15.235.98.136📋 Copy

# IPDEBRIEF THREAT INTELLIGENCE BRIEFING

## Target: 15.235.98.136/32

Classification: Moderate Risk (Score: 40) | Date: 2026-06-20

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EXECUTIVE SUMMARY

IP 15.235.98.136 is a cloud-hosted infrastructure address operated by OVH (AS16276) on behalf of Ahrefs Pte Ltd. The IP shows moderate risk characteristics with no direct malicious indicators but operates within a high-abuse density subnet. Recommended action: Monitor with defensive blocking if required.

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OWNERSHIP & INFRASTRUCTURE

Note: DNS PTR record resolves to `proxy-ca019-san136.ahrefs.net`, indicating association with Ahrefs web infrastructure.

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GEOLOCATION ANALYSIS

Assessment: Geolocation data shows inconsistency between sources. IP resolves to Singapore regionally but reported as CA in some feeds.

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THREAT POSTURE

Operator Score: 0.2174 (Minimal Risk)

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NEIGHBORHOOD ANALYSIS

Subnet: 15.235.98.0/24

Neighbor Risk Distribution: 100 Medium Risk, 0 High/Low

Assessment: The /24 subnet shows elevated abuse density. 160 of 230 active siblings flagged as threat-related. This suggests the subnet may host compromised endpoints or be used for bulk malicious operations.

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OBSERVATION HISTORY (Last 20 Signals)

Most Recent (2026-06-20):

• Provider: OVH
• Infrastructure: Cloud Compute
• Hosting: Confirmed

2026-06-15:

• Subnet Classification: High Abuse (0.625 density)
• AlienVault OTX: US-based, 1 threat pulse detected
• Operator Score: Minimal (0.25)

Temporal Analysis: No ownership changes detected. Threat observation count: 1. Not persistently malicious.

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SECURITY ACTIONS

Recommended Firewall Rules:

```bash

# iptables

iptables -A INPUT -s 15.235.98.136 -j DROP

# nftables

nft add rule inet filter input ip saddr 15.235.98.136 drop

# nginx

deny 15.235.98.136;

# pfSense

15.235.98.136/32

```

Cloud Provider Recommendations:

• Cloudflare WAF: Block with expression `ip.src eq 15.235.98.136`
• AWS WAF: Add address `15.235.98.136/32` with description "IPDebrief risk 40"

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INTELLIGENCE ASSESSMENT

Risk Level: Moderate-Actionable

Key Findings:

1. No direct evidence of malicious activity from this specific IP

2. High-abuse subnet context warrants monitoring

3. Ahrefs infrastructure association suggests legitimate web traffic potential

4. DNSBL listing indicates some reputation issues

Recommendation: Implement defensive blocking if the IP is observed in threat intelligence feeds or generating suspicious traffic. Consider blocking the entire /24 subnet if operational risk tolerance permits, given the 0.625 abuse density.

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Report Generated: IPDebrief Intelligence Platform

Data Sources: 6 dimensions, 12 total observations

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