Getting the name of responding server(s)

[Stephane Bortzmeyer]

On Tue, Sep 07, 2021 at 09:44:43AM +0200,
 Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote 
 a message of 34 lines which said:

> I'm not aware of a tool (free software or not) which does it. Some
> programming will be required.

Attached is an example program. Free software licence, whatever you
prefer. Requires Python and the dnspython library. For many many
requests, it would probably be better to parallelize it. 

% ./list-auth.py bortzmeyer.org www.bortzmeyer.org fr toto.tata.trucmachin.fx 3.3.1.0.6.8.0.0.0.0.0.0.0.0.0.0.7.0.0.0.8.4.3.1.c.7.6.0.1.0.0.2.ip6.arpa  lists.isc.org tristatelogic.com

bortzmeyer.org.: ns3.absolight.net. ns2.bortzmeyer.org. ns4.bortzmeyer.org. ns.eu.org. ns2.absolight.net. ns1.bortzmeyer.org. 

www.bortzmeyer.org.: ns2.absolight.net. ns1.bortzmeyer.org. ns3.absolight.net. ns2.bortzmeyer.org. ns4.bortzmeyer.org. ns.eu.org. 

fr.: d.nic.fr. e.ext.nic.fr. f.ext.nic.fr. g.ext.nic.fr. 

toto.tata.trucmachin.fx.: DOES NOT EXIST

3.3.1.0.6.8.0.0.0.0.0.0.0.0.0.0.7.0.0.0.8.4.3.1.c.7.6.0.1.0.0.2.ip6.arpa.: ns3.nic.fr. ns1.nic.fr. ns2.nic.fr. 

lists.isc.org.: ns.isc.afilias-nst.info. ns1.isc.org. ns3.isc.org. ns2.isc.org. 

tristatelogic.com.: t1.zoneedit.com. t2.zoneedit.com. 

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