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



Address:   192.168.10.0          11000000.10101000.00001010 .00000000
Netmask: 255.255.255.0 = 24 11111111.11111111.11111111 .00000000
Wildcard: 0.0.0.255 00000000.00000000.00000000 .11111111
=> Network: 192.168.10.0/24 11000000.10101000.00001010 .00000000 (Class C)
Broadcast: 192.168.10.255 11000000.10101000.00001010 .11111111
HostMin: 192.168.10.1 11000000.10101000.00001010 .00000001
HostMax: 192.168.10.254 11000000.10101000.00001010 .11111110
Hosts/Net: 254 (Private Internet)

Subnets Netmask: 255.255.255.224 = 27 11111111.11111111.11111111.111 00000
Wildcard: 0.0.0.31 00000000.00000000.00000000.000 11111
Network: 192.168.10.0/27 11000000.10101000.00001010.000 00000 (Class C)
Broadcast: 192.168.10.31 11000000.10101000.00001010.000 11111
HostMin: 192.168.10.1 11000000.10101000.00001010.000 00001
HostMax: 192.168.10.30 11000000.10101000.00001010.000 11110
Hosts/Net: 30 (Private Internet)

Network: 192.168.10.32/27 11000000.10101000.00001010.001 00000 (Class C)
Broadcast: 192.168.10.63 11000000.10101000.00001010.001 11111
HostMin: 192.168.10.33 11000000.10101000.00001010.001 00001
HostMax: 192.168.10.62 11000000.10101000.00001010.001 11110
Hosts/Net: 30 (Private Internet)

Network: 192.168.10.64/27 11000000.10101000.00001010.010 00000 (Class C)
Broadcast: 192.168.10.95 11000000.10101000.00001010.010 11111
HostMin: 192.168.10.65 11000000.10101000.00001010.010 00001
HostMax: 192.168.10.94 11000000.10101000.00001010.010 11110
Hosts/Net: 30 (Private Internet)

Network: 192.168.10.96/27 11000000.10101000.00001010.011 00000 (Class C)
Broadcast: 192.168.10.127 11000000.10101000.00001010.011 11111
HostMin: 192.168.10.97 11000000.10101000.00001010.011 00001
HostMax: 192.168.10.126 11000000.10101000.00001010.011 11110
Hosts/Net: 30 (Private Internet)

Network: 192.168.10.128/27 11000000.10101000.00001010.100 00000 (Class C)
Broadcast: 192.168.10.159 11000000.10101000.00001010.100 11111
HostMin: 192.168.10.129 11000000.10101000.00001010.100 00001
HostMax: 192.168.10.158 11000000.10101000.00001010.100 11110
Hosts/Net: 30 (Private Internet)

Network: 192.168.10.160/27 11000000.10101000.00001010.101 00000 (Class C)
Broadcast: 192.168.10.191 11000000.10101000.00001010.101 11111
HostMin: 192.168.10.161 11000000.10101000.00001010.101 00001
HostMax: 192.168.10.190 11000000.10101000.00001010.101 11110
Hosts/Net: 30 (Private Internet)

Network: 192.168.10.192/27 11000000.10101000.00001010.110 00000 (Class C)
Broadcast: 192.168.10.223 11000000.10101000.00001010.110 11111
HostMin: 192.168.10.193 11000000.10101000.00001010.110 00001
HostMax: 192.168.10.222 11000000.10101000.00001010.110 11110
Hosts/Net: 30 (Private Internet)

Network: 192.168.10.224/27 11000000.10101000.00001010.111 00000 (Class C)
Broadcast: 192.168.10.255 11000000.10101000.00001010.111 11111
HostMin: 192.168.10.225 11000000.10101000.00001010.111 00001
HostMax: 192.168.10.254 11000000.10101000.00001010.111 11110
Hosts/Net: 30 (Private Internet)

Subnets: 8
Hosts: 240

Thanks to http://www.netzwerkinfo.de/daemons/ for this ip calculator icon :-)
Version 0.35.2 2005/07/07

Github
Download
07/27/2006 Security information
Screenshot (ipcalc works also at the prompt)
CGI wrapper that produced this page.
Archive
Have a look in the archives for the new version 0.41, with the capability to deaggregate network ranges
How to run this under windows
Debian users can apt-get install ipcalc
2000-2021 Krischan Jodies ipcalc202105 (a) jodies.de

Dear search engines: Please increase the ranking of our local Hackerspace / CCC Göttingen