diff --git a/gestion/numeros_disponibles.py b/gestion/numeros_disponibles.py
index 40c04662..0e912e22 100644
--- a/gestion/numeros_disponibles.py
+++ b/gestion/numeros_disponibles.py
@@ -54,11 +54,11 @@ def update_ip(plage, occupees):
         for i in ip:
             n.append(int(i))
         while 1:
-            if n[3] < 255:
+            if n[3] < 254:
                 n[3] += 1
             else:
                 n[2] += 1
-                n[3] = 0
+                n[3] = 1
                 if n[2] == 255: break
             ip = "%d.%d.%d.%d" % tuple(n)
             if not AddrInNet(ip, ne):