Network diagnostics

Capture and inspect network packets to check connections and diagnose network errors.

Programs in this category

9 tools

Angry IP Scanner

inventory an authorized local network, select address ranges, interpret results and understand reachability checks.

Network diagnostics · Windows, macOS, Linux

Fiddler Everywhere

Debug HTTP and HTTPS in Fiddler Everywhere, filter sessions and handle captured data safely.

Network diagnostics · Windows, macOS, Linux

HTTP Toolkit

Debug HTTP requests from your application. Select a traffic source, find a request and inspect its response.

Network diagnostics · Windows, macOS, Linux

Microsoft Sysinternals TCPView

official download and a guide to interpreting Windows processes, TCP and UDP addresses, and connection states.

Network diagnostics · Windows

OpenSnitch

See outbound connections from Linux applications and create rules for specific processes and destinations.

Network diagnostics · Linux

PingPlotter

Measure latency and packet loss over time to investigate intermittent connection problems.

Network diagnostics · Windows, macOS

Portmaster

Portmaster for Windows and Linux: official downloads, app connections, access rules, block verification and how it differs from SPN.

Network diagnostics · Windows, Linux

Wireshark

analyze your network traffic, choose an interface and filters, read captures and handle PCAP files safely.

Network diagnostics · Windows, macOS, Linux

Zenmap

the official graphical interface for Nmap, scan profiles, result interpretation and checks within authorized network ranges.

Network diagnostics · Windows, macOS, Linux

How to choose a tool

Start with a specific question and a short, reproducible test. Record the network interface and the observation time. Captures can contain secrets and other people’s data. Share only the minimum excerpt you have checked.

Checks before use

Open an overview of the selected program: there is a link to the official distribution, the start of work and restrictions. First check the script on the test data, then configure the copies and restore. A description of the feature does not mean that it works the same in every version or on each platform.

Other tasks

All tool categories · Sign-in security: passkeys, TOTP and SMS · How to verify a support request