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

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