diff --git a/gestion/ridtools.py b/gestion/ridtools.py
index 29d6aefe..f5b895cc 100644
--- a/gestion/ridtools.py
+++ b/gestion/ridtools.py
@@ -59,7 +59,7 @@ class Rid(object):
         if self.type == 'Inconnu':
             raise ValueError("rid inconnu : %d" % rid)
 
-        self.ipv4_dispo = (rid & (1 << 15)) == 0 and self.type != 'special' or self.rid in config.rid_machines_speciales
+        self.ipv4_dispo = (rid & (1 << 15)) == 0 and self.type != 'special' or self.rid in config.rid_machines_speciales or (rid & (1 << 14)) != 0
 
         self.priv = (rid & (1 << 14)) != 0