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:

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



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           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)




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                [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.



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                   (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 Internet Systems Consortium, Inc.
       ("ISC")


































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