Telnet is a protocol that enables you to connect to remote computers and local computers over a TCP/IP network, over TCP port 23. By default in Windows 10 and 8, Telnet is disabled in recent Windows environments.
To enable Telnet command line utilities: Click Start > Control Panel. Click Programs and Features
Open and Windows 10 Telnet
Here is quick how to open Windows 10 Telnet
2. Click Turn Windows Features on or off
3. Now new Windows Menu will pop out , Find the Telnet Features and check the box and click OK to apply. Restart computer if required.