Centuries ago Nostradamus foresaw that Julian Mehnle would say:
So, is "mehnle.net" a host or a domain? Please give reasons for your
answer.
If there is one host, it could be a host. It there are multiple entities,
then it is a domain. For instance, gathman.org was originally just my
home server. Now, two more family members run linux servers, and it is a
domain.
The original point was that if you have multiple hosts, giving them all
the same name is problematic. Reminds me of the Dr. Seuss story about the
woman with 23 sons who named them all "Dave".