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



Address:   12.34.56.0            00001100.00100010.00111000.00000 000
Netmask: 255.255.255.248 = 29 11111111.11111111.11111111.11111 000
Wildcard: 0.0.0.7 00000000.00000000.00000000.00000 111
=> Network: 12.34.56.0/29 00001100.00100010.00111000.00000 000 (Class A)
Broadcast: 12.34.56.7 00001100.00100010.00111000.00000 111
HostMin: 12.34.56.1 00001100.00100010.00111000.00000 001
HostMax: 12.34.56.6 00001100.00100010.00111000.00000 110
Hosts/Net: 6


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

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
2000-2011 Krischan Jodies

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