A Fully Qualified Domain Name (FQDN) serves the clear regulation one ''' knot ''' in the name area of the hierarchically developed DNS.

Structure

The entire representation of the DNS of name area takes place as a root tree (see graph theory).

Each knot possesses a name (a label), which is not clear without the indication of a complete (Fully Qualified) name. Thus for example the position of the knot cannot be determined "“wikipedia"” clearly, since this knot name emerges on the one hand under wikipedia.org and on the other hand under wikipedia.de. With the knot "“www"” becomes still more descriptive, that only in connection with a clear name (e.g. www.wikipedia.de.) is identifiable. Which label are technically permissible, is fixed in the rules of the Domain Name of system (DNS).

Each knot possesses FQDN. In the case of the Top level Domain de their FQDN de reads. - reads the FQDN of the root root. (exactly one point).

Notation

The notation of a FQDN takes place via the lining up of the labels of all knots separately via one point and from left to right from the lowest knot to the root root.

         (root) label of the 0. Even one, zero-label/\/\ de org"… labels of the 1. Even one, Top level Domains (TLD)/|/| wikipedia wikipedia"… labels of the 2. Even one, Second level Domains and host name directly under a TLD//\ www de EN labels of the 3, level, Third level Domains and host name under 2nd level Domains"…/(arbitrarily expandable) 

The label is the designator of a knot. With exception of the knot root each knot possesses Label.Das label of roots is an empty character string, also zero-label mentioned.

The FQDN of www.wikipedia.de. arises through:

3rd-level-label.2nd-level-label.1st-level-label.root-label and reads thereby www .wikipedia .de.  

Since root possesses only an empty label, thus always ends the FQDN with one point.

Articles in category "Fully Qualified Domain Name"

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  For example, given a device with a hostname of "myhost" and a domain name of "example.com", the fully qualified domain name is "myhost.example.com.". ...


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• What is FQDN - A Word Definition From the Webopedia Computer ...
  For example, www.webopedia.com is a fully qualified domain name. www is the host, webopedia is the second-level domain, and.com is the top level domain. ...