An NS record is an entry in the DNS zone file that specifies the host name of the DNS server authoritative for the zone. Every zone must contain at least one NS record.
When you create a new zone, an NS record is automatically created for the zone's name server, but if you intend to use a DNS server other than the default name server, you must change the NS record to reflect the name of that server.
Important: Create a Host (A) record before you create the NS record.
To add a Name Server (NS) record:
Note: Do not enter any alias (CNAME) names in the text box. Ensure that a corresponding host name (A) record exists for the host name specified in the NS record.
The List of Reverse Records page displays the new record.