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NSLOOKUP(1)
NAME
  nslookup - query Internet name servers interactively

SYNOPSIS
  nslookup [-option] [name | -] [server]

DESCRIPTION
  Nslookup is a program to query Internet domain name servers.	Nslookup has
  two modes: interactive 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.

  Options can also be specified on the command line if they precede the
  arguments and are prefixed with a hyphen. For example, to change the
  default query type to host information, and the initial timeout to 10
  seconds, type:

INTERACTIVE COMMANDS
  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 search list is used to qualify the
     name.

     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
     not implemented

  finger
     not implemented

  ls not implemented

  view
     not implemented

  help
     not implemented

  ?  not implemented

  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.
	Information about the current default server and host is also
	printed.

     class=value
	Change the query class to one of:

	IN the Internet class

	CH the Chaos class

	HS the Hesiod class

	ANY
	   wildcard

	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 debugging mode on. A lot more information is printed about the
	packet sent to the server and the resulting answer.

	(Default = nod2)

     domain=name
	Sets the search list to name.

     [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)

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

	(Default = 53; abbreviation = po)

     querytype=value

     type=value
	Change the type of the information query.

	(Default = A; abbreviations = q, ty)

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

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

     retry=number
	Set the number of retries to number.

     timeout=number
	Change the initial timeout interval for waiting for a reply to number
	seconds.

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

	(Default = novc)

FILES
  /etc/resolv.conf

SEE ALSO
  dig(1), host(1), named(8).

AUTHOR
  Andrew Cherenson

COPYRIGHT
  Copyright (C) 2004-2006 Internet Systems Consortium, Inc. ("ISC")

Index for Section 1

Alphabetical listing for N

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