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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0. If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+.. highlight: console
+
+.. iscman:: nslookup
+.. program:: nslookup
+.. _man_nslookup:
+
+nslookup - query Internet name servers interactively
+----------------------------------------------------
+
+Synopsis
+~~~~~~~~
+
+:program:`nslookup` [-option] [name | -] [server]
+
+Description
+~~~~~~~~~~~
+
+:program:`nslookup` is a program to query Internet domain name servers.
+:program:`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 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, with an initial timeout of 10
+seconds, type:
+
+::
+
+ nslookup -query=hinfo -timeout=10
+
+The ``-version`` option causes :program:`nslookup` to print the version number
+and immediately exit.
+
+Interactive Commands
+~~~~~~~~~~~~~~~~~~~~
+
+``host [server]``
+ This command looks up information for :iscman:`host` using the current default server or
+ using ``server``, if specified. If :iscman:`host` is an Internet address and the
+ query type is A or PTR, the name of the host is returned. If :iscman:`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``
+ 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 answer 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 default 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 information. The default
+ is ``IN``; the abbreviation for this keyword is ``cl``.
+
+ ``nodebug``
+ This keyword turns on or off the display of the full response 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 displays 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 abbreviations 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 alternative is not specified.
+
+ ``norecurse``
+ This keyword tells the name server to query other servers if it does not have
+ the information. The default is ``recurse``; 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 always 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 always 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 terminates the query (fail) on such a response. The
+ default is ``nofail``.
+
+Return Values
+~~~~~~~~~~~~~
+
+:program:`nslookup` returns with an exit status of 1 if any query failed, and 0
+otherwise.
+
+IDN Support
+~~~~~~~~~~~
+
+If :program:`nslookup` has been built with IDN (internationalized domain name)
+support, it can accept and display non-ASCII domain names. :program:`nslookup`
+appropriately 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 :program:`nslookup` runs, or when the standard output is not a tty.
+
+Files
+~~~~~
+
+``/etc/resolv.conf``
+
+See Also
+~~~~~~~~
+
+:iscman:`dig(1) <dig>`, :iscman:`host(1) <host>`, :iscman:`named(8) <named>`.