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CentOS 7.0 - man page for nslookup (centos section 1)

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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 (C) 2004-2007, 2010 Internet Systems Consortium, Inc. ("ISC")

BIND9					   Jun 30, 2000 			      NSLOOKUP(1)
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