Name Server (NS) Records
Name Server (NS) records identify which computers in a DNS database are the name servers, essentially the DNS servers for a particular zone. Although there can be only one SOA record for a zone, there can be multiple NS records for the zone, which indicate to clients which machines are available to run DNS queries against for that zone.
Note
Name Server records, or NS records, do not actually contain the IP information of a particular resource. In fact, in most cases, only A records contain this information. NS records and other similar records simply point to a server’s A record. For example, an NS record will simply point to dc1.companyabc.com, which will then direct the query to the dc1 A record in the companyabc.com ...
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