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The new group, Top Level Domain Association, began accepting membership applications on 19 May.
The best-known TLDs are those recognised by the Internet Corporation for Assigned Names and Numbers (ICANN), including .com, .net, .edu and .org. But many others exist outside the authority of ICANN.
Leah Gallegos, a board member of the new group and president of AtlanticRoot Network, said the new association is being created to recognise all TLD holders, including alternative groups ignored by ICANN.
The problem is that some of ICANN's pending TLD designations, such as .biz, are already used as TLDs outside the official ICANN system. That will create havoc and domain name "collisions", Gallegos claimed.