diff --git a/uncloud/uncloud_net/models.py b/uncloud/uncloud_net/models.py
index 71a8362..6d0c742 100644
--- a/uncloud/uncloud_net/models.py
+++ b/uncloud/uncloud_net/models.py
@@ -1,3 +1,4 @@
 from django.db import models
 
-# Create your models here.
+class MACAdress(models.Model):
+    prefix = 0x420000000000