Telnet is a very useful command for server administrators.

To install telnet on

Windows Server 2016

Run on power shell.

Install-WindowsFeature -name Telnet-Client

On command promt, run

dism /online /Enable-Feature /FeatureName:TelnetClient

Windows Server 2012

pkgmgr /iu:"TelnetClient"

RHEL/CentOS

yum install telnet

Ubuntu/Debian

apt install telnet