diff --git a/conntrackt/tests/test_models.py b/conntrackt/tests/test_models.py
--- a/conntrackt/tests/test_models.py
+++ b/conntrackt/tests/test_models.py
@@ -68,3 +68,37 @@ class EntityTest(TestCase):
 
         comm = Communication(source=ent1_eth0, destination=ent2_eth0, protocol="BOGUS", port="1234")
         self.assertRaises(ValidationError, comm.full_clean)
+
+    def test_representation(self):
+        """
+        Test the representation of entity.
+        """
+
+        ent = Entity.objects.get(name="Test Entity 1")
+        representation = "Test Entity 1 (Test Project 1 - Test Location 1)"
+
+        self.assertEqual(str(ent), representation)
+
+
+class InterfaceTest(TestCase):
+    fixtures = ['test-data.json']
+
+    def test_representation_single(self):
+        """
+        Test representation of single IP address.
+        """
+
+        interface = Entity.objects.get(name="Test Entity 1").interface_set.get(name="eth0")
+        representation = "Test Entity 1 (192.168.1.1)"
+
+        self.assertEqual(str(interface), representation)
+
+    def test_representation_subnet(self):
+        """
+        Test representation of subnet.
+        """
+
+        interface = Entity.objects.get(name="Test Subnet").interface_set.get(name="eth0")
+        representation = "Test Subnet (192.168.2.0/255.255.255.0)"
+
+        self.assertEqual(str(interface), representation)