> On Aug 13, 2018, at 6:26 PM, John C Klensin <john-i...@jck.com> wrote:
>
> the string 128.0.0.1, is a domain name
Yes, it is the presentation form of the domain name whose
list of labels is: "128", "0", "0", "1". There is of course
no TLD named "1", so this domain is not registered, and it
would also not be a usable hostname, since many libraries
would treat it as a literal IP address instead. And yet
it is still a domain name.
Indeed in a non-public network, I'm free to provision a
".1" TLD, and even create hosts as sub-domains of this name:
example.128.0.0.1. IN A 192.0.2.1
perhaps making "128.0.0.1" an empty non-terminal.
--
Viktor.
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