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Old 14th September 2009
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jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
Posts: 7,977
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Your question is both a little off-topic, gamemaniac, and is unanswerable directly, as the answer is both "yes" and "no". So I'll try some indirect level-setting: Depending on the architecture of your application(s), and the infrastructure required to support them, a single IP address for multiple systems may or may not be required or desired.
In the simplest of network scenarios you may be familiar with, a simple NAT router can have a large network behind it, all sharing the same external IP address.

In a simple "web site hosting" service, most service providers commonly place hundreds or even thousands of small websites on the same server or set of servers. Each may have its own DNS name, but all share the same IP address(es).

For the most complex of global web applications, there might be multiple IP addresses sharing the same DNS name. Common examples are the big portal firms such as Google or Yahoo, but also large corporations with a global presence may do this as well. For example, IBM and Citibank do this. The dig(1) utility can show you this type of detailed DNS information.
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