$ sudo apt-get update
$ sudo apt-get install libnet-cidr-perl 

libnet-cidr-perl is installed in your system.

Make ensure the libnet-cidr-perl package were installed using the commands given below,

$ sudo dpkg-query -l | grep libnet-cidr-perl *

You will get with libnet-cidr-perl package name, version, architecture and description in a table

libnet-cidr-perl package basic information: