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As I know DNS server is for registering domain name.
For example, my webiste , www.mysite.com which is registerd
on DNS server by DNS server owner  so that people
can access my domain address in IE broswer  to access my webage.
Most Web Hosting company are DNS server owner, Is that right ?
They are registered  from International Internet committe to be
DNS server and provide service for user domain name registration , Is that right ?
So normally users' linux server computer can NOT  be DNS server because
users don't have right to register domain name into internet.

Or all DNS server is at telecom ISP service provider company who already
grant a right from its local goverment to be DNS server to connect
the global internet netweork, Is that right ?
And hosting company just buy and pay the service from ISP company to
provide domain name registration service for users ?

Just want to know what is the major role for every party in www internet world ?

Please advise
Duncan

I think the experts gave enough information.

Usually the DNS is a computer server that has a software installed on it, this software include a list of domain names and the IP Address for that domain.

This software usually listen on port 53 for incoming connections, when you give the browser a host name, for example: www.mysite.com, the browser don't know where is the server located, so the browser need to get this host IP Address, this is called resolving DNS, it connect to the DNS server and give it the domain name, the DNS server find the domain name in the list and give the server IP Address.

http://kb.iu.edu/data/adns.html
http://technet.microsoft.com/en-us/library/cc772774(v=ws.10).aspx

In the UK the registration scheme for the .uk TLD, is controlled by nominet.org.uk, it's independent from government and has been around for 20 years, see http://www.nominet.org.uk/about/background/history/

Nominet will allow almost anyone to become a UK registrar or simply register domains, on an ad-hoc basis, see:  http://www.nominet.org.uk/governance/members/   and for a list:  http://www.nominet.org.uk/registrars/becomeregistrar/taglist/

A number of colleagues in the past have been registrars in their own right, and all the medium / large companies I've worked for have been registrars, as they've needed to register up-to several thousand variants of the companies trading name(s) / brands, to prevent cyber-squatting.

Having a DNS server is another matter, almost every ADSL modem and router has the capability, let alone the servers you'll find in the average company. So most medium / large companies host their own DNS entries (slightly harder to hijack, and quicker). All that's required is that you nominate two devices (DNS servers) as responsible for owning a particular domain name, in it's DNS record.

Many smaller companies, and geeks, and part-time registras have their own DNS servers.

"so I beleive in every where in the world, even in China, all DNS server
is at ISP company who are under control by its local government, "
No.  But that may be true country TLDs.  I know that's the case for Canada, Tuvalu and some others, but I don't think that's the case for the US or the UK.

"I think no one can own DNS server conneted  to internet  with ICANN requirement
besides you are ISP company with govenment access grant."
I own a DNS server connected to the Internet.  It's how people find services offered by my network.

"So in other words, only big company can own DNS server to connect to internet..."
No, at least not in the US.  I can't speak for anywhere else.

"I connect to internet through my ISP such as AT & T in US,
and I type www.mysite.com on my IE broswer.

www.mysite.com will go to DNS server to check its domain name  validaity
Who will check it, AT & T 's  DNS server, Who will check it ?"

Your browser goes to an invisible DNS server called "root" (represented by a period - .) to ask how to find a DNS server responsible for the .com TLD.  The browser then goes to the .com DNS server and asks how to find a DNS server responsible for mysite.com.  Your browser then asks the mysite.com DNS server how to find the machine called www.mysite.com.  The browser then attempts to connect to that machine using port 80 (or 442, or whatever) and so it goes.  

This process is true for all DNS resolution, however the process is sped up by having DNS servers cache requests they've made recently so they can answer new requests faster.

My links describe - for some scenarios - what's involved in becoming a Domain Registrar.  Just about anyone can do it, but there are requirements that have to be met.

ICANN is an international organization established to monitor/manage domain names, among other things.

DNS servers are located all over the world.  What and where depend on what you're looking for.  I host my own DNS for my domain, but I don't have to, and many people don't.

I don't think so, but you might contact ICANN and ask them.

The DNS servers are numerous and are located at points all over the internet.  You can learn more about DNS servers here:
http://en.wikipedia.org/wiki/DNS_root_zone

A domain name registrar can grant you a license to use a domain name.  You pay then for this, usually a few dollars a year.

A domain name server is a computer on the internet that translates your domain name into the numeric URL that allows message routing around the internet.

Most hosting companies are either domain name registrars or have a relationship with one of the large registrar companies.  Domain name registrars are often hosting companies, too.  Some examples of DNS registrars include GoDaddy, Enom, TuCows, etc.

The requirements to be a DNS registrar vary by country, but they almost all start with ICANN.  Here's some information on some common TLDs:
http://www.verisigninc.com/en_US/products-and-services/domain-name-services/become-registrar/index.xhtml
...and...
http://www.ehow.com/how_5199679_become-domain-name-registrar.html

There are exceptions, such as:
http://www.nunames.nu/partners/registrar.cfm?g=en