[dns-operations] Limit on Name Servers & their IPs for a sub-domain

Mark Andrews marka at isc.org
Fri Jan 12 06:48:48 UTC 2018

More the priming query.  The only servers that make SOA queries for the root
automatically are other root servers (official or otherwise). You don’t need
the address records to fit to deal with those queries.

> On 12 Jan 2018, at 4:58 pm, Olafur Gudmundsson <ogud at ogud.com> wrote:
> On Thursday, 11 January, 2018 10:11, "James Stevens" <James.Stevens at jrcs.co.uk> said:
> > I am aware of the "traditional" limit of 13 NS records for a sub-domain,
> > is it considered that this still applies?
> >
> This was never a limit the number 13 comes from 
> it was the maximum number of NS records with glue that could be returned in a SOA query for the root zone
> and fit in 512 bytes. 
> (in the days when adding NS records to all answers was a good practice) 
> Olafur
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org

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