diff --git a/cmdb-api/api/lib/cmdb/ipam/subnet.py b/cmdb-api/api/lib/cmdb/ipam/subnet.py
index c718cb95..835ba09d 100644
--- a/cmdb-api/api/lib/cmdb/ipam/subnet.py
+++ b/cmdb-api/api/lib/cmdb/ipam/subnet.py
@@ -205,7 +205,7 @@ def validate_cidr(self, parent_id, cidr, _id=None):
         return cidr
 
     def _add_subnet(self, cidr, **kwargs):
-        kwargs[SubnetBuiltinAttributes.HOSTS_COUNT] = ipaddress.ip_network(cidr).num_addresses - 2
+        kwargs[SubnetBuiltinAttributes.HOSTS_COUNT] = len(list(ipaddress.ip_network(cidr).hosts()))
         kwargs[SubnetBuiltinAttributes.USED_COUNT] = 0
         kwargs[SubnetBuiltinAttributes.ASSIGN_COUNT] = 0
         kwargs[SubnetBuiltinAttributes.FREE_COUNT] = kwargs[SubnetBuiltinAttributes.HOSTS_COUNT]
diff --git a/docker-compose.yml b/docker-compose.yml
index e84501aa..45d1a3ab 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -41,7 +41,7 @@ services:
           - redis
 
   cmdb-api:
-    image: registry.cn-hangzhou.aliyuncs.com/veops/cmdb-api:2.4.14
+    image: registry.cn-hangzhou.aliyuncs.com/veops/cmdb-api:2.4.15
     container_name: cmdb-api
     env_file:
       - .env
@@ -71,7 +71,7 @@ services:
         flask cmdb-init-acl
         flask init-import-user-from-acl
         flask init-department
-        nohup flask cmdb-patch -v 2.4.14 &
+        nohup flask cmdb-patch -v 2.4.15 &
         flask cmdb-counter > counter.log 2>&1
     networks:
       new:
@@ -84,7 +84,7 @@ services:
       test: "ps aux|grep -v grep|grep -v '1 root'|grep gunicorn || exit 1"
 
   cmdb-ui:
-    image: registry.cn-hangzhou.aliyuncs.com/veops/cmdb-ui:2.4.14
+    image: registry.cn-hangzhou.aliyuncs.com/veops/cmdb-ui:2.4.15
     container_name: cmdb-ui
     depends_on:
       cmdb-api: