diff --git a/playbooks/roles/common/defaults/main.yml b/playbooks/roles/common/defaults/main.yml
index 4167d8fed..314835802 100644
--- a/playbooks/roles/common/defaults/main.yml
+++ b/playbooks/roles/common/defaults/main.yml
@@ -8,10 +8,10 @@ auth_username: "octavia"
 auth_project_name: "service"
 lb_mgmt_net_name: "lb-mgmt-net"
 lb_mgmt_subnet_name: "lb-mgmt-subnet"
-lb_mgmt_subnet_cidr: "192.168.199.0/24"
-lb_mgmt_subnet_gateway: "192.168.199.1"
-lb_mgmt_subnet_pool_start: "192.168.199.50"
-lb_mgmt_subnet_pool_end: "192.168.199.200"
+lb_mgmt_subnet_cidr: "172.24.0.0/16"
+lb_mgmt_subnet_gateway: "172.24.0.1"
+lb_mgmt_subnet_pool_start: "172.24.0.2"
+lb_mgmt_subnet_pool_end: "172.24.255.254"
 lb_mgmt_sec_grp_name: "lb-mgmt-sec-grp"
 lb_health_mgr_sec_grp_name: "lb-health-mgr-sec-grp"
 mgmt_port_dev: "o-hm0"
diff --git a/releasenotes/notes/releasenotes/notes/update-lb-mgmt-subnet-to-class-b-1cd832ef08a30c85.yaml b/releasenotes/notes/releasenotes/notes/update-lb-mgmt-subnet-to-class-b-1cd832ef08a30c85.yaml
new file mode 100644
index 000000000..10432b145
--- /dev/null
+++ b/releasenotes/notes/releasenotes/notes/update-lb-mgmt-subnet-to-class-b-1cd832ef08a30c85.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  -
+    Enhance lb-mgmt-subnet to be a class B subnet, so the global amount
+    of Octavia loadbalancers won't be constrained to a very low number.