Public IP address name must be valid

April 25, 2025 · View on GitHub

SYNOPSIS

Azure Resource Manager (ARM) has requirements for Public IP address names.

DESCRIPTION

When naming Azure resources, resource names must meet service requirements. The requirements for Public IP names are:

Between 1 and 80 characters long.
Alphanumerics, underscores, periods, and hyphens.
Start with alphanumeric.
End alphanumeric or underscore.
Public IP names must be unique within a resource group.

RECOMMENDATION

Consider using names that meet Public IP naming requirements. Additionally consider naming resources with a standard naming convention.

EXAMPLES

Configure with Bicep

To deploy Public IP Addresses that pass this rule:

Set the name property to a string that matches the naming requirements.
Optionally, consider constraining name parameters with minLength and maxLength attributes.

For example:

@minLength(1)
@maxLength(80)
@description('The name of the resource.')
param name string

@description('The location resources will be deployed.')
param location string = resourceGroup().location

// An example zone redundant public IP address
resource pip 'Microsoft.Network/publicIPAddresses@2024-05-01' = {
  name: name
  location: location
  sku: {
    name: 'Standard'
    tier: 'Regional'
  }
  properties: {
    publicIPAddressVersion: 'IPv4'
    publicIPAllocationMethod: 'Static'
    idleTimeoutInMinutes: 4
  }
  zones: [
    '1'
    '2'
    '3'
  ]
}

Configure with Azure template

To deploy Public IP Addresses that pass this rule:

Set the name property to a string that matches the naming requirements.
Optionally, consider constraining name parameters with minLength and maxLength attributes.

For example:

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "metadata": {
    "_generator": {
      "name": "bicep",
      "version": "0.34.44.8038",
      "templateHash": "4505554909350000802"
    }
  },
  "parameters": {
    "name": {
      "type": "string",
      "minLength": 1,
      "maxLength": 80,
      "metadata": {
        "description": "The name of the resource."
      }
    },
    "location": {
      "type": "string",
      "defaultValue": "[resourceGroup().location]",
      "metadata": {
        "description": "The location resources will be deployed."
      }
    }
  },
  "resources": [
    {
      "type": "Microsoft.Network/publicIPAddresses",
      "apiVersion": "2024-05-01",
      "name": "[parameters('name')]",
      "location": "[parameters('location')]",
      "sku": {
        "name": "Standard",
        "tier": "Regional"
      },
      "properties": {
        "publicIPAddressVersion": "IPv4",
        "publicIPAllocationMethod": "Static",
        "idleTimeoutInMinutes": 4
      },
      "zones": [
        "1",
        "2",
        "3"
      ]
    }
  ]
}

NOTES

This rule does not check if Public IP names are unique.