What is telnet

telnet is a commandline tool prividing bidirectional interactive text-oriented communication facility using a virtual terminal connection.

telnet is both a protocol, and a commandline tool.

Because on its insecure nature, the only acceptable usecase for using telnet is a direct cable connection to a router or a switch. telnet allows to perform administration tasks on a router or a switch.

telnet usage

Starting from Windows 10, telnet is disabled on Windows systems. In order to enable it:

Dism /Online /Enable-feature /FeatureName:TelnetClient

Basic usage:

telnet <domain name or IP address> <port number>