nslookup
<networking> A {Unix} {utility program}, originally by Andrew
Cherenson, for querying {Internet} {domain name servers}. The
basic use is to find the {IP address} corresponding to a
given {hostname} (or vice versa). By changing the query type
(e.g. "set type=CNAME") other types of information can be
obtained including CNAME - the {canonical name} for an alias;
HINFO - the host {CPU} and {operating system} type; MINFO -
mailbox or mail list information; {MX} - {mail exchanger}
information; NS - the {name server} for the named zone; PTR -
the hostname if the query is an IP address, otherwise
the pointer to other information; SOA the domain's
start-of-authority information; TXT - text information; UINFO
- user information; WKS - supported {well-known services}.
Other types (ANY, AXFR, MB, MD, MF, NULL) are described in
{RFC 1035}.
(ftp://src.doc.ic.ac.uk/computing/operating-systems/unix/bsd-sources/usr.sbin/named/tools/nslookup/).
(1994-10-27)