nslookup

NSLOOKUP(1)                                                        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:

       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.

       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 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 to the
                     server.

                     (Default = novc)

FILES
       /etc/resolv.conf

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

AUTHOR
       Andrew Cherenson



BIND9                            Jun 30, 2000                      NSLOOKUP(1)