diff --git a/tempest/api/network/test_networks.py b/tempest/api/network/test_networks.py
index bf80ff5..07c80a2 100644
--- a/tempest/api/network/test_networks.py
+++ b/tempest/api/network/test_networks.py
@@ -127,7 +127,7 @@
     def _get_allocation_pools_from_gateway(cls, ip_version):
         """Return allocation range for subnet of given gateway"""
         gateway = cls._get_gateway_from_tempest_conf(ip_version)
-        return [{'start': str(gateway + 2), 'end': str(gateway + 3)}]
+        return [{'start': str(gateway + 2), 'end': str(gateway + 6)}]
 
     def subnet_dict(self, include_keys):
         # Return a subnet dict which has include_keys and their corresponding