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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

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)

	       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)

FILES
       /etc/resolv.conf

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

AUTHOR
       Andrew Cherenson

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

BIND9				 Jun 30, 2000			   NSLOOKUP(1)

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