Knocker

Knocker: Free & Open-Source Port Scanning Tool

A free and open-source port scanning tool for Linux, helping system administrators identify security vulnerabilities or misconfigurations by easily checking open network ports on a server.

What is Knocker?

Knocker is an open-source network port scanner designed for Linux systems. It provides a simple command-line interface that system administrators can use to quickly scan servers or other devices on a network to determine what TCP and UDP ports are open.

Unlike more full-featured port scanners like Nmap, Knocker is lightweight and designed specifically for port scanning rather than general network discovery. It has very few dependencies, making it easy to install on most Linux distributions.

Some key features of Knocker include:

• Ability to customize target ports rather than scanning all 65,535 ports
• TCP connect, TCP ACK, and UDP scanning types
• Option to determine open ports without actively scanning using netstat
• Support for network ranges via CIDR notation
• Easy-to-read command-line output

Since open ports can indicate vulnerabilities or misconfigured services on a target server or device, Knocker provides an easy way for system admins to audit their machines and close down potential attack vectors. Its targeted approach and specificity to port scanning makes it a useful open source alternative to heavier port scanners.

Knocker Features

Official Links