diff --git a/machines/admin.py b/machines/admin.py
index b2550c68..aa7d6bc5 100644
--- a/machines/admin.py
+++ b/machines/admin.py
@@ -14,7 +14,7 @@ class MachineTypeAdmin(VersionAdmin):
 
 
 class ExtensionAdmin(VersionAdmin):
-    list_display = ('name',)
+    list_display = ('name','origin')
 
 class MxAdmin(VersionAdmin):
     list_display = ('zone', 'priority', 'name')
diff --git a/machines/forms.py b/machines/forms.py
index d54427e1..0b2ceb87 100644
--- a/machines/forms.py
+++ b/machines/forms.py
@@ -112,17 +112,18 @@ class DelIpTypeForm(ModelForm):
 class ExtensionForm(ModelForm):
     class Meta:
         model = Extension
-        fields = ['name']
+        fields = ['name', 'origin']
 
     def __init__(self, *args, **kwargs):
         super(ExtensionForm, self).__init__(*args, **kwargs)
         self.fields['name'].label = 'Extension à ajouter'
+        self.fields['origin'].label = 'Enregistrement A origin'
 
 class DelExtensionForm(ModelForm):
     extensions = forms.ModelMultipleChoiceField(queryset=Extension.objects.all(), label="Extensions actuelles",  widget=forms.CheckboxSelectMultiple)
 
     class Meta:
-        exclude = ['name']
+        exclude = ['name', 'origin']
         model = Extension
 
 class MxForm(ModelForm):
diff --git a/machines/migrations/0032_auto_20161119_1850.py b/machines/migrations/0032_auto_20161119_1850.py
new file mode 100644
index 00000000..f5b643c6
--- /dev/null
+++ b/machines/migrations/0032_auto_20161119_1850.py
@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('machines', '0031_auto_20161119_1709'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='extension',
+            name='origin',
+            field=models.OneToOneField(null=True, to='machines.IpList', blank=True, on_delete=django.db.models.deletion.PROTECT),
+        ),
+        migrations.AlterField(
+            model_name='extension',
+            name='name',
+            field=models.CharField(max_length=255, unique=True),
+        ),
+    ]
diff --git a/machines/models.py b/machines/models.py
index 0ff636c2..2602c86d 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -43,7 +43,8 @@ class IpType(models.Model):
 class Extension(models.Model):
     PRETTY_NAME = "Extensions dns"
 
-    name = models.CharField(max_length=255)
+    name = models.CharField(max_length=255, unique=True)
+    origin = models.OneToOneField('IpList', on_delete=models.PROTECT, blank=True, null=True)
 
     def __str__(self):
         return self.name
diff --git a/machines/templates/machines/aff_extension.html b/machines/templates/machines/aff_extension.html
index 1ae5ef8c..5753bf8d 100644
--- a/machines/templates/machines/aff_extension.html
+++ b/machines/templates/machines/aff_extension.html
@@ -2,13 +2,15 @@
         <thead>
             <tr>
                 <th>Extension</th>
-                <th></th>
+                <th>Enregistrement A origin</th>
+    		<th></th>
             </tr>
         </thead>
         {% for extension in extension_list %}
         <tr>
             <td>{{ extension.name }}</td>
-            <td class="text-right">
+            <td>{{ extension.origin }}</td>
+	    <td class="text-right">
             {% if is_infra %}
                 {% include 'buttons/edit.html' with href='machines:edit-extension' id=extension.id %}
             {% endif %}