diff --git a/apps/cistech-tunnel/shared/host-routing.sh b/apps/cistech-tunnel/shared/host-routing.sh
index 360a2a8..6016ab4 100644
--- a/apps/cistech-tunnel/shared/host-routing.sh
+++ b/apps/cistech-tunnel/shared/host-routing.sh
@@ -11,7 +11,7 @@ ACTION="${1:-start}"
 CONTAINER_IP="172.30.0.10"
 BRIDGE_NAME="br-cistech-vpn"
 TARGET_IP="${TARGET_IP:-10.3.1.0}"
-TARGET_SUBNET="10.3.1.0/24"
+TARGET_SUBNET="$(echo "$TARGET_IP" | cut -d. -f1-3).0/24"
 LAN_SUBNET="192.168.0.0/23"
 LAN_INTERFACES="eth0 eth1 wlan0"
 LOG_FILE="/var/log/cistech-routing.log"