[dns-operations] underscores in domain names

[Tony Finch]

Jim Reid <jim at rfc1035.com> wrote:
> > On 12 Sep 2017, at 10:19, James Stevens <James.Stevens at jrcs.co.uk> wrote:
> >
> > It would be impossible to disagree - just interesting to see that
> > underscore in public names is astonishingly common - like SRV records,
> > so I assumed underscore was reasonably well supported.
>
> It is perfectly legal to use underscores in domain names. They can't be
> used in hostnames.

Nor in mail domains :-)

So if you put a _ in a fake TLD, you can't use it for very much ...

Tony.
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