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NSLOOKUP(8)			   BSD System Manager's Manual			      NSLOOKUP(8)

NAME
     nslookup -- query Internet name servers interactively

SYNOPSIS
     nslookup [-option ...] [host-to-find | -[server]]

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

ARGUMENTS
     Interactive mode is entered in the following cases:

     1.   when no arguments are given (the default name server will be used),

     2.   when the first argument is a hyphen ('-') and the second argument is the host name or
	  Internet address of a name server.

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

     The options listed under the ``set'' command below can be specified in the .nslookuprc file
     in the user's home directory if they are listed one per line.  Options can also be specified
     on the command line if they precede the arguments and are prefixed with a hyphen.	For exam-
     ple, to change the default query type to host information, and the initial timeout to 10
     seconds, type:

		   nslookup -query=hinfo  -timeout=10

INTERACTIVE COMMANDS
     Commands may be interrupted at any time by typing a control-C.  To exit, type a control-D
     (EOF) or type exit.  The command line length must be less than 256 characters.  To treat a
     built-in command as a host name, precede it with an escape character ('\').  N.B.:
     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
	      specified.  If host is an Internet address and the query type is A or PTR, the name
	      of the host is returned.	If host is a name and does not have a trailing period,
	      the default domain name is appended to the name.	(This behavior depends on the
	      state of the set options domain, srchlist, defname, and search.)

	      To look up a host not in the current domain, append a period to the name.

     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 ns.internic.net is used.  (This command is a synonym for
	      ``lserver ns.internic.net''.)  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).  The name is optional.  > and >> can be used
	      to redirect output in the usual manner.

     ls [option] domain [> filename]

     ls [option] domain [>> filename]
	      List the information available for domain, optionally creating or appending to
	      filename.  The default output contains host names and their Internet addresses.
	      Option can be one of the following:

	      -t querytype
		    lists all records of the specified type (see querytype below).

	      -a    lists aliases of hosts in the domain; synonym for ``-t CNAME''.

	      -d    lists all records for the domain; synonym for ``-t ANY''.

	      -h    lists CPU and operating system information for the domain; synonym for ``-t
		    HINFO''.

	      -s    lists well-known services of hosts in the domain; synonym for ``-t WKS''.

	      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).

     help

     ?	      Prints a brief summary of commands.

     exit     Exits the program.

     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 frequently-used options to set.  Informa-
		       tion about the  current default server and host is also printed.

	      class=value
		       Change the query class to one of:

		       IN	 the Internet class

		       CHAOS	 the Chaos class

		       HESIOD	 the MIT Athena Hesiod class

		       ANY	 wildcard (any of the above)

		       The class specifies the protocol group of the information.

		       (Default = IN; abbreviation = cl)

	      [no]debug
		       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)

	      domain=name
		       Change the default domain name to name.	The default domain name is
		       appended to a lookup request depending on the state of the defname and
		       search options.	The domain search list contains the parents of the
		       default domain if it has at least two components in its name.  For exam-
		       ple, if the default domain is CC.Berkeley.EDU, the search list is
		       CC.Berkeley.EDU and Berkeley.EDU.  Use the ``set srchlist'' command to
		       specify a different list.  Use the ``set all'' command to display the
		       list.

		       (Default = value from hostname(1), /etc/resolv.conf, or LOCALDOMAIN;
		       abbreviation = do)

	      srchlist=name1/name2/...
		       Change the default domain name to name1 and the domain search list to
		       name1, name2, etc.  A maximum of 6 names separated by slashes ('/') can be
		       specified.  For example,

			     set srchlist=lcs.MIT.EDU/ai.MIT.EDU/MIT.EDU

		       sets the domain to lcs.MIT.EDU and the search list to the three names.
		       This command overrides the default domain name and search list of the
		       ``set domain'' command.	Use the ``set all'' command to display the list.

		       (Default = value based on hostname(1), /etc/resolv.conf, or LOCALDOMAIN;
		       abbreviation = srchl)

	      [no]defname
		       If set, append the default domain name to a single-component lookup
		       request (i.e., one that does not contain a period).

		       (Default = defname; abbreviation = [no]defname)

	      [no]search
		       If the lookup request contains at least one period but doesn't end with a
		       trailing period, append the domain names in the domain search list to the
		       request until an answer is received.

		       (Default = search; abbreviation = [no]sea)

	      port=value
		       Change the default TCP/UDP name server port to value.

		       (Default = 53; abbreviation = po)

	      querytype=value

	      type=value
		       Change the type of information query to one of:

		       A	 the host's Internet address.

		       CNAME	 the canonical name for an alias.

		       HINFO	 the host CPU and operating system type.

		       MINFO	 the mailbox or mail list information.

		       MX	 the mail exchanger.

		       NS	 the name server for the named zone.

		       PTR	 the host name if the query is an Internet address; otherwise,
				 the pointer to other information.

		       SOA	 the domain's ``start-of-authority'' information.

		       TXT	 the text information.

		       UINFO	 the user information.

		       WKS	 the supported well-known services.

		       Other types (ANY, AXFR, MB, MD, MF, NULL) are described in the RFC-1035
		       document.

		       (Default = A; abbreviations = q, ty)

	      [no]recurse
		       Tell the name server to query other servers if it does not have the infor-
		       mation.

		       (Default = recurse; abbreviation = [no]rec)

	      retry=number
		       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 timeout period is doubled and the request is resent.  The retry value
		       controls how many times a request is resent before giving up.

		       (Default = 4, abbreviation = ret)

	      root=host
		       Change the name of the root server to host.  This affects the ``root''
		       command.

		       (Default = ns.internic.net.; abbreviation = ro)

	      timeout=number
		       Change the initial timeout interval for waiting for a reply to number sec-
		       onds.  Each retry doubles the timeout period.

		       (Default = 5 seconds; abbreviation = ti)

	      [no]vc   Always use a virtual circuit when sending requests to the server.

		       (Default = novc; abbreviation = [no]v)

	      [no]ignoretc
		       Ignore packet truncation errors.

		       (Default = noignoretc; abbreviation = [no]ig)

ENVIRONMENT
     HOSTALIASES      file containing host aliases
     LOCALDOMAIN      overrides default domain

FILES
     /etc/resolv.conf		       initial domain name and name server addresses
     $HOME/.nslookuprc		       user's initial options
     /usr/share/misc/nslookup.help     summary of commands

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

     Timed out
	    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
	    retry=value'').

     No response from server
	    No name server is running on the server machine.

     No records
	    The server does not have resource records of the current query type for the host,
	    although the host name is valid.  The query type is specified with the ``set
	    querytype'' command.

     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 ls and finger requests.

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

     Refused
	    The name server refused to service the request.

     Format error
	    The name server found that the request packet was not in the proper format.  It may
	    indicate an error in nslookup.

SEE ALSO
     resolver(3), resolv.conf(5), named(8)

     P.V. Mockapetris, Domain Names - Concepts and Facilities, RFC 1034, Nov 1, 1987.

     P.V. Mockapetris, Domain Names - Implementation and Specification, RFC 1035, Nov 1, 1987.

AUTHORS
     Andrew Cherenson

BSD					  June 24, 1990 				      BSD
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