diff --git a/.reek b/.reek
index f108f4bf3..6cdd58c75 100644
--- a/.reek
+++ b/.reek
@@ -1136,7 +1136,5 @@ UncommunicativeParameterName:
   - Dnskey#int_to_hex
 UncommunicativeMethodName:
   exclude:
-  - Nameserver#val_ipv4
-  - Nameserver#val_ipv6
   - Soap::Arireg#country_code_3
   - WhiteIp#validate_ipv4_and_ipv6
diff --git a/app/models/nameserver.rb b/app/models/nameserver.rb
index ca82d5fb6..d9a5f2a75 100644
--- a/app/models/nameserver.rb
+++ b/app/models/nameserver.rb
@@ -7,12 +7,25 @@ class Nameserver < ActiveRecord::Base
     *([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]
     *[A-Za-z0-9])\z/x
 
+  IPV4_REGEXP = /\A(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}
+    ([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\z/x
+
+  IPV6_REGEXP = /(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|
+    ([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|
+    ([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|
+    ([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|
+    ([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|
+    :((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|
+    ::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|
+    1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|
+    1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))/x
+
   belongs_to :domain, required: true
 
   validates :hostname, presence: true
   validates :hostname, format: { with: HOSTNAME_REGEXP }, allow_blank: true
-  validate :val_ipv4
-  validate :val_ipv6
+  validate :validate_ipv4_format
+  validate :validate_ipv6_format
   validate :require_ip, if: :glue_record_required?
 
   before_validation :normalize_attributes
@@ -90,17 +103,15 @@ class Nameserver < ActiveRecord::Base
     errors.add(:hostname, :invalid) if hostname =~ regexp
   end
 
-  def val_ipv4
-    regexp = /\A(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\z/
+  def validate_ipv4_format
     ipv4.to_a.each do |ip|
-      errors.add(:ipv4, :invalid) unless ip =~ regexp
+      errors.add(:ipv4, :invalid) unless ip =~ IPV4_REGEXP
     end
   end
 
-  def val_ipv6
-    regexp = /(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))/
+  def validate_ipv6_format
     ipv6.to_a.each do |ip|
-      errors.add(:ipv6, :invalid) unless ip =~ regexp
+      errors.add(:ipv6, :invalid) unless ip =~ IPV6_REGEXP
     end
   end
 end