51.161.37.91

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🤖 Witness AIThis summary was generated by AI and may contain inaccuracies. Verify critical details independently.

INTELLIGENCE BRIEFING: 51.161.37.91/32

Assessment: Moderate Risk (Score: 40)

Classification: OVH Cloud Compute Infrastructure

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1. OWNERSHIP & GEOLOCATION

Organization: Dmytro, Ahrefs Pte Ltd (OVH-CUST-281059684)
ASN: 16276 (OVH)
Location: Montreal, QC, Canada
Infrastructure Type: Cloud Compute / Hosting
CIDR Block: 51.161.37.0/24

2. THREAT INDICATORS

Risk Score: 40/100 (Moderate)
DNSBL Status: Listed on 1 of 8 total blacklist sources
Known Threats: No active campaigns, not a known attacker
Tor/Proxy: Not a Tor exit node, not a proxy, not a VPN
Service Status: No open ports detected (Firewalled)

3. DNS & RESOLUTION

PTR Hostname: proxy-ca005-san91.ahrefs.net
Forward Resolution: Confirmed to afields.net domain
Email Authentication: No SPF/DMARC records configured

4. NETWORK CONTEXT

Subnet Classification: High Abuse (Density: 0.6484)
Threat Density: 166 threat siblings out of 256 active IPs in /24
Route Stability: False (Route changes detected)
BGP Prefix: 51.161.0.0/17

5. OBSERVATION HISTORY

Observations: 18 total signals
Last Observed: 2026-06-14
Signal Types: Geolocation, subnet classification, operator score, network classification, overall profile
Consensus: Moderate confidence across signals (0.35–0.90)

6. RELATIONSHIPS

Primary Entity: OVH-CUST-281059684 (Multiple network relationships)
Correlated Entities: 44 relationship links identified
Cert Matches: 0 certificate associations

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7. RECOMMENDED ACTIONS

IMMEDIATE:

Block at perimeter firewall: `iptables -A INPUT -s 51.161.37.91 -j DROP`
Apply to WAF rulesets (Cloudflare, AWS)

CONTEXTUAL NOTES:

IP is associated with Ahrefs web proxy infrastructure (legitimate hosting customer)
High-abuse subnet requires contextual filtering rather than blanket blocking
DNSBL listing suggests prior abuse activity on subnet
No services currently accessible (firewalled)

SOC ANALYSIS RECOMMENDATION:

Monitor for lateral movement from this IP if observed in internal logs. The high-abuse neighborhood context warrants enhanced logging on related IPs (51.161.37.x/24). Consider subnet-level rules for this /24 given the 0.6484 abuse density and 166 threat sibling count.

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

🌍 Geolocation

Country	🇨🇦 Canada
Region	QC
City	Montreal
Timezone	—
Latitude	43.63
Longitude	-79.37

🏢 Ownership & Registration

Organization	Dmytro, Ahrefs Pte Ltd
ASN	AS16276
Network Name	OVH-CUST-281059684
CIDR Block	51.161.37.0/24
RIR	ARIN
Country	Singapore
Abuse Contact	—

🌐 DNS Intelligence

PTR	proxy-ca005-san91.ahrefs.net
Forward Confirmed	No — PTR hostname does not resolve back to this IP (weak signal)
Forward Hostnames	`proxy-ca005-san91.ahrefs.net`

🔐 DNS Hygiene

Hygiene Score	40% (Fair)
SPF	Not configured
DMARC	Not configured
FCrDNS	Not verified
DNSSEC	Valid
CAA	Present

☁️ Network Classification

Infrastructure	Infrastructure / Datacenter
Service Purpose	Firewalled / No Services
Network Tier	Hosting — Infrastructure provider without advanced routing

CloudHosting

🔌 Services & Open Ports

Port	Service	Protocol	Banner
No open ports detected

Server	—
HTTP Title	—

🔐 TLS Certificate

🔒

No certificate

Issued by —

N/A

SANs	None
Valid From	—
Valid Until	—

🎯 Confidence Breakdown

Per-dimension confidence scores based on source diversity and data freshness

Dimension	Score	Sources	Observations
threat	26%	2	3
routing	13%	1	1
services	8%	1	1
ownership	19%	2	2
reputation	28%	1	3
geolocation	21%	2	2
Overall	19%	9	12

Coverage: 6/6 dimensions · Data sufficiency: sufficient

Data Coherence	Consistent (100%)
Attribution	Moderate (50%)
	OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid

📅 Observation Timeline 🔄 Live

First Seen	2026-05-08 11:10:40 UTC
Last Seen	2026-06-27 13:18:40 UTC
Profile Built	2026-06-28 07:24:45 UTC
Data Freshness	Live
Signal Types	19
Total Observations	24

🔍 19 signal types · 24 observations collected

This report is generated from 19+ independent intelligence signals including ownership records, DNS analysis, BGP routing, TLS certificates, port scanning, threat feeds, behavioral fingerprinting, and more.
Full dossier details are available via our API.

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ℹ️ About This Report

All data shown is publicly available network metadata — IP addresses do not reliably identify individuals. Assessments are probabilistic and should not be used as sole basis for access control decisions. To report an issue or request data review, contact admin@ipdebrief.com.

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