Root Domain Servers Page 2
The first type of DNS server is a root domain server. Root domain servers control everything of a certain domain extension, such as .com, .net, and .org. The servers that control those domain extensions are owned by the Network Information Center (InterNIC).
These special servers provide that any computer, or any other DNS server that we will talk about later, has access to a full database for these domain extensions. If you've ever thought about getting your own .com domain name, you'll have to buy one from InterNIC for $70. That covers the first two-year lease; the price will be $35 per year after that.