"telnet" is not recognized as internal or external command, operable program or batch file

In latest windows operating systems like Windows 2008 Server, 2012 Server, Windows 8, Windows 7, etc "telnet" is not preinstalled with windows, so you need to install the telnet client manually.

Installing Telnet Client in Windows Server 2008 R2, 2012 server.
"Start" -> "Administrative Tools" -> "Server Manager" -> "Features" -> and click "Add Features" -> select "Telnet client" and click "Next" -> "Install".

Installing Telnet Client on Windows using commands
The below command will install and enable telnet client in windows operating systems.
C:\Users\Administrator>pkgmgr /iu:"TelnetClient"

LABELS: extra-tips, telnet, Windows, Windows-Commands