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



Address:   10.0.0.0              00001010.00000000 .00000000.00000000
Netmask: 255.255.0.0 = 16 11111111.11111111 .00000000.00000000
Wildcard: 0.0.255.255 00000000.00000000 .11111111.11111111
=> Network: 10.0.0.0/16 00001010.00000000 .00000000.00000000 (Class A)
Broadcast: 10.0.255.255 00001010.00000000 .11111111.11111111
HostMin: 10.0.0.1 00001010.00000000 .00000000.00000001
HostMax: 10.0.255.254 00001010.00000000 .11111111.11111110
Hosts/Net: 65534 (Private Internet)

Subnets Netmask: 255.255.192.0 = 18 11111111.11111111.11 000000.00000000
Wildcard: 0.0.63.255 00000000.00000000.00 111111.11111111
Network: 10.0.0.0/18 00001010.00000000.00 000000.00000000 (Class A)
Broadcast: 10.0.63.255 00001010.00000000.00 111111.11111111
HostMin: 10.0.0.1 00001010.00000000.00 000000.00000001
HostMax: 10.0.63.254 00001010.00000000.00 111111.11111110
Hosts/Net: 16382 (Private Internet)

Network: 10.0.64.0/18 00001010.00000000.01 000000.00000000 (Class A)
Broadcast: 10.0.127.255 00001010.00000000.01 111111.11111111
HostMin: 10.0.64.1 00001010.00000000.01 000000.00000001
HostMax: 10.0.127.254 00001010.00000000.01 111111.11111110
Hosts/Net: 16382 (Private Internet)

Network: 10.0.128.0/18 00001010.00000000.10 000000.00000000 (Class A)
Broadcast: 10.0.191.255 00001010.00000000.10 111111.11111111
HostMin: 10.0.128.1 00001010.00000000.10 000000.00000001
HostMax: 10.0.191.254 00001010.00000000.10 111111.11111110
Hosts/Net: 16382 (Private Internet)

Network: 10.0.192.0/18 00001010.00000000.11 000000.00000000 (Class A)
Broadcast: 10.0.255.255 00001010.00000000.11 111111.11111111
HostMin: 10.0.192.1 00001010.00000000.11 000000.00000001
HostMax: 10.0.255.254 00001010.00000000.11 111111.11111110
Hosts/Net: 16382 (Private Internet)

Subnets: 4
Hosts: 65528

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

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