Questions about NAPTR

Karl Auer kauer at
Tue Sep 19 04:51:28 UTC 2017

On Tue, 2017-09-19 at 13:56 +1000, Mark Andrews wrote:
> In message <1505734269.2518.70.camel at>, Karl Auer
> writes:
> > And is it true that "if the Regexp field is not empty, the
> > Replacement field will not be used"?
> With the current flags no but who know what will happen in the
> future.

Not sure what "no" means. My fault for putting up a statement with two

It seems to me that the output from a NAPTR is EITHER the result of
applying a regexp to the left-hand side domain name, OR the value of
the replacement field. I.e., they are mutually exclusive. So if the
regexp is empty, the replacement is used verbatim. If the regexp is NOT
empty, the replacement is ignored (but still has to conform to domain
name syntax, hence the need for a dot).

Is that understanding correct?

Thanks, K.

Karl Auer (kauer at

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