I am not much of a network person, but I understand that (IPv4) addresses can be written in a format like
127.0.0.1/16. I tried reading through Wikipedia's IPv4 subnetting reference, Subnetwork and CIDR_notation - but it's way too much detail than I need.
I, essentially, don't need to understand CIDR notation for now - all I want is a command line tool, where I can type something like
127.0.0.1/16, and see what addresses it matches.
Is there a command line tool I can use for the purpose?