diff --git a/etc/python/ip.py b/etc/python/ip.py
index e5f36ae..e443194 100644
--- a/etc/python/ip.py
+++ b/etc/python/ip.py
@@ -34,9 +34,13 @@ def ips_of_metadata(clients, vlan='adm'):
     ``clients`` est une liste de ClientMetadata, qui peut être obtenue via
     metadata.query.by_groups (ou similaire)
     """
+    if vlan not in ['adm', 'adh']:
+        raise NotImplementedError('Seul adm et adh sont supportés')
     out = []
     for client in clients:
         host = client.hostname
+        if vlan == 'adh':
+            host = host.split('.', 1)[0] + '.crans.org'
         for res in socket.getaddrinfo(host, None, socket.AF_UNSPEC, socket.SOCK_STREAM):
 #            if res[0] == socket.AF_INET6:
 #                suffix = '/128'