How to delegate a sub-domain to other DNS servers

To do this, you need to add NS-records for the sub-domain name pointing to the host names of the DNS servers hosting the sub-domain -  in the parent zone.

In the "DNS records" window right-click the parent zone in the left list and select "New NS-record":


In the "New NS-record" dialog, enter the sub-domain name and the host name of one of the DNS servers hosting the sub-domain:



Repeat the previous steps, so that you have an NS-record for each DNS server hosting the sub-domain:



Note that it is important that matching A-records exist for DNS server host names listed in these NS-records.
For the example above, A-records must exist for "ns1.otherdomain.com" and "ns2.otherdomain.com" - in the "otherdomain.com" zone on whatever DNS server is hosting "otherdomain.com".

If the DNS server host names are themselves sub-names of the domain name being delegated, it is necessary to include a copy of these A-records in the parent zone. These are called "glue records".
Otherwise other DNS servers will have no way to find the sub-domain's DNS servers, and therefore no way to resolve records in the sub-domain.
In the screen shot below, the highlighted A-records are such "glue records":

REFERENCE:
For more information, please see the following knowledge base article:

KB Article How to sub-delegate a reverse zone

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Picture #3 seems to be wrong. There should be an A record for ns1.otherdomain.com, and ns2, just like the text under the picture explains
david (May 18, 2016 at 1:29 PM)
No - it is not possible to have records for another domain in the zone. Those records belong in the "otherdomain.com" zone - wherever that is hosted.
That is also what the text under the picture states - if you read the paragraph to the end.

JH Software (September 2, 2016 at 7:43 AM)
Is it beneficiary to host each sub domain separately?
Actually I have a domain like example.com and having many sub domains like sub1.example.com, I hosted all the sub domains with primary domain and having same name servers for all the sub domains and to main domain. Now someone suggested me to keep seperate name servers for each sub domain. Is it helpful or not? and How? Can you please answer me.

Lallabi Innovations (December 28, 2016 at 4:22 AM)
If you have no specific reason to do so - then no.
The typical reason for doing so is that you want to delegate responsibility for the sub-zone to someone else.
You might also consider it if the sub-zones are very large - and therefore easier to manage as separate zones.

JH Software (January 9 at 3:56 AM)

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