Alternatively referred to as a computer name or sitename, a hostname is the name of the computer you're currently logged into or visiting. Below is an example of a hostname, that is assigned to a computer connecting to the Internet using Comcast.
When referring to an Internet web page or location a hostname is more often referred to as a domain name. Hostname is also a command that can be run on some versions of Microsoft Windows and Linux.
Should I use "host name" or "hostname" in my writing?
When referring to a computer on a network, "hostname" should be written as one word with no space.