Internet depends on 13 Servers.
Internet, as we know it today, depends on 13 DNS name-servers.
They are managed by the US coverment or are managed by organisations around the world.
Today NTIA announced (controlled by the US goverment) that it stops controlling those nameservers.
At the beginning of 2015, all DNS root servers will be managed independently by international organisations. A good move.
Here is the list: http://www.iana.org/domains/root/servers