[root@localhost ~]# ipcalc -p 192.168.2.1 255.255.255.0
PREFIX=24
[root@localhost ~]# ipcalc -n 192.168.2.1 255.255.255.0
NETWORK=192.168.2.0
[root@localhost ~]# ipcalc -h 127.0.0.1
hostname=localhost.localdomain
[root@localhost ~]# ipcalc -m 192.168.2.1
NETMASK=255.255.255.0
[root@localhost ~]# ipcalc -pnbm 192.168.2.1 255.255.255.0
NETMASK=255.255.255.0
PREFIX=24
BROADCAST=192.168.2.255
NETWORK=192.168.2.0