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Domain Name System (DNS)

The domain name system (DNS for its acronym in English) is a naming service that converts the known user domain (for example, "") into the respective IP address. If you send the domain name as a query in the address bar, the domain is translated from DNS and then the request is transferred to the appropriate server.

A domain consists of several parts:

  • DNS root
  • Top Level Domain (TDL)
  • Second level domain (SDL)
  • One or more subdomains
  • Hostname (hostname)

Top level domain (TLD)

The top-level domain, which represents the geographic mappings (country code top-level domain - ccTLD) is placed after the root level. Examples of this are:

  • «it is" for Spain
  • «from»For Germany
  • «fr»For France
  • «Item»For Italy.

The TLD can also represent institutions.

= "thumbcaption"> International Domain Statistics Comparison (March 2013)

Second level domain (SLD)

The second-level domain appears in the hierarchy after the DNS root and the TLD. This is usually the name of the service provided. Any combination of TLD and SLD must be unique in the world. Examples of this can be seen above.


All the following domains are subdomains. Subdomains can be, for example, an online store system under the domain (SLD) of your own website. This can be implemented in any way you prefer. Examples:

  • « »
  • «Online »
  • « »

Another use of subdomains is multi-language websites. This way you can clearly divide your page into different languages. Domains can look like this for different pages:

  • «it »(Spanish)
  • « »(German)
  • « »(English)
  • « »(French)

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