“NS” (Name Server) records specify the authoritative DNS servers for a domain.
The records above tie the domain name on the left to the names of specific machines responsible for name resolution on the right.
The specific machines must still have an Address record to identify their IP. Nameserver records for the Authoritative servers
MUST appear in the zone file for which the servers are Authoritative.
All internet records contain ‘IN’ which tell the DNS system that this is a TCP/IP (Internet) name/IP record as opposed to a Chaosnet resolution record.