About
The NS record are DNS record that identifies the DNS nameserver.
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Query
For instance, if we want to known the nameserver of google , we can DNS query the NS record with nslookup and the following command:
nslookup -type=NS google.com
google.com nameserver = ns2.google.com
google.com nameserver = ns3.google.com
google.com nameserver = ns4.google.com
google.com nameserver = ns1.google.com
Update
The NS record are controlled by your registrar and they should provide you with a mean to update them.