No
• Spam Source: No
• Tor Exit Node: No
• Direct Threat Indicators: None detected
• Known Campaigns: None

## Neighborhood Context (15.235.27.0/24)

The subnet exhibits elevated risk characteristics:

• Abuse Density: 0.707 (HIGH)
• Total Siblings: 256
• Active Siblings: 223
• Threat Siblings: 181
• Inherited Risk Score: 28
• Risk Distribution: 0 high, 64 medium, 36 low

## Observation History

21 observations recorded through June 2026. Key recent signals include:

• 2026-06-28: DNS resolution confirmed for ahrefs.net
• 2026-06-20: Subnet classified as "high_abuse" with 181 threat siblings
• 2026-06-20: Alienvault OTX flagged ASN AS16276 with threats (5 pulse matches)
• 2026-06-20: Geolocation data inconsistent (CA/US reports with low confidence)

## Network Relationships

40 relationships identified, primarily network-level associations:

• Primary Network: OVH-CUST-281059692
• Control Plane: Route stable: No (route changes detected)
• BGP Prefix: 15.235.0.0/17

## Recommended Security Actions

Firewall Rules

```bash

# iptables

iptables -A INPUT -s 15.235.27.71 -j DROP

# nftables

nft add rule inet filter input ip saddr 15.235.27.71 drop

# nginx

deny 15.235.27.71;

```

WAF/CDN Integration

• Cloudflare WAF: Block IP with description "IPDebrief risk score 40"
• AWS WAF: Add 15.235.27.71/32 to block list

SOC Analyst Notes

1. Monitor, Don't Block Immediately: While the IP has no direct threat indicators, the high-abuse subnet context (0.707 density) suggests elevated risk. Consider blocking at perimeter level but maintain logging for analysis.

2. Geolocation Validation Required: Conflicting geolocation data with RTT violations indicates potential spoofing. Correlate with other intelligence sources.

3. Subnet-Level Awareness: 181 sibling IPs flagged as threats in the same /24. Consider evaluating broader subnet filtering policies.

4. Infrastructure Legitimacy: PTR hostname (proxy-ca013-san71.ahrefs.net) indicates association with Ahrefs SEO tools infrastructure. Verify business context before enforcement actions.

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*Report generated: 2026-06-28*

*Intel Level: Moderate Risk*

*Recommended Action: Monitor and evaluate subnet context*

This summary was generated by AI and may contain inaccuracies. Verify critical details independently.