BSD 2.11 - man page for nslookup (bsd section 1)

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NSLOOKUP(1)									      NSLOOKUP(1)

       nslookup - query name servers interactively

       nslookup [ host-to-find | - [ server address | server name ]]

       Nslookup  is  a	program  to  query  DARPA Internet domain name servers.  Nslookup has two
       modes: interactive and non-interactive.	Interactive mode allows the  user  to  query  the
       name  server  for information about various  hosts and domains or print a list of hosts in
       the domain.  Non-interactive mode is used to print just the name and Internet address of a
       host or domain.

       Interactive mode is entered in the following cases:

       a)  when no arguments are given (the default name server will be used), and

       b)  when  the first argument is a hyphen (-) and the second argument is the host name of a
	   name server.

       Non-interactive mode is used when the name of the host to be looked up  is  given  as  the
       first argument. The optional second argument specifies a name server.

       Commands  may be interrupted at any time by typing a control-C.	To exit, type a control-D
       (EOF).  The command line length must be less than 80  characters.   N.B.  an  unrecognized
       command will be interpreted as a host name.

       host [server]
	      Look up information for host using the current default server or using server if it
	      is specified.

       server domain
       lserver domain
	      Change the default server to domain.  Lserver uses the initial server  to  look  up
	      information  about  domain  while  server  uses  the current default server.  If an
	      authoritative answer can't be found, the names  of  servers  that  might	have  the
	      answer are returned.

       root   Changes  the  default  server  to the server for the root of the domain name space.
	      Currently, the host is used.  (This	command  is  a	synonym  for  the
	      lserver	The  name  of the root server can be changed with the set
	      root command.

       finger [name] [> filename]
       finger [name] [>> filename]
	      Connects with the finger server on the current host.  The current host  is  defined
	      when  a  previous lookup for a host was successful and returned address information
	      (see the set querytype=A command).  Name is optional.  > and >> can be used to  re-
	      direct output in the usual manner.

       ls domain [> filename]
       ls domain [>> filename]
       ls -a domain [> filename]
       ls -a domain [>> filename]
       ls -h domain [> filename]
       ls -h domain [>> filename]

       ls -d domain [> filename]
	      List  the information available for domain.  The default output contains host names
	      and their Internet addresses.  The -a option lists aliases of hosts in the  domain.
	      The  -h  option  lists CPU and operating system information for the domain.  The -d
	      option lists all contents of a zone transfer.  When output is directed to  a  file,
	      hash marks are printed for every 50 records received from the server.

       view filename
	      Sorts and lists the output of previous ls command(s) with more(1).


       ?      Prints a brief summary of commands.

       set keyword[=value]
	      This  command  is used to change state information that affects the lookups.  Valid
	      keywords are:

	      all    Prints the current values of the various options to set.  Information  about
		     the  current default server and host is also printed.

		     Turn  debugging  mode on. A lot more information is printed about the packet
		     sent to the server and the resulting answer.
		     (Default = nodebug, abbreviation = [no]deb)

	      [no]d2 Turn exhaustive debugging mode on.  Essentially all fields of  every  packet
		     are printed.
		     (Default = nod2)

		     Append the default domain name to every lookup.
		     (Default = defname, abbreviation = [no]def)

		     With defname, search for each name in parent domains of the current domain.
		     (Default = search)

		     Change the default domain name to name.  The default domain name is appended
		     to all lookup requests if the defname option has been set.  The search  list
		     is set to parents of the domain with at least two components in their names.
		     (Default = value in hostname or /etc/resolv.conf, abbreviation = do)


		     Change the type of information returned from a query to one of:

		     A	       the host's Internet address (the default).

		     CNAME     the canonical name for an alias.

		     HINFO     the host CPU and operating system type.

		     MD        the mail destination.

		     MX        the mail exchanger.

		     MG        the mail group member.

		     MINFO     the mailbox or mail list information.

		     MR        the mail rename domain name.

		     NS        nameserver for the named zone.
	      Other types specified in the RFC883 document are valid but aren't very useful.
	      (Abbreviation = q)

		     Tell the name server to query other servers if it does not have the informa-
		     (Default = recurse, abbreviation = [no]rec)

		     Set the number of retries to number.  When a  reply  to  a  request  is  not
		     received  within  a  certain  amount of time (changed with set timeout), the
		     request is resent.  The retry value controls how many  times  a  request  is
		     resent before giving up.
		     (Default = 2, abbreviation = ret)

		     Change the name of the root server to host. This affects the root command.
		     (Default =, abbreviation = ro)

		     Change the time-out interval for waiting for a reply to number seconds.
		     (Default = 10 seconds, abbreviation = t)

	      [no]vc Always use a virtual circuit when sending requests to the server.
		     (Default = novc, abbreviation = [no]v)

       If  the	lookup	request was not successful, an error message is printed.  Possible errors

	      The server did not respond to a request after a certain  amount  of  time  (changed
	      with  set  timeout=value)  and  a  certain  number  of  retries  (changed  with set

       No information
	      Depending on the query type set with the	set  querytype	command,  no  information
	      about the host was available, though the host name is valid.

       Non-existent domain
	      The host or domain name does not exist.

       Connection refused
       Network is unreachable
	      The  connection to the name or finger server could not be made at the current time.
	      This error commonly occurs with finger requests.

       Server failure
	      The name server found an internal inconsistency  in  its	database  and  could  not
	      return a valid answer.

	      The name server refused to service the request.

       The following error should not occur and it indicates a bug in the program.

       Format error
	      The name server found that the request packet was not in the proper format.

       /etc/resolv.conf    initial domain name and name server addresses.

       resolver(3), resolver(5), named(8), RFC882, RFC883

       Andrew Cherenson

4.3 Berkeley Distribution		November 21, 1987			      NSLOOKUP(1)
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