diff --git a/api/serializers.py b/api/serializers.py
index a4fa57bc..ba14dde5 100644
--- a/api/serializers.py
+++ b/api/serializers.py
@@ -673,7 +673,7 @@ class SubnetPortsOpenSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = machines.IpType
-        fields = ('type', 'domaine_ip_start', 'domaine_ip_stop', 'prefix_v6', 'ouverture_ports')
+        fields = ('type', 'domaine_ip_start', 'domaine_ip_stop', 'complete_prefixv6', 'ouverture_ports')
 
 # DHCP
 
diff --git a/machines/models.py b/machines/models.py
index 2f5a6a62..007317e6 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -336,6 +336,11 @@ class IpType(RevMixin, AclMixin, models.Model):
         else:
             return None
 
+    @cached_property
+    def complete_prefixv6(self):
+        """Return the complete prefix v6 as cidr"""
+        return str(self.prefix_v6) + "/" + str(self.prefix_v6_length)
+
     def ip_objects(self):
         """ Renvoie tous les objets ipv4 relié à ce type"""
         return IpList.objects.filter(ip_type=self)