subnet membership
$ ./in_cidr.sh 10.0.0.100 10.0.0.0/24
167772260 ip as decimal
167772160 network as decimal
4294967040 mask
in network!
$ ./in_cidr.sh 10.0.0.100 10.0.0.0/25
167772260 ip as decimal
167772160 network as decimal
4294967168 mask
in network!
$ ./in_cidr.sh 10.0.0.100 10.0.0.0/26
167772260 ip as decimal
167772160 network as decimal
4294967232 mask
$ ./in_cidr.sh 10.0.0.100 10.0.0.0/27
167772260 ip as decimal
167772160 network as decimal
4294967264 mask