diff --git a/app/models/record.rb b/app/models/record.rb
index b68bc29..bf0aecd 100644
--- a/app/models/record.rb
+++ b/app/models/record.rb
@@ -1,346 +1,348 @@
 require 'ipaddr'
 require_dependency 'drop_privileges_validator'
 
 class Record < ActiveRecord::Base
   belongs_to :domain
   # Powerdns inserts empty records on slave zones,
   # we want to hide them
   #
   # http://mailman.powerdns.com/pipermail/pdns-users/2013-December/010389.html
   default_scope { where.not(type: nil) }
 
   # List all supported DNS RR types.
   def self.record_types
     [
       'A', 'AAAA', 'CNAME',
       'MX',
       'TXT', 'SPF', 'SRV', 'SSHFP',
       'SOA', 'NS',
       'PTR', 'NAPTR',
       'DS'
     ]
   end
 
   # List types usually used in forward zones.
   def self.forward_records
     record_types - ['SOA', 'PTR']
   end
 
   # List types usually used in reverse zones.
   def self.reverse_records
     ['PTR', 'CNAME', 'TXT', 'NS', 'NAPTR', 'DS']
   end
 
   # List types usually used in enum zones.
   def self.enum_records
     ['NAPTR', 'CNAME', 'TXT', 'NS', 'DS']
   end
 
   # List types that can be touched by a simple user.
   def self.allowed_record_types
     record_types - WebDNS.settings[:prohibit_records_types]
   end
 
   validates :name, presence: true
   validates :type, inclusion: { in: record_types }
 
   # http://mark.lindsey.name/2009/03/never-use-dns-ttl-of-zero-0.html
   validates_numericality_of :ttl,
                             allow_nil: true, # Default pdns TTL
                             only_integer: true,
                             greater_than: 0,
                             less_than_or_equal_to: 2_147_483_647
 
   # Don't allow the following actions on drop privileges mode
   validate :no_touching_for_slave_zones, if: -> { domain.slave? }
 
   validates_drop_privileges :type,
                             message: 'You cannot touch that record!',
                             unless: -> { Record.allowed_record_types.include?(type) }
   validates_drop_privileges :name,
                             message: 'You cannot touch top level NS records!',
                             if: -> { type == 'NS' && domain_record? }
 
   validates_uniqueness_of :name,
                           :scope => [:domain, :type, :content],
                           message: "There already exists a record with the same name,
                             type and content."
 
   before_validation :guess_reverse_name
   before_validation :set_name
   after_save :update_zone_serial
   after_destroy :update_zone_serial
 
   before_create :validate_unique_cname
   before_create :generate_classless_delegations, unless: -> { domain.slave? }
   before_destroy :delete_classless_delegations, unless: -> { domain.slave? }
 
   # Smart sort a list of records.
   #
   # Order by:
   # * Top level records
   # * Record name
   # * SOA
   # * NS
   # * Friendly type
   # * Priority
   # * Content
   #
   # records - The list of records to order.
   #
   # Returns the list sorted.
   def self.smart_order(records)
     records.sort_by { |r|
       [
         r.domain_record? ? 0 : 1,   # Zone records
         r.classless_delegated? ? 1 : 0,
         r.name,
         r.type == 'SOA' ? 0 : 1,
         r.type == 'NS' ? 0 : 1,
         record_types.index(r.type), # Friendly type
         r.prio || 0,
         r.content
       ]
     }
   end
 
   def self.search(query)
     wild_search = "%#{query}%" # !index_friendly
 
     where('name like :q or content like :q', q: wild_search)
   end
 
   # Get the a short name for the record (without the zone suffix).
   #
   # Returns a string.
   def short
     return '' if name == domain.name
     return '' if name.blank?
 
     File.basename(name, ".#{domain.name}")
   end
 
   # Returns true if this is a zone record.
   def domain_record?
     name.blank? || name == domain.name
   end
 
   # Find out if the record is edittable.
   #
   # by - Editable by :user or :admin.
   #
   # Returns true if the record is editable.
   def editable?(by = :user)
     return false if domain.slave?
     return false if classless_delegated?
 
     case by
     when :user
       return false unless Record.allowed_record_types.include?(type)
       return false if type == 'NS' && domain_record?
     end
 
     true
   end
 
   # Find out this record type supports priorities.
   #
   # We set this to false by default, record types that support priorities.
   # shoule override this.
   #
   # Returns true this record type support priorities.
   def supports_prio?
     false
   end
 
   # Make sure rails generates record specific urls for all record types.
   #
   # Overrides default rails STI behavior.
   def self.model_name
     return super if self == Record
 
     Record.model_name
   end
 
   # Generate the usual admin friendly DNS record line.
   #
   # Returns a string.
   def to_dns
     [name, ttl, 'IN', type, supports_prio? ? prio : nil, content].compact.join(' ')
   end
 
   # Generate a shorter version of the DNS record line.
   #
   # Returns a string.
   def to_short_dns
     [name, 'IN', type].join(' ')
   end
 
   def to_api
     Hash[
       :name, name,
       :content, content,
       :type, type,
       :ttl, ttl,
       :prio, prio,
       :disabled, disabled
     ].with_indifferent_access
   end
 
   def classless_delegated?
     return false if not type == 'CNAME'
     return false if not domain.name.end_with?('.in-addr.arpa')
 
     network, mask = parse_delegation(content)
     return false if network.nil?
 
     octet = name.split('.').first.to_i
     return true if octet >= network
     return true if octet <= network + 2 ^ (32 - mask) - 1 # max
 
     false
   end
 
   def classless_delegation?
     return true if classless_delegation
 
     false
   end
 
   def as_bulky_json
     Hash[
       id: id,
       name: name,
       type: type,
       ttl: ttl,
       prio: prio,
       content: content,
       disabled: disabled
     ]
   end
   private
 
   # Validations
 
   def no_touching_for_slave_zones
     # Allow automatic SOA creation for slave zones
     # powerdns needs a valid serial to compare it with master
     return if type == 'SOA' && validation_context == :create
 
     errors.add(:type, 'This is a slave zone!')
   end
 
   # Hooks
 
   def guess_reverse_name
     return if not type == 'PTR'
     return if not domain.reverse?
     return if name.blank?
 
     reverse = IPAddr.new(name).reverse
     self.name = reverse if reverse.end_with?(domain.name)
   rescue IPAddr::InvalidAddressError # rubycop:disable HandleExceptions
   end
 
   # Powerdns expects full domain names
   def set_name
     self.name = domain.name if name.blank?
     self.name = "#{name}.#{domain.name}" if not name.end_with?(domain.name)
   end
 
   def remove_terminating_dot
     self.content = content.gsub(/\.+\Z/, '')
   end
 
   def update_zone_serial
     # SOA records handle serial themselves
     return true if type == 'SOA'
     return true if !domain
 
     domain.soa.bump_serial!
   end
 
   def classless_delegation
     return if not type == 'NS'
     return if not domain.name.end_with?('.in-addr.arpa')
 
     network, mask = parse_delegation(name)
     return if network.nil?
 
     range = IPAddr.new("0.0.0.#{network}/#{mask}").to_range
     return if !range.first.to_s.end_with?(".#{network}")
 
     range.map { |ip|
       octet = ip.to_s.split('.').last
       "#{octet}.#{domain.name}"
     }
   end
 
   def parse_delegation(value)
     first, _rest = value.split('.', 2)
     first.gsub!('-', '/')
     return if !first['/']
 
     network, mask = first.split('/', 2).map { |i| Integer(i).abs }
     return if [network, mask].join('/') != first
     return if mask <= 24
     return if mask > 31
     return if network > 255
 
     [network, mask]
   rescue ArgumentError # Not an integer
   end
 
   def delete_classless_delegations
     rnames = classless_delegation
     return unless rnames
 
     # Check if we have another NS for the same delegation
     return if domain.records.where(type: 'NS', name: name)
                .where.not(id: id).exists?
 
     # Delete all CNAMEs
     domain.records.where(name: rnames,
                          type: 'CNAME',
                          content: name).delete_all
   end
 
   def generate_classless_delegations
     rnames = classless_delegation
     return unless rnames
 
-    # This is the FQDN of the delegation e.g. "1.0-26.24.251.195.in-addr.arpa"
-    octet = rname.to_s.split('.').first
-    delegate_content = "#{octet}.#{name}"
 
-    # Make sure no record exists for a delegated domain
+    # Make sure no record pre-exist for a delegated domain
     if domain.records.where(name: rnames)
-        .where.not(content: delegate_content).exists?
+        .where.not("content LIKE ?", "%#{name}").exists?
+
 
       errors.add(:name, 'Records already exist for the delegated octets!')
       return false
     end
 
     rnames.each { |rname|
+      # This is the FQDN of the delegation e.g. "1.0-26.24.251.195.in-addr.arpa"
+      octet = rname.to_s.split('.').first
+      delegate_content = "#{octet}.#{name}"
+
       CNAME.find_or_create_by!(
         type: 'CNAME',
         domain: domain,
         name: rname,
         content: delegate_content,
       )
     }
   end
 
   def self.to_fqdn(name, domain)
     return name if name.end_with?(domain)
 
     "#{name}.#{domain}"
   end
 
   def validate_unique_cname
     return if !domain.records.where(type: 'CNAME', name: name).exists?
 
     errors.add(:name, 'There exists a CNAME record with the same name')
     return false
   end
 end