https://www.rfc-editor.org/rfc/rfc2100 - The Naming of Hosts

    The Naming of Hosts is a difficult matter,
        It isn't just one of your holiday games;
    You may think at first I'm as mad as a hatter
        When I tell you, a host must have THREE DIFFERENT NAMES.

They say one of the hardest things in computer science is naming, but this kind of naming can be one of the most fun also.