On 23 Nov 2012, at 11:28, Tony Finch <d...@dotat.at> wrote:

> Are name servers allowed to leave out the SOA record?

Yes. Though it depends on what the question was, which server you ask and what 
data it has. RFC2308 lists some examples of valid NXDOMAIN/NODATA responses 
containing no SOA record.

> It would break negative cacheing.

So what?

It's not compulsory to implement or support that. Which would of course be a 
Bad Idea.

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