diff --git a/stack.sh b/stack.sh
index 47d93bd..d067406 100755
--- a/stack.sh
+++ b/stack.sh
@@ -260,7 +260,7 @@
 # from either range when attempting to guess the IP to use for the host.
 # Note that setting FIXED_RANGE may be necessary when running DevStack
 # in an OpenStack cloud that uses either of these address ranges internally.
-FLOATING_RANGE=${FLOATING_RANGE:-172.24.4.224/28}
+FLOATING_RANGE=${FLOATING_RANGE:-172.24.4.0/24}
 FIXED_RANGE=${FIXED_RANGE:-10.0.0.0/24}
 FIXED_NETWORK_SIZE=${FIXED_NETWORK_SIZE:-256}