there are many hundreds of root DNS servers around the world . And there are 13 organisation responsible for the management of these servers . In India , there are three root servers located in Mumbai , Delhi and Chennai .References : -http://www.iana.org/domains/root/servershttp://www.apnic.net/community/support/root-servershttp://blog.icann.org/2007/11/there-are-not-13-root-servers/
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
There are only 13 root hint servers and over 1000 root DNS servers avalable on the internet
DNS Servers
DNS servers
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Using reliable DNS servers is crucial to online success, for a regular website owner the most important of them are the name servers which are responsible for the online solution and with a static DNS you can rely on it instead of a random DNS server.
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.
There are in total 13 main Public-Root Servers.
There are many free DNS servers available. DNSadvantage, OpenDNS, and Norton are among the highest rated in terms of reliability. There is also ScrubIT, which is okay, though not as highly rated.
DomainDNSZones