51.89.129.76📋 Copy

IP INTELLIGENCE BRIEFING: 51.89.129.76

EXECUTIVE SUMMARY

The IP address 51.89.129.76 is a moderate-risk (risk score 40) infrastructure IP belonging to Ahrefs Pte Ltd Dmytro, hosted on OVH Cloud (ASN 16276) in London, GB. The address operates within a high-abuse subnet (51.89.129.0/24) with 0.668 abuse density. No active threat indicators were detected, but contextual risk factors suggest defensive blocking is warranted.

INFRASTRUCTURE PROFILE

The IP resolves to hostnames proxy-uk008-san76.ahrefs.net and operates within a cloud compute environment. No services are currently running on the address (firewalled/no services detected). The infrastructure is classified as hosting infrastructure with stable network characteristics. The IP maintains valid DNSSEC, CAA records, and passes geo-validation checks.

THREAT ASSESSMENT

Current threat indicators show no active malicious activity:

• Not identified as a known attacker
• Not a Tor exit node
• Not a known spam source
• Blacklist count: 0
• DNSBL: Listed on 1 of 8 threat feeds

However, the inherited risk from the subnet contributes 26 points to the overall risk score. The address shows minimal operator score (0.2174) across recent observations.

SUBNET CONTEXTUAL RISK

The /24 subnet (51.89.129.0/24) exhibits elevated abuse characteristics:

• Total siblings: 256
• Active siblings: 170
• Threat siblings: 171
• Risk distribution across sampled neighbors: 100 medium-risk instances (risk score 40)
• Classification: high_abuse
• Inherited risk score: 26

OBSERVATION HISTORY

Analysis of 25 signal observations reveals:

• Consistent operator score of 0.2174 ("Minimal")
• No persistent malicious activity detected
• Single threat observation recorded
• Stable ownership over time

RECOMMENDED ACTIONS

Based on the moderate risk profile and high-abuse subnet context, the following defensive measures are recommended:

Firewall Rules:

• iptables: `iptables -A INPUT -s 51.89.129.76 -j DROP`
• nftables: `nft add rule inet filter input ip saddr 51.89.129.76 drop`
• nginx: `deny 51.89.129.76;`

WAF/Cloud Platform Rules:

• Cloudflare WAF: Block with expression `ip.src eq 51.89.129.76`
• AWS WAF: Add address `51.89.129.76/32` to rule set with description "IPDebrief risk 40"
• pfSense: 51.89.129.76/32

INTEL NOTE: While the IP shows no active threat indicators, the high-abuse subnet context and moderate risk score warrant blocking. This is a defensive measure based on contextual risk rather than confirmed malicious activity.

SOC TEAM: Monitor for any changes in threat indicators or subnet-wide abuse patterns.

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