Questions about NAPTR

Karl Auer kauer at
Mon Sep 18 08:32:45 UTC 2017

I've been reading RFC2915 and have a couple of questions about NAPTR
records. I'm trying to do *basic* validation of data from a database
being processed into the DNS.

1: Can the Flags field be empty? It seems to me that it can be under
some circumstances.

2: Can the Replacement field be empty? It looks from the text and
examples as if it should always contain a complete domain name BUT that
if the Regexp field is not empty, the Replacement field will not be

3: Can the Regexp field be empty? It seems to me that it can be, in
which case the Replacement field will be used without alteration.

Regards, K.
Karl Auer (kauer at

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