Free and open first

Best Network Diagnostic Software in 2026

When troubleshooting a network, the right diagnostic depends on whether you need to investigate DNS, packet loss or a route between systems. Compared on DNS diagnostics, packet-loss analysis and path visualization, these tools offer different areas of focus. PingPlotter, DNSViz and Globalping are among the entries to consider. You can also compare deployment, command-line interface, supported platforms and target limit against your environment and workflow. Free-plan availability and paid-from pricing add cost context. Start with the network question you need to answer, then weigh the listed capabilities and platform fit.

37 apps
Research read 23 Sept 2026
How the order is worked out

1

Globalping

Free plan Open source APIExtensioniPhone+5

Globalping combines location-based network measurements with command-line, API, and third-party integration options. Consider the free test limits and credit cost when estimating ongoing use.

9.1 Free plan Visit site
2

iperf2

Free plan Open source AndroidLinuxMac+2

9.0 Free plan Visit site
3

RIPE Atlas

Free plan Open source APILinuxMac+2

RIPE Atlas provides public measurement data and credit-based custom tests across a global probe network. Its credit requirements and visibility of probe IP addresses are worth considering before use.

8.7 Visit site
4

DNSViz

Free plan APILinuxMac+2

DNSViz offers useful DNSSEC analysis through a web service and command-line suite. Its maintenance-mode limits matter if you need to revisit or save web results.

7.6 Open source Visit site
5

DNSViz Toolkit

Free plan LinuxMacSelf-hosted+1

DNSViz offers both web-based DNSSEC visualization and command-line diagnostics, with several output formats.

7.6 Free plan Visit site
6

Angry IP Scanner

Free plan LinuxMacWindows

Angry IP Scanner offers network scanning across three desktop platforms without an installation requirement, according to its maker.

7.5 Free plan Visit site
7

iperf3

Free plan APILinuxMac+1

Choose iperf3 if you need configurable IP bandwidth measurements, structured output, or a library for integration into other programs.

7.4 Free plan Visit site
8

HttpWatch

Free plan APIExtensionWindows

Choose HttpWatch if browser network logs, security diagnostics, and automated performance data collection fit your Windows workflow.

7.3 Free plan · paid from $625 Visit site
9

inSSIDer

Free plan AndroidMacWindows

inSSIDer helps users inspect nearby Wi-Fi networks, channel usage, connected devices, and configuration.

7.3 From $1,500 Visit site
10

NetSpot

Free plan AndroidiPhoneMac+1

NetSpot covers nearby-network inspection, wireless surveys, heatmaps, and predictive planning, with desktop offline use after activation.

7.3 Free plan · paid from $199 Visit site
11

Advanced IP Scanner

Free plan Windows

Advanced IP Scanner combines local network discovery with shared-folder access, remote-control support, and several connection tools.

7.2 Free plan Visit site
12

Advanced Port Scanner

Free plan Windows

Choose Advanced Port Scanner if you need a free Windows tool for scanning network ports and managing discovered computers on a LAN.

7.2 Free plan Visit site
13

Dipiscan

Free plan Windows

Dipiscan provides network scanning, machine lookup, route display, and change monitoring as freeware for specified Windows versions.

7.2 Free plan Visit site
14

HiPerConTracer

Free plan LinuxSelf-hosted

Choose HiPerConTracer for a free, GPL-licensed framework when you need detailed Ping and Traceroute measurement, result processing, and remote-node collection.

7.2 Open source Visit site
15

Nmap

Free plan LinuxMacSelf-hosted+1

Nmap combines discovery and scanning functions with scripting and companion tools. It is free for end users, while commercial redistribution requires separate OEM licensing.

7.2 Free plan Visit site
16

nPerf

Free plan AndroidAPIiPhone+5

Choose nPerf for connection checks across web, desktop, and mobile, with separate mobile browsing and streaming tests and a free service tier.

7.2 Free plan · paid from €2/yr Visit site
17

GPing

Free plan Windows

GPing provides a free, focused way to graph pings to a specified host on Windows. Its narrow scope and lack of warranty are worth noting.

7.1 Free plan Visit site
18

PingPlotter

Free plan APIiPhoneLinux+3

PingPlotter provides desktop monitoring and a centralized Cloud option, with alerts and analysis for troubleshooting.

7.1 Free plan · paid from $6.99/mo Visit site
19

Open Visual Traceroute

Free plan LinuxMacWindows

Open Visual Traceroute focuses on route visualization, with 3D and 2D maps plus Whois and DNS tools.

7.0 Free plan Visit site
20

netcat

Free plan Linux

Netcat provides a compact set of connection, diagnostic, and scripting functions at no cost.

6.9 Free plan Visit site
21

NETworkManager

Free plan Windows

Choose NETworkManager if you need a free Windows toolkit for network troubleshooting, remote access, and profile management.

6.8 Free plan Visit site
22

PingTester

Free plan WebWindows

PingTester combines command-based tests, address scanning, scheduling, and reporting in a Windows GUI. Its permanent free version may suit administrators who need these listed network checks.

6.8 Free plan Visit site
23

SystemTrayMenu

Free plan Windows

Pick SystemTrayMenu if you want a free Windows launcher with nested menus, configurable search hotkeys, and portable use.

6.5 Free plan Visit site
24

WhatRoute

Free plan Mac

WhatRoute offers a wide set of network diagnostics and monitoring tools at no charge. Check the macOS 14.6 minimum and elevated-access requirement for operations that need the privileged helper.

6.5 Free plan Visit site
25

WinMTR

Free plan Windows

WinMTR provides focused packet-loss and latency diagnostics in a portable Windows utility. Users needing path graphics or DNS-specific checks will need other tools.

6.5 Free plan Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

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