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Validates that a value is a valid CIDR (Classless Inter-Domain Routing) notation. By default, this will validate the CIDR's IP and netmask both for version 4 and 6, with the option of allowing only one type of IP version to be valid. It also supports a minimum and maximum range constraint in which the value of the netmask is valid.

Applies to property or method
Class Cidr
Validator CidrValidator

Basic Usage

  • Attributes
  • YAML
  • XML
  • PHP
// src/Entity/NetworkSettings.php
namespace App\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class NetworkSettings
    protected $cidrNotation;


As with most of the other constraints, null and empty strings are considered valid values. This is to allow them to be optional values. If the value is mandatory, a common solution is to combine this constraint with NotBlank.



type: array | string

It defines the validation group or groups of this constraint. Read more about validation groups.


type: string default: This value is not a valid CIDR notation.

This message is shown if the string is not a valid CIDR notation.


type: integer default: 0

It's a constraint for the lowest value a valid netmask may have.


type: string default: 32 for IPv4 or 128 for IPv6

It's a constraint for the biggest value a valid netmask may have.


type: string default: The value of the netmask should be between {{ min }} and {{ max }}.

This message is shown if the value of the CIDR's netmask is bigger than the netmaskMax value or lower than the netmaskMin value.

You can use the following parameters in this message:

Parameter Description
{{ min }} The minimum value a CIDR netmask may have
{{ max }} The maximum value a CIDR netmask may have


type: mixed default: null

This option can be used to attach arbitrary domain-specific data to a constraint. The configured payload is not used by the Validator component, but its processing is completely up to you.

For example, you may want to use several error levels to present failed constraints differently in the front-end depending on the severity of the error.


type: string default: all

This determines exactly how the CIDR notation is validated and can take one of these values:

  • 4: validates for CIDR notations that have an IPv4;
  • 6: validates for CIDR notations that have an IPv6;
  • all: validates all CIDR formats.
This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.
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