NSLOOKUP linux command manual

NSLOOKUP(1)                                                    NSLOOKUP(1)

       nslookup - query Internet name servers interactively

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

       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-inter-
       active  mode  is used to print just the name and requested information
       for a host or domain.

       Interactive mode is entered in the following cases:

       1.     when no arguments are given (the default name  server  will  be

       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 sec-
       ond 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

       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

       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.

                     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)

                     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)

                     Sets the search list to name.

                     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)

                     Change the default TCP/UDP name server port to value.

                     (Default = 53; abbreviation = po)


                     Change the top of the information query.

                     (Default = A; abbreviations = q, ty)

                     Tell the name server to query other servers if  it  does
                     not have the information.

                     (Default = recurse; abbreviation = [no]rec)

                     Set the number of retries to 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)


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

       Andrew Cherenson

BIND9                            Jun 30, 2000                     NSLOOKUP(1)