diff --git a/config.yml b/config.yml
index 27158d0..d02cf1c 100644
--- a/config.yml
+++ b/config.yml
@@ -18,6 +18,11 @@ plugins:
 
 tld: 'cyb'
 
+reserved_domains:
+  # use lowercase please
+  - "opennic"
+  - "dns"
+
 zonewriter:
   # Values used for SOA
   ns: 'ns12.opennic.glue'
diff --git a/lib/cyberman/Domains.pm b/lib/cyberman/Domains.pm
index e607a57..0901112 100644
--- a/lib/cyberman/Domains.pm
+++ b/lib/cyberman/Domains.pm
@@ -50,6 +50,14 @@ post '/domains/new' => sub {
     }
   }
 
+  if (scalar(keys(%errs)) == 0) {
+    foreach my $disallowed (@{ config->{"reserved_domains"} }) {
+      if ($name eq $disallowed) {
+        $errs{"e_reserved"} = 1;
+      }
+    }
+  }
+
   if (scalar(keys(%errs)) != 0) {
     return template 'domains/new' => {
       %errs,
diff --git a/views/domains/new.tt b/views/domains/new.tt
index a993861..38b6048 100644
--- a/views/domains/new.tt
+++ b/views/domains/new.tt
@@ -16,6 +16,9 @@
     <% IF e_chars %>
     The domain '<% params.name | html_entity %>.<% vars.config.tld %>' contains invalid characters.
     <% END %>
+    <% IF e_reserved %>
+    The domain '<% params.name | html_entity %>.<% vars.config.tld %>' is reserved for use by the registry.
+    <% END %>
   </div>
   <br /><br />
 </center>