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I recently thought to myself why certain websites have very unique domain names.

Is it possible for a website to have for example instead of ?

Like for Stack Exchange, it has many different domain names? Is that what it's called? Domain names?

For example:


So if I want my website to have quite a few pages, can I actually create a website with


What is this actually called and is it possible?

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2 Answers 2

You need to understand what subdomains are.

When you purchase a domain, you purchase something like

If you see something like or, aboutus is just a subdomain of When you see something like, www is a subdomain of When you insert a dot (.), you create a subdomain.

When you purchase a domain like, you can create several subdomains and sub-subdomains (as you want). For your information, each subdomain represents a different website.

Stack Exchange doesn't have different domain names, the company has the domain name and several subdomains of it.

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Are . and / the same thing. could I go to – Qwertie Feb 23 '14 at 6:04
@Qwertieϟ . and / (subdomains and "subfolders") are implemented very differently technically. Whether a subdomain refers to a subfolder is dependent on the implementation. This is a common setup on some hosts, however, it is not always the case and is not the case with – w3d Feb 23 '14 at 17:09

Generally, when you see names instead of IP Addresses, they are called, in general "domain names". Thus:

  • is a domain name
  • is also a domain name
  • is also a domain name

The .com part is called a TLD (Top Level Domain). The example part is called 2LD (Second Level Domain) and so on. The higher level domains are generally called "subdomains" of the lower level ones. Thus, referring to the examples above:

  • sub is a subdomain of
  • srv is a subdomain of

Now, in a URI, the parts after the slash after the domain name, is handled by the server who is using the domain name. For example, if we have the URI, the browser contacts the server called using the HTTP protocol, informing the server that the browser wants to view an object located in /about (note the leading slash).

Is it possible to change the URI from to, let's say Yes, but one needs a different IP address to ensure that what's returned by the latter is different from what's returned by The reason is that HTTP version 1.0 don't provide the full URI in its request, only HTTP version 1.1 actually provide the full URI. Thus, a browser not supporting HTTP version 1.1 will cause the server to be confused and likely receives the wrong page.

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