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NSLOOKUP(1)			     BIND9			   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:

	   nslookup -query=hinfo  -timeout=10

       The -version option causes nslookup to print the	version	number and
       immediately exits.

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 on or off the display of the full response packet and any
	       intermediate response packets when searching.

	       (Default	= nodebug; abbreviation	= [no]deb)

	    [no]d2
	       Turn debugging mode on or off. This displays more about what
	       nslookup	is doing.

	       (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)

	   ndots=number
	       Set the number of dots (label separators) in a domain that will
	       disable searching. Absolute names always	stop searching.

	   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)

	    [no]fail
	       Try the next nameserver if a nameserver responds	with SERVFAIL
	       or a referral (nofail) or terminate query (fail)	on such	a
	       response.

	       (Default	= nofail)

RETURN VALUES
       nslookup	returns	with an	exit status of 1 if any	query failed, and 0
       otherwise.

FILES
       /etc/resolv.conf

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

AUTHOR
       Internet	Systems	Consortium, Inc.

COPYRIGHT
       Copyright (C) 2004-2007,	2010, 2013-2016	Internet Systems Consortium,
       Inc. ("ISC")

ISC				  2014-01-24			   NSLOOKUP(1)

NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | INTERACTIVE COMMANDS | RETURN VALUES | FILES | SEE ALSO | AUTHOR | COPYRIGHT

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