cidr

CIDR(1)                      General Commands Manual                     CIDR(1)



NAME
       cidr - RFC 1878 subnet helper

SYNOPSIS
       cidr [-v]

       cidr <ipaddress/prefix> [-H]

       cidr <-b|-q|-h|-d> <ipaddress> <-b|-q|-h|-d|-p> <mask|prefix> [-H]

DESCRIPTION
       cidr is a utility for determining the network address and broadcast
       address for a CIDR subnet.  It takes as input an ip address and netmask
       in binary, dotted-quad, hexadecimal, decimal or prefix formats.  It
       outputs the network address, broadcast address, and a count (and
       optionally a list) of valid host addresses for the corresponding subnet.

OPTIONS
       -v     print version information

       -b <ipaddress|mask>
              IP address or mask as a binary number

       -q <ipaddress|mask>
              ip address or mask as a dotted-quad

       -h <ipaddress|mask>
              ip address or mask as a hexadecimal number

       -d <ipaddress|mask>
              ip address or mask as a decimal number

       -p <prefix>
              netmask as a CIDR prefix (decimal integer 1-32)

       -H     print a list of valid host addresses

       ipaddress
              ip address in the form specified by option -b, -q, -h, or -d

       mask   netmask in the form specified by option -b, -q, -h, or -d

       prefix netmask as a CIDR prefix (decimal integer 1-32)

EXAMPLES
       cidr 192.168.14.56/27

       cidr 192.168.14.56/27 -H

       Note:  The above forms only support dotted-quad ip address and prefix
       netmask.

       cidr -q 192.168.14.56 -h ffffff00

       cidr -q 192.168.14.56 -q 255.255.255.0 -H

       cidr -h 0xfe12abcf -b 11111111111111111111111100000000

       cidr -d 2929937821 -p 32

       cidr -b 11110000101010100101010111001100 -p 24 -H

BUGS
       Hangs on calculation of 255.255.255.255/32

COPYRIGHT
       cidr.c -- determine CIDR network and broadcast address from IPv4 ip
       address and netmask

       Copyright (C) 2000 Robert L. Lineberger

       This program is free software; you can redistribute it and/or modify it
       under the terms of the GNU General Public License as published by the
       Free Software Foundation; either version 2 of the License, or (at your
       option) any later version.

       This program is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
       Public License for more details.

       You should have received a copy of the GNU General Public License along
       with this program; if not, write to the Free Software Foundation, Inc.,
       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


AUTHOR
       Robert L. Lineberger <robert@geeksoul.com>

CONTRIBUTORS
       David A. Bandel

       Iain Lea

       Herman Robers

SEE ALSO
       RFC 1878




                                                                         CIDR(1)