PublicIpWithOutput.json

{
    "$schema": "http://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {},
    "variables": {},
    "resources": [
        {
            "apiVersion": "2015-06-15",
            "type": "Microsoft.Network/publicIPAddresses",
            "name": "testPublicIp",
            "location": "[resourceGroup().location]",
            "properties": {
                "publicIPAllocationMethod": "Dynamic",
                "dnsSettings": {
                    "domainNameLabel": "testdnsname99"
                }
            }
        }
    ],
    "outputs": {
        "testOutputUrl": {
            "type": "string",
            "value": "[reference('testPublicIp').dnsSettings.fqdn]"
        }
    }
}