51.89.129.218📋 Copy

# IP INTELLIGENCE BRIEFING

Subject: 51.89.129.218/32

Classification: Cloud Infrastructure / Hosting

Date: 2026-06-26

Analyst: IPDebrief Intelligence

---

## EXECUTIVE SUMMARY

51.89.129.218 is a cloud-compute infrastructure IP assigned to Ahrefs Pte Ltd Dmytro, operated through OVH network infrastructure (ASN 16276). The IP resolves to a legitimate ahrefs.net hostname but exhibits DNSBL listings and moderate neighborhood abuse density. No active services detected on the target IP.

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## INFRASTRUCTURE PROFILE

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## THREAT INDICATORS

DNSBL Status: Listed on 1 of 8 threat feeds

Active Threat Indicators: None detected

Known Campaigns: No matches

Tor Exit/Proxy: Negative

Spam/Attacker Source: Negative

Notable: The IP maintains a forward resolution count of 1 but shows no forward-confirmed status, indicating potential DNS inconsistency.

---

## NEIGHBORHOOD ANALYSIS (51.89.129.0/24)

• Total Active Siblings: 207 / 256 IPs
• Abuse Density: 0.4141 (Mixed Classification)
• Risk Distribution: 0 High, 74 Medium, 26 Low
• Inherited Risk Score: 16

Observation: The target resides in a subnet with elevated abuse activity. While this specific IP shows low individual risk, 106 sibling IPs are classified as threats.

---

## OBSERVATION HISTORY

Total signals: 19 observations

Recent Signals (2026-06-26):

• Geolocation: GB (confidence: 0.28)
• Subnet abuse density: 0.4141 (confidence: 0.75)
• DNSBL listings: 1 high-severity listing (confidence: 0.85)
• DNS CAA records: Present (confidence: 0.80)
• Operator score: 0.087 (Minimal)

Temporal Indicators: No ownership changes detected. Threat persistence: 0 days.

---

## NETWORK RELATIONSHIPS

• Total Relationships: 58
• Network Affiliations: OVH_282347344 (multiple entries)
• Control Plane: BGP prefix 51.89.0.0/16 stable
• Route Changes (30d): 0

---

## RECOMMENDED ACTIONS

Firewall Rules:

```bash

# Block inbound connections to this IP

iptables -A INPUT -s 51.89.129.218 -j DROP

# Log and block subnet if false positives persist

iptables -A INPUT -s 51.89.129.0/24 -j LOG --log-prefix "BLOCK_AHREFS_NET: "

```

WAF Rules (Cloudflare/AWS):

```

# Block IP with 51.89.129.0/24 subnet

ip: 51.89.129.218, 51.89.129.0/24

action: block

```

Monitoring Recommendations:

1. Monitor for new services opening on this IP

2. Watch for DNSBL listing additions/removals

3. Correlate with other ahrefs.net infrastructure for lateral threat assessment

---

## ASSESSMENT

This IP represents legitimate Ahrefs infrastructure hosted on OVH cloud. However, the subnet exhibits moderate-to-high abuse density (0.4141), and the target IP carries one DNSBL listing. While individual risk is low (25), the neighborhood context suggests potential for abuse-related traffic. Recommend monitoring rather than immediate blocking unless specific threat activity is observed.

Confidence Level: High

Threat Priority: Low/Medium

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