diff --git a/conntrackt/models.py b/conntrackt/models.py
--- a/conntrackt/models.py
+++ b/conntrackt/models.py
@@ -20,7 +20,7 @@
 
 
 # Django imports.
-from django.contrib.admin.util import NestedObjects
+from django.contrib.admin.utils import NestedObjects
 from django.core.exceptions import ValidationError
 from django.core.urlresolvers import reverse
 from django.db import models
@@ -346,8 +346,8 @@ class Interface(RelatedCollectorMixin, m
     name = models.CharField(max_length=100, default='eth0')
     description = models.TextField(blank=True, default='Main network interface.')
     entity = models.ForeignKey(Entity)
-    address = models.IPAddressField()
-    netmask = models.IPAddressField(default='255.255.255.255')
+    address = models.GenericIPAddressField()
+    netmask = models.GenericIPAddressField(default='255.255.255.255')
 
     class Meta:
         # Enforce uniqueness of interface name in an entity. Enforce uniqueness