Address (Host or Network) Netmask (i.e. 24) Netmask for sub/supernet (optional)
/ move to:
 

Bla

Address:     117.120.40.0          01110101.01111000.00101 000.00000000
Netmask: 255.255.248.0 = 21 11111111.11111111.11111 000.00000000
Wildcard: 0.0.7.255 00000000.00000000.00000 111.11111111
=>
Network:     117.120.40.0/21       01110101.01111000.00101 000.00000000
HostMin: 117.120.40.1 01110101.01111000.00101 000.00000001
HostMax: 117.120.47.254 01110101.01111000.00101 111.11111110
Broadcast: 117.120.47.255 01110101.01111000.00101 111.11111111
Hosts/Net: 2046 Class A