Getting the name of responding server(s)

[Matus UHLAR - fantomas]

>>On Tue, Sep 07, 2021 at 10:48:57AM -0400,
>> Matthew Pounsett <matt at conundrum.com> wrote a message of 32 lines which
>> said:
>>> Yeah, you can pretty reliably get the answer in one or two steps by
>>> requesting the NS set for the FQDN.  You'll either get your answer, or
>>> get an SOA with the name of the enclosing zone.  Second lookup gets
>>> you the NS set for the enclosing zone.

>In message <YTm5xuAtW6fKpSO7 at nic.fr>, Stephane Bortzmeyer
> <bortzmeyer at nic.fr> wrote:
>>Indeed (unless you find a broken resolver that fail to send the SOA).

On 09.09.21 03:20, Ronald F. Guilmette wrote:
>I don't want and don't need SOA records.  I want and need only the relevant
>NS records.

server in some cases send the SOA. 

>>I was thinking of another issue: if the goal of the OP is to find
>>which domain names are on the same authoritative name servers...
>
>Thank you but no, that was not among my goals.
>
>I just want the names of the final and actual name servers that would /
>should respond to the given query.

dig +trace finds those.

Note that some domains can be horribly broken and different nameservers can
send different NS, or no NS at all but SOA.


>>asking
>>the NS may not be sufficient, if a name server is known by several
>>names (for instance, a.nic.sex and a.nic.sucks are the same
>>machine). So, the OP may have to do a resolution of nameservers' names
>>into IP addresses, as well.
>
>Thank you.  I am well and truly aware of that fact that multiple name
>server names may resolve to some single common IP address.
>
>Fortunately, for what I am doing, this fact is not of any relevance.

what exactly is your goal?

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