The word “telnet” often refers to the Telnet client, since the command to run the client has the same name as the protocol. This page is about the telnet client which we use in this guide to test and debug servers.

Telnet is a computer protocol that was built for interacting with remote computers ([IETF RFC-854]:

Telnet utility allows users to test connectivity to remote machines and issue commands through the use of a keyboard, and one of the simplest ways to check if a port is open and listening on a network.

How to install

Debian / Ubuntu Linux

sudo apt-get update && sudo apt-get install telnet

Fedora, CentOS, RedHat

sudo yum install telnet

Mac Homebrew

brew install telnet


Install for CMD or PowerShell