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	diff --git a/app/models/domain.rb b/app/models/domain.rb
	index cec8552..1f69578 100644
	--- a/app/models/domain.rb
	+++ b/app/models/domain.rb
	@@ -1,75 +1,76 @@
	class Domain < ActiveRecord::Base
	self.inheritance_column = :nx

	def self.domain_types
	[
	'NATIVE',
	'MASTER',
	'SLAVE',
	]
	end

	belongs_to :group
	has_many :records
	has_one :soa, class_name: SOA

	validates :group_id, presence: true
	validates :name, uniqueness: true, presence: true
	validates :type, presence: true, inclusion: { in: domain_types }

	after_create :generate_soa

	attr_writer :serial_strategy
	def serial_strategy
	@serial_strategy \|\|= WebDNS.settings[:serial_strategy]
	end

	def reverse?
	name.end_with?('.in-addr.arpa') \|\| name.end_with?('.ip6.arpa')
	end

	# Compute subnet for reverse records
	def subnet
	return if not reverse?

	if name.end_with?('.in-addr.arpa')
	subnet_v4
	elsif name.end_with?('.ip6.arpa')
	subnet_v6
	end
	end

	private

	def subnet_v4
	# get ip octets (remove .in-addr.arpa)
	octets = name.split('.')[0...-2].reverse
	return if octets.any? { \|_\| false }

	mask = 8 * octets.size
	octets += [0, 0, 0, 0]

	ip = IPAddr.new octets[0, 4].join('.')

	[ip, mask].join('/')
	end

	def subnet_v6
	nibbles = name.split('.')[0...-2].reverse
	return if nibbles.any? { \|_\| false }

	mask = 4 * nibbles.size
	nibbles += [0] * 32

	ip = IPAddr.new nibbles[0, 32].in_groups_of(4).map(&:join).join(':')

	[ip, mask].join('/')
	end

	# Hooks
	def generate_soa
	soa_record = SOA.new(domain: self)
	- soa_record.save
	+
	+ soa_record.save!
	end

	end