subnetcalc man page on DragonFly

subnetcalc man page on DragonFly

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subnetcalc(1)		  BSD General Commands Manual		 subnetcalc(1)

NAME
     subnetcalc — IPv4/IPv6 Subnet Calculator

SYNOPSIS
     subnetcalc [Address] [Netmask/Prefix] [-n] [-uniquelocal]
		[-uniquelocalhq]

DESCRIPTION
     subnetcalc is an IPv4/IPv6 subnet address calculator. For given IPv4 or
     IPv6 address and netmask or prefix length, it calculates network address,
     broadcast address, maximum number of hosts and host address range. Also,
     it prints the addresses in binary format for better understandability.
     Furthermore, it prints useful information on specific address types (e.g.
     type, scope, interface ID, etc.).

ARGUMENTS
     The following arguments have to be provided:

     Address
	     The IP address. If a hostname is provided here, it is tried to
	     resolve the address by a DNS server and the first returned
	     address is used. Internationalized Domain Names (IDN) are sup‐
	     ported.

     Netmask/Prefix
	     The netmask or prefix length (0-32 for IPv4; 0-128 for IPv6).

     -n	     Skip trying a reverse DNS lookup.

     -uniquelocal
	     Given an IPv6 address, the first 48 bits of the address are
	     replaced by a randomly chosen IPv6 Unique Local prefix in
	     fc00::/7 (see also RFC 4193). Under Linux, /dev/urandom is used
	     for random number generation.

     -uniquelocalhq
	     Like -uniquelocal, but using /dev/random instead on Linux systems
	     for highest-quality random number generation. On other systems,
	     this option is equal to -uniquelocal. Note, that reading from
	     /dev/random may take some time. You can speed up this process by
	     delivering random input e.g. by pressing keys or moving the
	     mouse.

EXAMPLES
     subnetcalc 132.252.250.0 255.255.255.0

     subnetcalc 132.252.250.0/255.255.255.0

     subnetcalc 132.252.250.0 24

     subnetcalc 132.252.250.0/24

     subnetcalc fec0:2345:6789:1111:221:6aff:fe0b:2674 56

     subnetcalc 2a00:1450:8007::69 64

     subnetcalc ff08::1:2:3

     subnetcalc 131.220.6.5/24

     subnetcalc 132.252.181.87 -n

     subnetcalc www.iem.uni-due.de 24

     subnetcalc www.six.heise.de

     subnetcalc fd00:: 64 -uniquelocal

     subnetcalc fd00::9876:256:7bff:fe1b:3255 56 -uniquelocalhq

     subnetcalc düsseldorf.de 28

     subnetcalc www.köln.de

     subnetcalc räksmörgås.josefsson.org 24

AUTHORS
     Thomas Dreibholz
     http://www.iem.uni-due.de/~dreibh/subnetcalc
     mailto://dreibh@iem.uni-due.de

subnetcalc		       November 22, 2011		    subnetcalc

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