Windows
Telnet is an application available as Windows feature which is not installed by default. In order to install this program please run the cmd.exe console ("C:\Windows\System32\cmd.exe") as root (right click on cmd.exe and choose "Run as administrator") and paste the following command (right click inside the console to paste):
dism /online /Enable-Feature /FeatureName:TelnetClient
You should see the following message after successful completion:
(c) Microsoft Corporation. All rights reserved.
C:\WINDOWS\system32>dism /online /Enable-Feature /FeatureName:TelnetClient
Deployment Image Servicing and Management tool
Version: 10.0.19041.844
Image Version: 10.0.19044.1706
Enabling feature(s)
[==========================100.0%==========================]
The operation completed successfully.
C:\WINDOWS\system32>
Linux/MacOS
Please run the following comma
nd in the Linux shell to install Telnet (requires root access):
sudo apt-get install telnet