WP_Http::is_ip_address( string $maybe_ip )

Determines if a specified string represents an IP address or not.

Description Description

This function also detects the type of the IP address, returning either ‘4’ or ‘6’ to represent a IPv4 and IPv6 address respectively. This does not verify if the IP is a valid IP, only that it appears to be an IP address.

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Parameters Parameters


(string) (Required) A suspected IP address.

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Return Return

(int|false) Upon success, '4' or '6' to represent a IPv4 or IPv6 address, false upon failure

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Source Source

File: wp-includes/class-http.php

	public static function is_ip_address( $maybe_ip ) {
		if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) ) {
			return 4;

		if ( false !== strpos( $maybe_ip, ':' ) && preg_match( '/^(((?=.*(::))(?!.*\3.+\3))\3?|([\dA-F]{1,4}(\3|:\b|$)|\2))(?4){5}((?4){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i', trim( $maybe_ip, ' []' ) ) ) {
			return 6;

		return false;

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Changelog Changelog

Version Description
3.7.0 Introduced.

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