5.39.1.251📋 Copy

IP INTELLIGENCE BRIEFING

Target IP: 5.39.1.251/32

Date: 2026-06-23

Analyst: IPDebrief Intelligence Team

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EXECUTIVE SUMMARY

IP 5.39.1.251 presents a Moderate Risk profile (Risk Score: 50) operating from OVH cloud infrastructure in France. While not directly associated with active malicious campaigns, the IP resides within a subnet exhibiting elevated abuse density (0.8438/1.0), with 27 of 32 neighboring IPs classified as threats. The host resolves to proxy infrastructure for ahrefs.net.

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OWNERSHIP & GEOLOCATION

• Organization: Ahrefs Pte Ltd Dmytro
• ASN: 16276 (OVH)
• Country: France (FR)
• Infrastructure Type: Cloud Compute
• PTR Hostname: proxy-fr005-san251.ahrefs.net

The IP is registered to Ahrefs, a legitimate SEO analytics provider. The hostname indicates this endpoint serves as a proxy node (proxy-fr005) within the Ahrefs network architecture.

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THREAT INDICATORS

• Known Campaigns: None detected
• Blacklist Status: 0 direct blacklist matches
• DNSBL Listings: 1 of 8 threat feeds flagged
• Tor/Proxy: Not a Tor exit node, not classified as proxy infrastructure
• Abuse Confidence: Not elevated

However, the subnet environment shows concerning activity patterns with multiple flagged neighbors.

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NETWORK NEIGHBORHOOD ANALYSIS

Subnet: 5.39.1.0/24

• Abuse Density: 0.8438 (High)
• Threat Classifications: 27 of 32 IPs flagged
• Active Threat Siblings: 13
• Inherited Risk Score: 33

The /24 subnet demonstrates concentrated abuse activity. Multiple neighboring IPs (5.39.1.227, 5.39.1.233, 5.39.1.240) carry risk scores of 65. This environment suggests potential lateral movement or coordinated infrastructure usage.

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OBSERVATION HISTORY

Analysis of 22 historical observations reveals:

• Recent subnet abuse density: 0.5312 (High)
• DNS listing activity: 8 total lists, 2 current listings (maximum severity: High)
• Operator score: Minimal (0.087-0.2174)
• No persistent malicious behavior detected

The IP has not exhibited sustained malicious activity but shows intermittent DNS-based listing events.

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SERVICE ENUMERATION

• Open Ports: None detected
• HTTP Services: None detected
• TLS Certificates: None detected
• Classification: Firewalled / No Services

The IP appears to be a passive endpoint with no active service enumeration.

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RECOMMENDED ACTIONS

Firewall Rules (Immediate):

• iptables: `iptables -A INPUT -s 5.39.1.251 -j DROP`
• nftables: `nft add rule inet filter input ip saddr 5.39.1.251 drop`
• nginx: `deny 5.39.1.251;`
• pfSense: Block 5.39.1.251/32
• Cloudflare WAF: Block IP with risk score 50
• AWS WAF: Add 5.39.1.251/32 to blocklist

Extended Mitigation:

• Consider blocking the entire 5.39.1.0/24 subnet given the 0.8438 abuse density
• Monitor for lateral movement from related threat IPs in the neighborhood
• Review logs for any prior interactions with high-risk neighbor IPs (5.39.1.227, 5.39.1.233, 5.39.1.240)

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INTELLIGENCE ASSESSMENT

This IP represents low individual threat but operates within a high-abuse subnet. The ahrefs.net association suggests legitimate infrastructure use, but the neighborhood context warrants defensive blocking. Monitor for escalation in listing activity or emergence of new threat indicators from the /24 subnet.

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