The Fully Qualified Domain Name or FQDN which is also called as absolute domain name is used to specify a specific host in the DNS system. Even FQDN can be used for different resources it is generally used to identify and define hosts in computer networks via the DNS protocol. The FQDN provides a list of domain labels in the DNS hierarchy. It starts with the lowest level and goes up to the top-level domain (TLD) in the DNS hierarchy to fully specify the domain name.
Fully Qualified Domain Name (FQDN) Examples
There are different types of FQDN’s which are created according to the host and level. In the following example, we create an FQDN for a server that is under the wisetut.com domain.
server.wisetut.comGenerally, a top-level domain contains multiple hosts and these hosts can be numbered like “server1”, “server2”, “server3” etc.
server1.wisetut.comThe FQDN’s can be specified as multilevel like below. In the following example, we specify a server in the database servers or domain.
server.database.wisetut.comPartially Qualified Domain Name (PQDN) vs Fully Qualified Domain Name (FQDN)
The Partially Qualified Domain Name or PQDN is used to describe some part of the Fully Qualified Domain Name. This means the PQDN consist of some part of the FQDN and it is resolved relatively. For example, if a host tries to solve server.wisetut.com and it is also in the wisetut.com domain using only server is enough which is called PQDN.
| Fully Qualified Domain Name (FQDN) | Partially Qualified Domain Name (PQDN) |
|---|---|
| server1.wisetut.com | server1 |
| server.database.wisetut.com | server.database |
Ping FQDN
FQDN names are resolved into the IP addresses in order to use for different cases. An FQDN can be pinged by using the ping command. The specified FQDN was converted into the IP address and ping packets were sent to this IP address.
$ ping sof02s31-in-f14.1e100.net