Already, some two billion people have access to the internet. Add all the televisions, phones, cars and household appliances that are currently being given internet access—plus, eventually, every book, pill case and item of inventory as well—and a world or two of addresses could easily be accounted for. Apart from providing locators for every person and thing on the planet and beyond, IPv6's huge address space makes routing traffic over the internet a good deal easier. ... Though a vast improvement, IPv6 is not without its problems.