Unixcop published a tutorial about using the Ncat command.

Ncat Linux command

Knowing the Linux terminal and its commands is a basic task of any sysadmin or DevOps. Therefore it is always good from time to time to know new commands and their utilities. This will allow us to have new functions that can solve a problem at any time. 

Ncat Linux command - Unixcop the Unix / Linux the admins deams