Method: IPAddress::IPv4#split

Defined in:

lib/ipaddress/ipv4.rb

#split(subnets = 2) ⇒ Object Also known as: /

Splits a network into different subnets

If the IP Address is a network, it can be divided into multiple networks. If self is not a network, this method will calculate the network from the IP and then subnet it.

If subnets is an power of two number, the resulting networks will be divided evenly from the supernet.

network = IPAddress("172.16.10.0/24")

network / 4   # implies map{|i| i.to_string}
  #=> ["172.16.10.0/26",
       "172.16.10.64/26",
       "172.16.10.128/26",
       "172.16.10.192/26"]

If num is any other number, the supernet will be divided into some networks with a even number of hosts and other networks with the remaining addresses.

network = IPAddress("172.16.10.0/24")

network / 3   # implies map{|i| i.to_string}
  #=> ["172.16.10.0/26",
       "172.16.10.64/26",
       "172.16.10.128/25"]

Returns an array of IPv4 objects

# File 'lib/ipaddress/ipv4.rb', line 618

def split(subnets=2)
  unless (1..(2**@prefix.host_prefix)).include? subnets
    raise ArgumentError, "Value #{subnets} out of range" 
  end
  networks = subnet(newprefix(subnets))
  until networks.size == subnets
    networks = sum_first_found(networks)
  end
  return networks
end