ipv4_validator.rb
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	require 'ipaddr'
	require 'socket'

	class Ipv4Validator < ActiveModel::EachValidator
	# Returns true if addr is a valid IPv4 address.
	def valid_v4?(addr)
	return false if addr['/'] # IPAddr accepts addr/mask format
	IPAddr.new(addr, Socket::AF_INET)
	true
	rescue IPAddr::AddressFamilyError, IPAddr::InvalidAddressError
	false
	end

	# Add an attribute error if this is not a valid IPv4 address.
	def validate_each(record, attribute, value)
	return if valid_v4?(value)
	record.errors[attribute] << 'is not a valid IPv4 address'
	end
	end