nameserver Name server IP address
Internet address (in dot notation) of a name server that the resolver should query.
Up to MAXNS (currently 3, see <resolv.h>) name servers may be listed, one per key-
word. If there are multiple servers, the resolver library queries them in the order
listed. If no nameserver entries are present, the default is to use the name server
on the local machine. (The algorithm used is to try a name server, and if the query
times out, try the next, until out of name servers, then repeat trying all the name
servers until a maximum number of retries are made.)