1.   But Roberts said it was unlikely that there would be a move to enforce or encourage any such rules for existing domains.

2.   Internet addresses can be valuable enough to attract speculators because most choice names within existing top-level domains are already claimed.

3.   So before ICANN creates new domains, trademark-owners argue, all the names in existing domains should first be used.

4.   Though existing domains like .com, .org and .net were created to differentiate Internet addresses, the distinctions have largely been lost.