US questions net overhaul plans
Icann oversees much of the basic functionality of the net
Plans to offer hundreds of new web addresses as alternatives to .com have been criticised by the US government.
The Internet Corporation for Assigned Names and Numbers, which oversees net addresses has floated plans for the radical change to the existing system.
But the US Commerce department has questioned both the benefits and the costs of such a scheme.
Officials have also raised concerns about whether the plans will destabilise the current system.