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

       The -version option causes nslookup to print the version number and immediately exits.

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)

               ndots=number
                   Set  the  number of dots (label separators) in a domain that will disable searching. Absolute
                   names always stop searching.

               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 © 2004-2007, 2010, 2013, 2014 Internet Systems Consortium, Inc. ("ISC")

BIND9                                           January 24, 2014                                     NSLOOKUP(1)