Use in web site hosting
The domain name is a component of a uniform resource locator (URL) used to access web sites, for example:
- URL: http://www.example.net/index.html
- Top-level domain: net
- Second-level domain: example
- Hostname: www
A domain name may point to multiple IP addresses to provide server redundancy for the services offered, a feature that is used to manage the traffic of large, popular web sites.
Web hosting services, on the other hand, run servers that are typically assigned only one or a few addresses while serving websites for many domains, a technique referred to as virtual web hosting. Such IP address overloading requires that each request identifies the domain name being referenced, for instance by using the HTTP request header field Host:, or Server Name Indication
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