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What is a Hostname, a Domain and a FQDN?
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A Fully Qualified Domain Name (FQDN) links to an IP address of a server. The Internet address may be composed of letters and numbers, by using this option nobody has to remember the difficult number sequence (IP).

A FQDN is divided in three levels:
1) The appendage of the domain is the Top Level Domain (TLD). Example: net, com or eu
2) The domain name will be inserted in front of the TLD. Example: openemm or agnitas
3) At the very first stands the hostname. For webpages mostly: www

Example:
The FQDN www.yourcompany.com is composed of:
- www = hostname
- yourcompany = domain name
- com = TLD

As you can see, the FQDN consists of the hostname, the domain and the top level domain separated by dots. Finally the server IP address (i.e. 172.16.13.52) will be replaced by the addressable www.yourcompany.com address.

The FQDN can be expanded with a subdomain (i.e. miami). The subdomain will be inserted between the hostname and the domain name. Example:
www.miami.yourcompany.com
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