How to delegate a sub-domain to other DNS servers [KB1300]: "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."
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