IP addresses can be dynamically obtained based on names of domain name servers and can be sent to the client.

Figure 1 Querying for an NS record


http://localhost:7904/pages/31185199/02/31185199/02/resources/figure/cn_10_01_1430014_fig2.png

The DNS server finds the IP address corresponding to the name server
based on the configuration and sends the IP address to the client

This document is very well done

Does Huawei DNS Supporting IPv6 NS Record Query?

useful document, thanks