vNetLoop.json

{
    "$schema": "http://schema.management.azure.com/schemas/2014-04-01-preview/VNET.json",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "location": {
            "type": "String",
            "defaultValue": "West Europe",
            "metadata": {
                "Description": "This is the region where the resources will be created"
            }
        },
        "virtualNetworkName": {
            "type": "string",
            "defaultValue": "ARMvNet",
            "metadata": {
                "Description": "This is the name of the Virtual Network, suffixed by the loop number"
            }
        },
        "addressPrefix": {
            "type": "array",
            "defaultValue": [
                "192.168.0.0/24",
                "192.168.1.0/24",
                "192.168.2.0/24"
            ],
            "metadata": {
                "Description": "The CIDR address space for your Virtual Networks in Azure"
            }
        },
        "DNSServerAddress": {
            "type": "array",
            "defaultValue": [
                "192.168.0.131",
                "192.168.0.132"
            ]

        }
    },

    "resources": [
        {
            "apiVersion": "2015-05-01-preview",
            "type": "Microsoft.Network/virtualNetworks",
            "name": "[concat(parameters('virtualNetworkName'), copyIndex(100))]",
            "location": "[parameters('location')]",
            "properties": {
                "addressSpace": {
                    "addressPrefixes": [
                        "[parameters('addressPrefix')[copyIndex()]]"
                    ]
                },
                "dhcpOptions": {
                    "dnsServers": "[parameters('DNSServerAddress')]"
                }
            },
            "copy": {
                "name": "vNetCopyLoop",
                "count": 3
            }

        }
    ]
}