[dns-operations] TLD(s) for private use

[John Levine]

In article <97ad36f6-4b83-8db9-1bab-e88466988e77 at jrcs.co.uk> you write:
>I've not yet seen any response as to why a prefix that includes one or 
>more UNDERSCORE wouldn't be a viable solution - e.g. "zz__" - or even 
>all "[LETTER][LETTER]__" - where "XN__" could be IDN?

Because you can't use underscores in hostnames.  Even if it's not on
the public Internet, you will run into too much software that
correctly refuses hostnames that aren't ldh.

R's,
John