Because there are multiple root level servers no one person or organization controls the DNS for the world. It is also a distributed system so this would not be possible.
If a DNS server cannot find the answer to the DNS Query in its own database it will first query the forwarders (if there are any configured) and then ask the root server. root servers (by default) are the master DNS servers of the Internet.
DNS replication typically takes place automatically and continuously whenever changes to DNS records are made. This ensures that the updated information is spread across multiple DNS servers, providing redundancy and improving the availability of DNS services.
Static addresses are usually used for devices that are not mobile and need to be connected to a DNS name. That would be routers, gateways, web servers, DNS servers, printers, email servers, etc.
Mostly the internet is decentralized, except for DNS servers. DNS servers are servers that your computer requests when you goto a website with a domain name to get the IP to connect to. There are several cover-all DNS servers, such as Google DNS (8.8.8.8) and OpenDNS (208.67.222.222). Although you could create your own cover-all DNS server, it would be really expensive and time consuming. If you want to use the internet completely decentralized, then use IP addresses instead of domain names. For example, wiki.answers.com's ip address is 67.196.156.63, but they are hosting multiple websites on it so it isn't configured properly to use a IP address.
Select System Preferences... from the Apple menu. Click Network from the Internet & Network row. Click Configure... button at the bottom of the screen. Your DNS servers will be listed there.
top level
The prefered DNS server for the site is the server which sends the dns zone updates to all the other servers in the site. The primary DNS zone is created on the server and it has the authority to send changes in zone to other servers
Whenever mail servers talk to each other, they look for MX records at the destination's DNS. When a DNS server is setup for a domain and that domain has mail capabilities, their DNS server will have at least one MX record to denote which server handles mail. The root DNS servers for the internet denote the addresses for the SOA (start of authority) DNS servers for a particular domain.
In you're using Windows, open a terminal window (Start > Run > "cmd") Then type: "ipconfig /all" The DNS servers will be among the information listed. If you're asking about what a good DNS server to use, go with 8.8.8.8, that's Google's free public DNS server.
DNS Servers
DNS servers