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NSLOOKUP(1)			    BIND 9			   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
       prints just the name and	requested information for a host or domain.

ARGUMENTS
       Interactive mode	is entered in the following cases:

       a. when no arguments are	given (the default name	server is used);

       b. 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 sec-
       ond 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, with an initial timeout	of  10
       seconds,	type:

	  nslookup -query=hinfo	 -timeout=10

       The -version option causes nslookup to print the	version	number and im-
       mediately exit.

INTERACTIVE COMMANDS
       host [server]
	      This command looks up information	for host using the current de-
	      fault server or using server, if specified. If host is an	Inter-
	      net 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 pe-
	      riod (.),	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
	      These commands 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 an-
	      swer cannot be found, the	names of servers that might  have  the
	      answer are returned.

       root   This command is not implemented.

       finger This command is not implemented.

       ls     This command is not implemented.

       view   This command is not implemented.

       help   This command is not implemented.

       ?      This command is not implemented.

       exit   This command exits the program.

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

	      all    This keyword prints the current values of the  frequently
		     used  options  to	set. Information about the current de-
		     fault server and host is also printed.

	      class=value
		     This keyword changes 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  informa-
		     tion.  The	 default is IN;	the abbreviation for this key-
		     word is cl.

	      nodebug
		     This keyword turns	on or off the display of the full  re-
		     sponse  packet,  and  any	intermediate response packets,
		     when searching. The default for this keyword is  nodebug;
		     the abbreviation for this keyword is [no]deb.

	      nod2   This  keyword  turns  debugging mode on or	off. This dis-
		     plays more	about what nslookup is doing. The  default  is
		     nod2.

	      domain=name
		     This keyword sets the search list to name.

	      nosearch
		     If	 the  lookup request contains at least one period, but
		     does not end with a trailing period, this keyword appends
		     the domain	names in the domain search list	to the request
		     until an answer is	received. The default is search.

	      port=value
		     This keyword changes the default TCP/UDP name server port
		     to	 value from its	default, port 53. The abbreviation for
		     this keyword is po.

	      querytype=value |	type=value
		     This keyword changes the type of the information query to
		     value.  The  defaults  are	A and then AAAA; the abbrevia-
		     tions for these keywords are q and	ty.

		     Please note that it is only possible to specify one query
		     type. Only	the default behavior looks up both when	an al-
		     ternative is not specified.

	      norecurse
		     This keyword tells	the name server	to query other servers
		     if	 it  does not have the information. The	default	is re-
		     curse; the	abbreviation for this keyword is [no]rec.

	      ndots=number
		     This keyword sets the number of dots  (label  separators)
		     in	 a  domain that	disables searching. Absolute names al-
		     ways stop searching.

	      retry=number
		     This keyword sets the number of retries to	number.

	      timeout=number
		     This keyword changes the initial timeout interval to wait
		     for a reply to number, in seconds.

	      novc   This  keyword indicates that a virtual circuit should al-
		     ways be used when sending requests	to the	server.	  novc
		     is	the default.

	      nofail This  keyword  tries  the next nameserver if a nameserver
		     responds with SERVFAIL or a referral (nofail), or	termi-
		     nates the query (fail) on such a response.	The default is
		     nofail.

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

IDN SUPPORT
       If  nslookup  has  been	built with IDN (internationalized domain name)
       support,	it can accept and display non-ASCII domain names. nslookup ap-
       propriately converts character encoding of a domain name	before sending
       a request to a DNS server or displaying a reply from  the  server.   To
       turn  off IDN support, define the IDN_DISABLE environment variable. IDN
       support is disabled if the variable is set when nslookup	runs, or  when
       the standard output is not a tty.

FILES
       /etc/resolv.conf

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

AUTHOR
       Internet	Systems	Consortium

COPYRIGHT
       2021, Internet Systems Consortium

9.16.12				  2021-02-04			   NSLOOKUP(1)

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

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