Are underscores no longer supported in Bind 9.4?

Jake Morrisey jmorrisey71 at
Sun Mar 4 06:48:12 UTC 2007

On 2/28/07, Mark Andrews <Mark_Andrews at> wrote:
>        No.  It's a 20 year old rule.  See RFC 952 and RFC 1123.
>        The later extends the syntax to allow leading digits.
>        Labels in hostnames are restricted to letters, digits and
>        hypens (LDH).

Thank you for the previous references.
As a followup are underscores allowed in CNAME records?  Are CNAME
records not bound by these RFCs?  I would think they would have the
same rules but the named-checkzone and the named-compilezone have no
problem with a CNAME having an underscore.


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