ipcalc and other IP addressing calculators

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http://linux-ip.net/html/tools-ipcalc.html

There are a number of different utilities called ipcalc, almost all of which perform the same basic task. These are handy calculators for converting from CIDR to traditional IP notation and determining network and broadcast addresses.

A short []perl script, this prints out all the information you http://packages.debian.org/unstable/net/ipcalc.html would want to know about an IP address. It defaults to print colorized output, and comes with its own CGI.
For those who perform all operations and research through a web browser, a []DHTML calculator should do the trick. http://www.hesketh.com/~schampeo/projects/ipcalc/
You can run this []ipcalc, which features hexadecimal as well http://www.ajw.com/ipcalc.htm as decimal output, on your PDA.
RedHat has created their own ipcalc utility which prints out a shell variable assignment command instead of simply the requested piece of information. In the startup scripts, RedHat evals this variable assignement into existence. Despite this shortcoming, it is a useful tool and is documented in its manpage (part of the initscripts RPM).

Doubtless, there are a large number of other IP calculators available to ease the job of the network administrator. The above tools are meant as a brief summary of some of the offerings.

ipcalc from Debian

NAME
      ipcalc - An IP Netmask/broadcast/etc calculator

SYNTAX
       ipcalc  [-n|-h|-v|-help] <ADDRESS>[[/]<NETMASK>] [NETMASK]

DESCRIPTION
      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     Don't display ANSI color codes

-b     Suppress the bitwise output

-c     Just print bit-count-mask of given address

EXAMPLES
      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

AUTHOR
           Written by Krischan Jodies <krischan@jodies.de>

SEE ALSO
      ipsc(1) gipsc(1)

The ipcalc website: http://jodies.de/ipcalc

$ ipcalc -n -b 192.168.0.1/24
Address:   192.168.0.1
Netmask:   255.255.255.0 = 24
Wildcard:  0.0.0.255
=>
Network:   192.168.0.0/24
HostMin:   192.168.0.1
HostMax:   192.168.0.254
Broadcast: 192.168.0.255
Hosts/Net: 254                   Class C, Private Internet

ipsc from Debian

usage: ipsc [options] <addr/mask | addr/offset | addr>
        -C <class>      Network class (a, b, or c).  Must be used with -B
        -B <bits>       Subnet bits (must be used with -C)
        -i <if>         Reverse engineer an interface (e.g. eth0)
        -a              Print all information available
        -g              Print general information
        -s              Print all possible subnets
        -h              Print host information
        -c              Print CIDR information

$ ipsc -i eth0
Network class:            C
Network mask:             255.255.255.0
Network mask (hex):       FFFFFF00
Network address:          192.168.15.0
Subnet bits:              0
Max subnets:              1
Full subnet mask:         255.255.255.0
Full subnet mask (hex):   FFFFFF00
Host bits:                8
Addresses per subnet:     256
Bit map:                  nnnnnnnn.nnnnnnnn.nnnnnnnn.hhhhhhhh

ipcalc from RedHat

http://linuxcommand.org/man_pages/ipcalc1.html

SYNOPSIS

ipcalc [OPTION]... <IP address>[/prefix] [netmask]

DESCRIPTION

ipcalc  provides  a  simple way to calculate IP information for a host.
The various options specify what information ipcalc should  display  on
standard  out.  Multiple  options  may  be specified.  An IP address to
operate on must always be specified.  Most operations  also  require  a
netmask or a CIDR prefix as well.

OPTIONS

-b, --broadcast
       Display  the  broadcast  address for the given IP address
       and netmask.

-h, --hostname
       Display the hostname for the given IP address.

-m, --netmask
       Calculate the  netmask  for  the  given  IP  address.  It
       assumes  that the IP address is in a complete class A, B,
       or C network. Many networks do not use the  default  net-
       masks,  in  which  case  an  inappropriate  value will be
       returned.

-p, --prefix
       Show the prefix for the given mask/IP address.

-n, --network
       Display the network address for the given IP address  and
       netmask.

-s, --silent
       Don't ever display error messages.

AUTHORS

Erik Troan <ewt@redhat.com>

documented on: 2005.02.16