Title: WP_Query::is_404
Published: April 25, 2014
Last modified: May 20, 2026

---

# WP_Query::is_404(): bool

## In this article

 * [Return](https://developer.wordpress.org/reference/classes/wp_query/is_404/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wp_query/is_404/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_query/is_404/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_query/is_404/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wp_query/is_404/?output_format=md#wp--skip-link--target)

Determines whether the query is a 404 (returns no results).

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wp_query/is_404/?output_format=md#return)󠁿

 bool Whether the query is a 404 error.

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wp_query/is_404/?output_format=md#source)󠁿

    ```php
    public function is_404() {
    	return (bool) $this->is_404;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/class-wp-query.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/class-wp-query.php#L4773)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/class-wp-query.php#L4773-L4775)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wp_query/is_404/?output_format=md#related)󠁿

| Used by | Description | 
| [is_404()](https://developer.wordpress.org/reference/functions/is_404/)`wp-includes/query.php` |

Determines whether the query has resulted in a 404 (returns no results).

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wp_query/is_404/?output_format=md#changelog)󠁿

| Version | Description | 
| [3.1.0](https://developer.wordpress.org/reference/since/3.1.0/) | Introduced. |

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