ipcalc – Network Subnet Calcualator Toolbox Essential

ipcalc is a Linux package that can automatically calculate the address, netmask, wildcard, network address, broadcast address and more.

It can be installed under Ubuntu with the command

apt install ipcalc

To use it is simple, for example to calculate the subnet for 192.168.0.0/25 we enter:

ipcalc -n 192.168.0.0/25

ipcalc -n 127.0.0.1/8
Address: 127.0.0.1 01111111. 00000000.00000000.00000001
Netmask: 255.0.0.0 = 8 11111111. 00000000.00000000.00000000
Wildcard: 0.255.255.255 00000000. 11111111.11111111.11111111
=>
Network: 127.0.0.0/8 01111111. 00000000.00000000.00000000
HostMin: 127.0.0.1 01111111. 00000000.00000000.00000001
HostMax: 127.255.255.254 01111111. 11111111.11111111.11111110
Broadcast: 127.255.255.255 01111111. 11111111.11111111.11111111
Hosts/Net: 16777214 Class A, Loopback

I enter -n to avoid colour formatting in my terminal window.