diff --git a/machines/models.py b/machines/models.py
index 0276785c..f8d243d4 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -1,8 +1,33 @@
 from django.db import models
-from django.forms import ModelForm, Form
+from django.forms import ModelForm, Form, ValidationError
 from macaddress.fields import MACAddressField
 
 from users.models import User
+from django.conf import settings
+import re
+
+def full_domain_validator(hostname):
+    """ Validation du nom de domaine, extensions dans settings, prefixe pas plus long que 63 caractères """
+    HOSTNAME_LABEL_PATTERN = re.compile("(?!-)[A-Z\d-]+(?<!-)$", re.IGNORECASE)
+    if not any(ext in hostname for ext in settings.ALLOWED_EXTENSIONS):
+        raise ValidationError(
+                ", le nom de domaine '%(label)s' doit comporter une extension valide",
+                params={'label': hostname},
+        )
+    for extension in settings.ALLOWED_EXTENSIONS:
+        if hostname.endswith(extension):
+            hostname=re.sub('%s$' % extension, '', hostname) 
+            break
+    if len(hostname) > 63:
+        raise ValidationError(
+                ", le nom de domaine '%(label)s' est trop long (maximum de 63 caractères).",
+                params={'label': hostname},
+        )
+    if not HOSTNAME_LABEL_PATTERN.match(hostname):
+        raise ValidationError(
+                ", ce nom de domaine '%(label)s' contient des carractères interdits.",
+                params={'label': hostname},
+        )
 
 class Machine(models.Model):
     user = models.ForeignKey('users.User', on_delete=models.PROTECT)
@@ -26,7 +51,7 @@ class Interface(models.Model):
     mac_address = MACAddressField(integer=False, unique=True)
     machine = models.ForeignKey('Machine', on_delete=models.PROTECT)
     details = models.CharField(max_length=255, blank=True)
-    dns = models.CharField(help_text="Obligatoire et unique, doit se terminer en .rez et ne pas comporter de points", max_length=255, unique=True)
+    dns = models.CharField(help_text="Obligatoire et unique, doit se terminer en %s et ne pas comporter d'autres points" % ", ".join(settings.ALLOWED_EXTENSIONS), max_length=255, unique=True, validators=[full_domain_validator])
 
     def __str__(self):
         return self.dns
diff --git a/re2o/settings.py b/re2o/settings.py
index 8d15d917..51604a9d 100644
--- a/re2o/settings.py
+++ b/re2o/settings.py
@@ -12,7 +12,7 @@ https://docs.djangoproject.com/en/1.8/ref/settings/
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 import os
-from .settings_local import SECRET_KEY, DATABASES, DEBUG, ALLOWED_HOSTS
+from .settings_local import SECRET_KEY, DATABASES, DEBUG, ALLOWED_HOSTS, ALLOWED_EXTENSIONS
 
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))