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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


Mac OS X NOTICE
       The nslookup command does not use the host name and address resolution or the DNS query routing
       mechanisms used by other processes running on Mac OS X.  The results of name or address queries
       printed by nslookup may differ from those found by other processes that use the Mac OS X native name
       and address resolution mechanisms.  The results of DNS queries may also differ from queries that use
       the Mac OS X DNS routing library.

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)