Manual Pages for UNIX Operating System command usage for man nslookup

System Administration Commands                       nslookup(1M)



NAME
     nslookup - query Internet name servers interactively

SYNOPSIS
     nslookup [-option] [name | -] [server]


DESCRIPTION
     The nslookup utility is a program to query  Internet  domain
     name  servers.  It  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.

PARAMETERS
     Interactive mode is entered in the following cases:

         1.   No arguments are given (the default name server  is
              used).

         2.   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  informa-
     tion, and the initial timeout to 10 seconds, type:

       nslookup -query=hinfo  -timeout=10



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.



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System Administration Commands                       nslookup(1M)



     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




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System Administration Commands                       nslookup(1M)



             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 infor-
             mation.

             (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)






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System Administration Commands                       nslookup(1M)



         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 top 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



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System Administration Commands                       nslookup(1M)



             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

         resolver configuration file


ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | network/dns/bind            |
    |_____________________________|_____________________________|
    | Interface Stability         | Volatile                    |
    |_____________________________|_____________________________|


SEE ALSO
     dig(1M), host(1M), named(1M), attributes(5)


     See the BIND 9 Administrator's Reference Manual. As  of  the
     date  of  publication  of  this  man  page, this document is
     available                                                 at
     https://www.isc.org/software/bind/documentation.

NOTES
     BIND 9 nslookup is deprecated and not as  full  featured  as
     its  BIND  8  version.  For  more features and functionality
     refer to dig(1M).






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System Administration Commands                       nslookup(1M)



     nslookup and dig(1M) now report "Not Implemented" as  NOTIMP
     rather   than NOTIMPL. This will have impact on scripts that
     are looking for NOTIMPL.




















































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