rest_is_ip_address( string $ip )

Determines if an IP address is valid.

Description Description

Handles both IPv4 and IPv6 addresses.

Parameters Parameters


(string) (Required) IP address.

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Return Return

(string|false) The valid IP address, otherwise false.

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Source Source

File: wp-includes/rest-api.php

function rest_is_ip_address( $ip ) {
	$ipv4_pattern = '/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/';

	if ( ! preg_match( $ipv4_pattern, $ip ) && ! Requests_IPv6::check_ipv6( $ip ) ) {
		return false;

	return $ip;

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Changelog Changelog

Version Description
4.7.0 Introduced.

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