Calculate IP Address Range

Does anyone know how to check IP address is within the subnet?

Requirement: User will enter the IP address. Using client script I need to check if the entered IP address is within IP range using subnet.

Any help or suggestion appreciated..!

Thanks

2 REPLIES 2

Have a look at the following links:

https://stackoverflow.com/questions/819355/how-can-i-check-if-an-ip-is-in-a-network-in-python

or try this code:

/**
	* Check if a given ip is in a network
	* @param string $ip IP to check in IPV4 format eg. 127.0.0.1
	* @param string $range IP/CIDR netmask eg. 127.0.0.0/24, also 127.0.0.1 is accepted and /32 assumed
	* @return boolean true if the ip is in this range / false if not.
	*/
	function ip_in_range( $ip, $range ) {
	if ( strpos( $range, '/' ) == false ) {
	$range .= '/32';
	}
	// $range is in IP/CIDR format eg 127.0.0.1/24
	list( $range, $netmask ) = explode( '/', $range, 2 );
	$range_decimal = ip2long( $range );
	$ip_decimal = ip2long( $ip );
	$wildcard_decimal = pow( 2, ( 32 - $netmask ) ) - 1;
	$netmask_decimal = ~ $wildcard_decimal;
	return ( ( $ip_decimal & $netmask_decimal ) == ( $range_decimal & $netmask_decimal ) );
	}

Reference: https://gist.github.com/tott/7684443

Thanks,
Dravvy

Please Hit Helpful or Correct depending on the impact of the response

Hi,

Take a look at Chuck Tomasi's script include for finding if an IP is in a network range. What he does should help you figure out what you need to do.

Good luck.

Thanks,

Cody