subnetcalc - Man Page

IPv4/IPv6 Subnet Calculator

Synopsis

subnetcalc address/prefix

subnetcalc

[-h | --help]

subnetcalc

[-v | --version]

subnetcalc is an IPv4/IPv6 subnet address calculator. For a 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 may be provided:

address: The IP address. If a hostname is provided here, the program attempts to resolve the hostname via a DNS server, and the first returned address is used. Internationalized Domain Names (IDN) are supported.
netmask: The netmask.
prefix: The prefix length (0-32 for IPv4; 0-128 for IPv6).
-u | --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 and FreeBSD, /dev/urandom is used for random number generation.
-U | --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.
-n | --noreverselookup: Turns reverse DNS lookup off.
-g | --nogeoiplookup: Turns GeoIP lookup off.
-c | --nocolour | --nocolor: Turns colourised output off.
-h | --help: Prints command-line parameters.
-v | --version: Prints program version.