diff --git a/test/500_weave_multi_cidr_test.sh b/test/500_weave_multi_cidr_test.sh
index 1e8a63a5..1ea8215c 100755
--- a/test/500_weave_multi_cidr_test.sh
+++ b/test/500_weave_multi_cidr_test.sh
@@ -11,7 +11,7 @@ assert_container_cidrs() {
     CIDRS="$@"
 
     # Assert container has attached CIDRs
-    assert_raises "weave_on $HOST ps | grep '^$CID [^ ]* $CIDRS$'"
+    assert_raises "weave_on $HOST ps $CID | grep '$CIDRS$'"
 }
 
 # assert_zone_records <host> <cid> <fqdn> <ip> [<ip> ...]
@@ -42,36 +42,41 @@ assert_bridge_cidrs() {
 
 start_suite "Weave run/start/attach/detach with multiple cidr arguments"
 
-weave_on $HOST1 launch
+weave_on $HOST1 launch -debug -iprange 10.2.3.0/24
 weave_on $HOST1 launch-dns 10.254.254.254/24
 
 # Run container with three cidrs
-CID=$(start_container $HOST1 10.2.1.1/24 10.2.2.1/24 10.2.3.1/24 --name=multicidr -h $NAME | cut -b 1-12)
+CID=$(start_container $HOST1 10.2.1.1/24 10.2.2.1/24 --subnet 10.2.3.0/24 --name=multicidr -h $NAME | cut -b 1-12)
 assert_container_cidrs $HOST1 $CID 10.2.1.1/24 10.2.2.1/24 10.2.3.1/24
 assert_zone_records $HOST1 $CID $NAME. 10.2.1.1 10.2.2.1 10.2.3.1
 
 # Remove two of them
-weave_on $HOST1 detach 10.2.1.1/24 10.2.3.1/24 $CID
+weave_on $HOST1 detach 10.2.1.1/24  --subnet 10.2.3.0/24 $CID
 assert_container_cidrs $HOST1 $CID 10.2.2.1/24
 assert_zone_records $HOST1 $CID $NAME. 10.2.2.1
 
 # Put them both back
-weave_on $HOST1 attach 10.2.1.1/24 10.2.3.1/24 $CID
+weave_on $HOST1 attach 10.2.1.1/24  --subnet 10.2.3.0/24 $CID
 assert_container_cidrs $HOST1 $CID 10.2.2.1/24 10.2.1.1/24 10.2.3.1/24
 assert_zone_records $HOST1 $CID $NAME. 10.2.2.1 10.2.1.1 10.2.3.1
 
 # Stop the container, restart with three IPs
 docker_on $HOST1 stop $CID
-weave_on $HOST1 start 10.2.1.1/24 10.2.2.1/24 10.2.3.1/24 $CID
+weave_on $HOST1 start 10.2.1.1/24 10.2.2.1/24  --subnet 10.2.3.0/24 $CID
 assert_container_cidrs $HOST1 $CID 10.2.1.1/24 10.2.2.1/24 10.2.3.1/24
 assert_zone_records $HOST1 $CID $NAME. 10.2.1.1 10.2.2.1 10.2.3.1
 
 # Expose some cidrs
-weave_on $HOST1 expose 10.2.1.2/24 10.2.2.2/24 10.2.3.2/24
+weave_on $HOST1 expose 10.2.1.2/24 10.2.2.2/24  --subnet 10.2.3.0/24
 assert_bridge_cidrs $HOST1 weave 10.2.1.2/24 10.2.2.2/24 10.2.3.2/24
 
 # Hide some cidrs
-weave_on $HOST1 hide 10.2.1.2/24 10.2.3.2/24
+weave_on $HOST1 hide 10.2.1.2/24  --subnet 10.2.3.0/24
 assert_bridge_cidrs $HOST1 weave 10.2.2.2/24
 
+# Now detach and run another container to check we have released IPs in IPAM
+weave_on $HOST1 detach --subnet 10.2.3.0/24 $CID
+CID2=$(start_container $HOST1 --subnet 10.2.3.0/24)
+assert_container_cidrs $HOST1 $CID2 10.2.3.1/24
+
 end_suite