georg@ed:~$ ipcalc 164.23.55.0 255.255.0.0 --s 254 62 20 20 20 14 6 2 2 2 2 Address: 164.23.55.0 10100100.00010111. 00110111.00000000 Netmask: 255.255.0.0 = 16 11111111.11111111. 00000000.00000000 Wildcard: 0.0.255.255 00000000.00000000. 11111111.11111111 => Network: 164.23.0.0/16 10100100.00010111. 00000000.00000000 HostMin: 164.23.0.1 10100100.00010111. 00000000.00000001 HostMax: 164.23.255.254 10100100.00010111. 11111111.11111110 Broadcast: 164.23.255.255 10100100.00010111. 11111111.11111111 Hosts/Net: 65534 Class B 1. Requested size: 254 hosts Netmask: 255.255.255.0 = 24 11111111.11111111.11111111. 00000000 Network: 164.23.0.0/24 10100100.00010111.00000000. 00000000 HostMin: 164.23.0.1 10100100.00010111.00000000. 00000001 HostMax: 164.23.0.254 10100100.00010111.00000000. 11111110 Broadcast: 164.23.0.255 10100100.00010111.00000000. 11111111 Hosts/Net: 254 Class B 2. Requested size: 62 hosts Netmask: 255.255.255.192 = 26 11111111.11111111.11111111.11 000000 Network: 164.23.1.0/26 10100100.00010111.00000001.00 000000 HostMin: 164.23.1.1 10100100.00010111.00000001.00 000001 HostMax: 164.23.1.62 10100100.00010111.00000001.00 111110 Broadcast: 164.23.1.63 10100100.00010111.00000001.00 111111 Hosts/Net: 62 Class B 3. Requested size: 20 hosts Netmask: 255.255.255.224 = 27 11111111.11111111.11111111.111 00000 Network: 164.23.1.64/27 10100100.00010111.00000001.010 00000 HostMin: 164.23.1.65 10100100.00010111.00000001.010 00001 HostMax: 164.23.1.94 10100100.00010111.00000001.010 11110 Broadcast: 164.23.1.95 10100100.00010111.00000001.010 11111 Hosts/Net: 30 Class B 4. Requested size: 20 hosts Netmask: 255.255.255.224 = 27 11111111.11111111.11111111.111 00000 Network: 164.23.1.96/27 10100100.00010111.00000001.011 00000 HostMin: 164.23.1.97 10100100.00010111.00000001.011 00001 HostMax: 164.23.1.126 10100100.00010111.00000001.011 11110 Broadcast: 164.23.1.127 10100100.00010111.00000001.011 11111 Hosts/Net: 30 Class B 5. Requested size: 20 hosts Netmask: 255.255.255.224 = 27 11111111.11111111.11111111.111 00000 Network: 164.23.1.128/27 10100100.00010111.00000001.100 00000 HostMin: 164.23.1.129 10100100.00010111.00000001.100 00001 HostMax: 164.23.1.158 10100100.00010111.00000001.100 11110 Broadcast: 164.23.1.159 10100100.00010111.00000001.100 11111 Hosts/Net: 30 Class B 6. Requested size: 14 hosts Netmask: 255.255.255.240 = 28 11111111.11111111.11111111.1111 0000 Network: 164.23.1.160/28 10100100.00010111.00000001.1010 0000 HostMin: 164.23.1.161 10100100.00010111.00000001.1010 0001 HostMax: 164.23.1.174 10100100.00010111.00000001.1010 1110 Broadcast: 164.23.1.175 10100100.00010111.00000001.1010 1111 Hosts/Net: 14 Class B 7. Requested size: 6 hosts Netmask: 255.255.255.248 = 29 11111111.11111111.11111111.11111 000 Network: 164.23.1.176/29 10100100.00010111.00000001.10110 000 HostMin: 164.23.1.177 10100100.00010111.00000001.10110 001 HostMax: 164.23.1.182 10100100.00010111.00000001.10110 110 Broadcast: 164.23.1.183 10100100.00010111.00000001.10110 111 Hosts/Net: 6 Class B 8. Requested size: 2 hosts Netmask: 255.255.255.252 = 30 11111111.11111111.11111111.111111 00 Network: 164.23.1.184/30 10100100.00010111.00000001.101110 00 HostMin: 164.23.1.185 10100100.00010111.00000001.101110 01 HostMax: 164.23.1.186 10100100.00010111.00000001.101110 10 Broadcast: 164.23.1.187 10100100.00010111.00000001.101110 11 Hosts/Net: 2 Class B 9. Requested size: 2 hosts Netmask: 255.255.255.252 = 30 11111111.11111111.11111111.111111 00 Network: 164.23.1.188/30 10100100.00010111.00000001.101111 00 HostMin: 164.23.1.189 10100100.00010111.00000001.101111 01 HostMax: 164.23.1.190 10100100.00010111.00000001.101111 10 Broadcast: 164.23.1.191 10100100.00010111.00000001.101111 11 Hosts/Net: 2 Class B 10. Requested size: 2 hosts Netmask: 255.255.255.252 = 30 11111111.11111111.11111111.111111 00 Network: 164.23.1.192/30 10100100.00010111.00000001.110000 00 HostMin: 164.23.1.193 10100100.00010111.00000001.110000 01 HostMax: 164.23.1.194 10100100.00010111.00000001.110000 10 Broadcast: 164.23.1.195 10100100.00010111.00000001.110000 11 Hosts/Net: 2 Class B 11. Requested size: 2 hosts Netmask: 255.255.255.252 = 30 11111111.11111111.11111111.111111 00 Network: 164.23.1.196/30 10100100.00010111.00000001.110001 00 HostMin: 164.23.1.197 10100100.00010111.00000001.110001 01 HostMax: 164.23.1.198 10100100.00010111.00000001.110001 10 Broadcast: 164.23.1.199 10100100.00010111.00000001.110001 11 Hosts/Net: 2 Class B Needed size: 456 addresses. Used network: 164.23.0.0/23 Unused: 164.23.1.200/29 164.23.1.208/28 164.23.1.224/27 164.23.2.0/23 164.23.4.0/22 164.23.8.0/21 164.23.16.0/20 164.23.32.0/19 164.23.64.0/18 164.23.128.0/17