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<?php $return = filter_var("223.255.255.255", FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE); var_dump($return); $return = filter_var("224.0.0.0", FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE); var_dump($return); $return = filter_var("224.0.0.2", FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE); var_dump($return); $return = filter_var("224.0.0.255", FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE); var_dump($return); $return = filter_var("224.0.1.0", FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE); var_dump($return); $return = filter_var("224.1.0.0", FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE); var_dump($return); $return = filter_var("225.0.0.0", FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE); var_dump($return);