Is IP address 81.172.190.123 dangerous?

81.172.190.123 presents moderate risk with a threat level of 4/10. While not critically dangerous, it has been associated with activity. Monitoring and conditional blocking is recommended.

Who owns or operates IP address 81.172.190.123?

IP address 81.172.190.123 is operated by DELTA Fiber Nederland B.V. (ASN 15435) and is geolocated to NL. This information is derived from public WHOIS and geolocation databases.

Should I block IP address 81.172.190.123?

Blocking 81.172.190.123 is advisable for security-sensitive environments. With a threat level of 4/10, consider implementing conditional blocks or rate limiting.

How accurate is this threat assessment for 81.172.190.123?

Our threat assessment for 81.172.190.123 has a confidence score of 27%, based on 2 independent reports from multiple independent sources. Higher confidence scores indicate more reliable assessments.

IP Address

81.172.190.123

IPv4 Public

AS15435

DELTA Fiber Nederland B.V.

2 Reports

Is this your IP address? If the cause is fixed, you can request removal. Free of charge, usually decided within 48 hours. Request delisting

The Netherlands Location

DELTA Fiber Nederland B.V... ASN 15435

2 Reports

Honeypot Data Source

Moderate Risk

IP 81.172.190.123 presents moderate risk (4/10) with 2 security reports.

Some concerning behavior detected. Confidence: 27%.

More threatening than 3% of monitored IPs

Threat Categories

Email Spam 2

Technical Details

Email spam involves mass distribution of unwanted emails, often for advertising, phishing, or malware delivery.

Recommended Mitigations

Implement SPF, DKIM, DMARC, and use reputable email filtering services.

Behavioral Analysis

Activity Pattern: Consistent Activity

Steady malicious activity over 1 week indicates persistent threat actor operations.

First Observed 22. September 2026

Last Activity 29. September 2026

Recent (7 days) 0 incidents

High-Risk Network Association

This IP belongs to a network (ASN 15435) with elevated threat levels. The ISP DELTA Fiber Nederland B.V. hosts multiple reported malicious addresses, suggesting systemic security issues or permissive policies.

Network-wide patterns may indicate this is part of a larger malicious infrastructure.

Security Recommendations

Standard monitoring recommended. Apply conditional access controls as needed.

Long-term blocking recommended.

Reputation Summary

Threat Level 4/10 Low

Medium

Activity Frequency 0/10 Inactive

Confidence Score 27% Medium Confidence

Confidence History

22. Sep 2026 - 29. Sep 2026

27% Current

Stable Trend

Date	Categories	Source	Confidence
29. Sep 2026	Email Spam	Honeypot	75%
22. Sep 2026	Email Spam	Honeypot	75%

Basic Information

IP Address: 81.172.190.123
IP Version: IPv4
Network Type: Public
Tor Network: No
Network Class: Class A

Geolocation

Country: NL
ASN: AS15435
ISP: DELTA Fiber Nederland B.V.

DNS Information

Reverse DNS: host-7l.gry-ldc1d3-a.v4.dfn.nl
PTR Record: Yes
Connection Type: Static

Statistics

Total Reports: 2
First Reported: 22 Sep 2026
Last Reported: 29 Sep 2026, 17:00

Network Reputation

Analysis of the entire network (ASN) that this IP address belongs to, providing context about the hosting provider and network-wide threat patterns.

Network Identity

ASN: AS15435

Organization: DELTA Fiber Nederland B.V.

Country:

Network Threat Assessment

10/10

This network has a high threat level with significant malicious activity reported across multiple IPs.

Network Statistics

Total IPs Monitored

Total Reports

Reports per IP

Network Context

This IP address belongs to DELTA Fiber Nederland B.V. (AS15435), which manages 1 IP addresses in our monitoring system. Out of these, 2 have been reported for suspicious activities, resulting in a network-wide threat level of 10/10.

Network warning: This network has elevated threat levels. Exercise caution when interacting with IPs from this ASN.

Comparative Analysis

How this IP compares to others in our threat intelligence database

3 %

Global Threat Ranking

This IP is more threatening than 3% of all IPs in our database.

Low Threat Percentile

Global Comparison

Compared against 853,739 reported IPs worldwide

Threat Level 4/10 avg: 6.3 -

Total Reports 2 avg: 9 --

Network Comparison

Compared against 42 IPs in ASN 15435

Threat Level 4/10 network avg: 6.3 -

Total Reports 2 network avg: 1 ++

Network DELTA Fiber Nederland B.V. has overall threat level 10/10

Geographic Comparison

Compared against 18,351 IPs in NL

Threat Level 4/10 country avg: 6.3 -

Total Reports 2 country avg: 30 --

Daily report activity over the last 30 days showing patterns and peaks.

Peak Day 22 Sep 2026 1 reports

Daily Average 0.1 reports/day

Most Active Tuesday 2 reports

Evolution of threat level over time based on reported categories and frequency.

Initial Threat 3/10

Current Threat 3/10

Distribution of threat categories reported over time.

Top Threat Categories

Email Spam 2

Activity patterns showing when this IP is most active during the day and week.

Hourly Activity

Peak activity at 17:00 with 1 reports

Weekly Activity

Geographic Threat Distribution

775,944 threat incidents tracked globally • Last 24h: 31,511 Logs

FEED

Top Threat Sources

01

United States US

151,457 19.5%
02

Brazil BR

113,120 14.6%
03

India IN

90,461 11.7%
04

China CN

46,795 6%
05

SC SC

29,270 3.8%
06

Germany DE

18,948 2.4%
07

Pakistan PK

18,521 2.4%
08

Netherlands NL THIS IP

18,354 2.4%
09

Argentina AR

16,766 2.2%
10

Indonesia ID

15,443 2%

+40 more countries

THREAT LEVEL

LOW MED HIGH

IPs from the same Autonomous System (AS) network provider.

20 Related IPs

5.9/10 Avg Threat

18% Avg Confidence

5 High Threat

Elevated risk: Multiple related IPs are flagged

Moderate Risk

Threat Categories

Technical Details

Recommended Mitigations

Behavioral Analysis

High-Risk Network Association

Security Recommendations

Basic Information

Geolocation

DNS Information

Statistics

Network Reputation

Network Identity

Network Threat Assessment

Network Statistics

Network Context

Global Threat Ranking

Top Threat Categories

Hourly Activity

Weekly Activity

FEED

Top Threat Sources

JSON Report

Firewall Rules

iptables / netfilter

UFW (Ubuntu)

Windows Firewall

Cloudflare

nginx

Apache .htaccess

PDF Report

Analyzed high-risk IP addresses