[dns-operations] underline in TXT's host

Stephane Bortzmeyer bortzmeyer at nic.fr
Fri Dec 14 08:44:41 UTC 2012

On Fri, Dec 14, 2012 at 04:37:05PM +0800,
 Feng He <fenghe at nsbeta.info> wrote 
 a message of 17 lines which said:

> does the TXT record allow a underline in its hostname?

1) What is on the left side is not always a host name, far from it (if
you have learned in a book that DNS is here to "map host names to IP
addresses", burn the book immediately, it was written by someone who
does not know the DNS).

2) Domain names can have almost any character, and it does not depend
on the record type. If you have learned that DNS allows only LDH in
domain names, burn the book again and read instead RFC 2181, section

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