knocker

Simple and easy to use TCP security port scanner

Platforms: Linux · Last verified September 6, 2026

Knocker is a new, simple, and easy to use TCP security port scanner written in C, using threads. It is able to analyze hosts and the network services which are running on them.

Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.

Getting started

Install on Kali Linux with `sudo apt install knocker`. See the official Kali tool page and upstream homepage linked above for full usage and configuration details.

Commonly preinstalled on

Kali Linux

Debian-based distribution built for penetration testing and security auditing