http://jodies.de/ipcalc - võrkude arvutamiseks

saab ka alla laadida -

http://jodies.de/ipcalc-archive/

ja ka

http://enos.itcollege.ee/~edmund/materials/tools/net/ipcalc/

Usage: ipcalc [options] <ADDRESS>[[/]<NETMASK>] [NETMASK]

ipcalc takes an IP address and netmask and calculates the resulting broadcast, 
network, Cisco wildcard mask, and host range. By giving a second netmask, you 
can design sub- and supernetworks. It is also intended to be a teaching tool 
and presents the results as easy-to-understand binary values. 

 -n --nocolor  Don't display ANSI color codes.
 -b --nobinary Suppress the bitwise output.
 -c --class    Just print bit-count-mask of given address.
 -h --html     Display results as HTML (not finished in this version).
 -v --version  Print Version.
 -s --split n1 n2 n3
               Split into networks of size n1, n2, n3.
 -r --range    Deaggregate address range.
    --help     Longer help text.

Arvutusnäited:

ipcalc 192.168.0.1/24
ipcalc 192.168.0.1/255.255.128.0
ipcalc 192.168.0.1 255.255.128.0 255.255.192.0
ipcalc 192.168.0.1 0.0.63.255

ipcalc <ADDRESS1> - <ADDRESS2>  deaggregate address range

ipcalc <ADDRESS>/<NETMASK> --s a b c
# split network to subnets where a b c fits in.