diff --git a/app/controllers/api/v1/sites_controller.rb b/app/controllers/api/v1/sites_controller.rb
index bebd03a8..b1711d63 100644
--- a/app/controllers/api/v1/sites_controller.rb
+++ b/app/controllers/api/v1/sites_controller.rb
@@ -5,6 +5,7 @@ module Api
     # API para sitios
     class SitesController < BaseController
       SUBDOMAIN = ".#{Site.domain}"
+      TESTING_SUBDOMAIN = ".testing.#{Site.domain}"
       PARTS = Site.domain.split('.').count
 
       if Rails.env.production?
@@ -18,6 +19,8 @@ module Api
           canonicalize name
         end.reject do |name|
           subdomain? name
+        end.reject do |name|
+          testing? name
         end.uniq
 
         render json: all_names
@@ -43,6 +46,14 @@ module Api
         name.end_with?(SUBDOMAIN) && name.split('.').count == (PARTS + 1)
       end
 
+      # Es un dominio de prueba
+      #
+      # @param name [String]
+      # @return [Bool]
+      def testing?(name)
+        name.end_with?(TESTING_SUBDOMAIN) && name.split('.').count == (PARTS + 2)
+      end
+
       # Nombres de los sitios
       #
       # @param name [String]