diff --git a/lib/ildus/server/domain_backends/ldap.rb b/lib/ildus/server/domain_backends/ldap.rb
index 75e76cf..5f61e48 100644
--- a/lib/ildus/server/domain_backends/ldap.rb
+++ b/lib/ildus/server/domain_backends/ldap.rb
@@ -67,8 +67,10 @@ module Ildus::Server::DomainBackend
       raise Handler::HostNotFoundError if entry.nil?
 
       if addr.ipv4?
+        return false if entry['aRecord'][0] == addr.to_s
         @ldap.modify(entry['dn'][0], {"aRecord"    => [addr.to_s]})
       elsif addr.ipv6?
+        return false if entry['aAAARecord'][0] == addr.to_s
         @ldap.modify(entry['dn'][0], {"aAAARecord" => [addr.to_s]})
       else
         return false