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subnetcalc(1) General Commands Manual subnetcalc(1) NAME subnetcalc -- IPv4/IPv6 Subnet Calculator SYNOPSIS subnetcalc [AddresAddresPrefiAddresNetmasAddress/Prefi|Address/Netmask] [-n] [-uniquelocal] [-uniquelocalhq] [-nocolour | -nocolor] [-v | -version] DESCRIPTION subnetcalc is an IPv4/IPv6 subnet address calculator. For given IPv4 or IPv6 address and netmask or prefix length, it calculates network ad- dress, broadcast address, maximum number of hosts and host address range. Also, it prints the addresses in binary format for better under- standability. Furthermore, it prints useful information on specific ad- dress 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 ad- dress 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 re- placed by a randomly chosen IPv6 Unique Local prefix in fc00::/7 (see also RFC 4193). Under Linux and FreeBSD, /dev/urandom is used for random number generation. -uniquelocalhq Like -uniquelocal, but using /dev/random instead on Linux and FreeBSD 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. -nocolour | -nocolor Turns colourised output off. -v | -version Just prints program version. EXAMPLES subnetcalc -v subnetcalc 132.252.250.0 255.255.255.0 subnetcalc 132.252.250.0/255.255.255.0 -nocolor subnetcalc 132.252.250.0 24 subnetcalc 132.252.250.0/24 -nocolour 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 dsseldorf.de 28 subnetcalc www.kln.de subnetcalc rksmrgs.josefsson.org 24 AUTHORS Thomas Dreibholz https://www.nntb.no/~dreibh/subnetcalc mailto://thomas.dreibholz@gmail.com subnetcalc December 13, 2024 subnetcalc(1)
NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | EXAMPLES | AUTHORS
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