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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:

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 debugging mode on. A lot more information is printed about
             the packet sent to the server and the resulting answer.

             (Default = nodebug; abbreviation = [no]deb)

          [no]d2
             Turn debugging mode on. A lot more information is printed about
             the packet sent to the server and the resulting answer.

             (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)

FILES
       /etc/resolv.conf

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

AUTHOR
       Andrew Cherenson

COPYRIGHT
       Copyright (C) 2004-2006 Internet Systems Consortium, Inc. ("ISC")

BIND9                            Jun 30, 2000                      NSLOOKUP(1)

NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | INTERACTIVE COMMANDS | FILES | SEE ALSO | AUTHOR | COPYRIGHT

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