ip address assignment

How the ip address assignment works? The router or ISP assigns the
unique IP address to the host, but it is based on the geographic
location? How to guarantee there is no two IP addresses the same in
the world?

Also, I wonder how the web site http://www.ip-adress.com/ identifies
the ip address of a host?

On Sat, 22 Mar 2008 20:18:57 -0700 (PDT), Steve <javacc2@gmail.com>
wrote:

>How the ip address assignment works? The router or ISP assigns the
>unique IP address to the host, but it is based on the geographic
>location? How to guarantee there is no two IP addresses the same in
>the world?

The Internet Assigned Numbers Authority allocates IP addresses to
regional Internet registries:

http://www.iana.org/numbers/

The regional Internet registries allocate IP addresses to
corporations, government agencies, Internet service providers, etc.
For example:

http://www.arin.net/index.shtml (North America)
http://www.ripe.net/ (Europe, Middle East, Central Asia)

>Also, I wonder how the web site http://www.ip-adress.com/ identifies
>the ip address of a host?

When you connect to the Internet, your Internet service provider
assigns you an IP address. If your computer connects directly to the
Internet, your computer gets the address. If your computer connects
to the Internet through a broadband router, your router gets the
address.

When you request information from a web site, the request includes
your IP address. Like the return address on a letter that you mail,
it tells the web site how to send the reply to you. A site like
http://www.ip-adress.com/ reads your IP address from the message that
you send to it.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com

On Mar 22, 10:18*pm, Steve <java...@gmail.com> wrote:
> How the ip address assignment works? The router or ISP assigns the
> unique IP address to the host, but it is based on the geographic
> location? How to guarantee there is no two IP addresses the same in
> the world?
>
> Also, I wonder how the web sitehttp://www.ip-adress.com/identifies
> the ip address of a host?

Router assigns IP addresses in a "private" IP address range that the
"standard" rules have reserved for this process (192.168.xxx.yyyy /
10.0.0.xxx are some examples.)

As for you ISP assigning IP addresses, each ISP would have their own
range of IP addresses and their assigning system (DHCP, PPPoE or
Static) will use this range.