diff --git a/terraform/modules/network/main.tf b/terraform/modules/network/main.tf
index 0debc0b..2633628 100644
--- a/terraform/modules/network/main.tf
+++ b/terraform/modules/network/main.tf
@@ -7,21 +7,21 @@ resource "google_compute_network" "vpc" {
 resource "google_compute_subnetwork" "frontend_network" {
   name          = "mon-frontend"
   network       = google_compute_network.vpc.id
-  ip_cidr_range = "10.0.1.0/24"
+  ip_cidr_range = var.frontend_cidr
   region        = var.region
 }
 
 resource "google_compute_subnetwork" "backend_network" {
   name          = "mon-backend"
   network       = google_compute_network.vpc.id
-  ip_cidr_range = "10.0.2.0/24"
+  ip_cidr_range = var.backend_cidr
   region        = var.region
 }
 
 resource "google_compute_subnetwork" "database_network" {
   name          = "mon-database"
   network       = google_compute_network.vpc.id
-  ip_cidr_range = "10.0.3.0/24"
+  ip_cidr_range = var.database_cidr
   region        = var.region
 }