NAME

       nmblookup - NetBIOS over TCP/IP client used to lookup NetBIOS names

SYNOPSIS

       nmblookup [-M|--master-browser] [--recursion] [-S|--status] [-r|--root-port] [-A|--lookup-by-ip]
        [-B|--broadcast=BROADCAST-ADDRESS] [-U|--unicast=UNICAST-ADDRESS] [-T|--translate] [-f|--flags]
        [-?|--help] [--usage] [-d|--debuglevel=DEBUGLEVEL] [--debug-stdout] [--configfile=CONFIGFILE]
        [--option=name=value] [-l|--log-basename=LOGFILEBASE] [--leak-report] [--leak-report-full]
        [-R|--name-resolve=NAME-RESOLVE-ORDER] [-O|--socket-options=SOCKETOPTIONS]
        [-m|--max-protocol=MAXPROTOCOL] [-n|--netbiosname=NETBIOSNAME] [--netbios-scope=SCOPE]
        [-W|--workgroup=WORKGROUP] [--realm=REALM] {name}

DESCRIPTION

       This tool is part of the samba(7) suite.

       nmblookup is used to query NetBIOS names and map them to IP addresses in a network using NetBIOS over
       TCP/IP queries. The options allow the name queries to be directed at a particular IP broadcast area or to
       a particular machine. All queries are done over UDP.

OPTIONS

       -M|--master-browser
           Searches for a master browser by looking up the NetBIOS name with a type of 0x1d. If
            name is "-" then it does a lookup on the special name __MSBROWSE__. Please note that in order to use
           the name "-", you need to make sure "-" isn't parsed as an argument, e.g. use : nmblookup -M -- -.

       --recursion
           Set the recursion desired bit in the packet to do a recursive lookup. This is used when sending a
           name query to a machine running a WINS server and the user wishes to query the names in the WINS
           server. If this bit is unset the normal (broadcast responding) NetBIOS processing code on a machine
           is used instead. See RFC1001, RFC1002 for details.

       -S|--status
           Once the name query has returned an IP address then do a node status query as well. A node status
           query returns the NetBIOS names registered by a host.

       -r|--root-port
           Try and bind to UDP port 137 to send and receive UDP datagrams. The reason for this option is a bug
           in Windows 95 where it ignores the source port of the requesting packet and only replies to UDP port
           137. Unfortunately, on most UNIX systems root privilege is needed to bind to this port, and in
           addition, if the nmbd(8) daemon is running on this machine it also binds to this port.

       -A|--lookup-by-ip
           Interpret name as an IP Address and do a node status query on this address.

       -B|--broadcast <broadcast address>
           Send the query to the given broadcast address. Without this option the default behavior of nmblookup
           is to send the query to the broadcast address of the network interfaces as either auto-detected or
           defined in the interfaces parameter of the smb.conf(5) file.

       -U|--unicast <unicast address>
           Do a unicast query to the specified address or host unicast address. This option (along with the -R
           option) is needed to query a WINS server.

       -T|--translate
           This causes any IP addresses found in the lookup to be looked up via a reverse DNS lookup into a DNS
           name, and printed out before each

           IP address .... NetBIOS name

           pair that is the normal output.

       -f|--flags
           Show which flags apply to the name that has been looked up. Possible answers are zero or more of:
           Response, Authoritative, Truncated, Recursion_Desired, Recursion_Available, Broadcast.

       name
           This is the NetBIOS name being queried. Depending upon the previous options this may be a NetBIOS
           name or IP address. If a NetBIOS name then the different name types may be specified by appending
           '#<type>' to the name. This name may also be '*', which will return all registered names within a
           broadcast area.

       -d|--debuglevel=DEBUGLEVEL
           level is an integer from 0 to 10. The default value if this parameter is not specified is 1 for
           client applications.

           The higher this value, the more detail will be logged to the log files about the activities of the
           server. At level 0, only critical errors and serious warnings will be logged. Level 1 is a reasonable
           level for day-to-day running - it generates a small amount of information about operations carried
           out.

           Levels above 1 will generate considerable amounts of log data, and should only be used when
           investigating a problem. Levels above 3 are designed for use only by developers and generate HUGE
           amounts of log data, most of which is extremely cryptic.

           Note that specifying this parameter here will override the log level parameter in the smb.conf file.

       --debug-stdout
           This will redirect debug output to STDOUT. By default all clients are logging to STDERR.

       --configfile=<configuration file>
           The file specified contains the configuration details required by the client. The information in this
           file can be general for client and server or only provide client specific like options such as client
           smb encrypt. See smb.conf for more information. The default configuration file name is determined at
           compile time.

       --option=<name>=<value>
           Set the smb.conf(5) option "<name>" to value "<value>" from the command line. This overrides
           compiled-in defaults and options read from the configuration file. If a name or a value includes a
           space, wrap whole --option=name=value into quotes.

       -l|--log-basename=logdirectory
           Base directory name for log/debug files. The extension ".progname" will be appended (e.g.
           log.smbclient, log.smbd, etc...). The log file is never removed by the client.

       --leak-report
           Enable talloc leak reporting on exit.

       --leak-report-full
           Enable full talloc leak reporting on exit.

       -V|--version
           Prints the program version number.

       -R|--name-resolve=NAME-RESOLVE-ORDER
           This option is used to determine what naming services and in what order to resolve host names to IP
           addresses. The option takes a space-separated string of different name resolution options. The best
           ist to wrap the whole --name-resolve=NAME-RESOLVE-ORDER into quotes.

           The options are: "lmhosts", "host", "wins" and "bcast". They cause names to be resolved as follows:

                  •   lmhosts: Lookup an IP address in the Samba lmhosts file. If the line in lmhosts has no
                      name type attached to the NetBIOS name (see the lmhosts(5) for details) then any name type
                      matches for lookup.

                  •   host: Do a standard host name to IP address resolution, using the system /etc/hosts, NIS,
                      or DNS lookups. This method of name resolution is operating system dependent, for instance
                      on IRIX or Solaris this may be controlled by the /etc/nsswitch.conf file). Note that this
                      method is only used if the NetBIOS name type being queried is the 0x20 (server) name type,
                      otherwise it is ignored.

                  •   wins: Query a name with the IP address listed in the wins server parameter. If no WINS
                      server has been specified this method will be ignored.

                  •   bcast: Do a broadcast on each of the known local interfaces listed in the interfaces
                      parameter. This is the least reliable of the name resolution methods as it depends on the
                      target host being on a locally connected subnet.

           If this parameter is not set then the name resolve order defined in the smb.conf file parameter (name
           resolve order) will be used.

           The default order is lmhosts, host, wins, bcast. Without this parameter or any entry in the name
           resolve order parameter of the smb.conf file, the name resolution methods will be attempted in this
           order.

       -O|--socket-options=SOCKETOPTIONS
           TCP socket options to set on the client socket. See the socket options parameter in the smb.conf
           manual page for the list of valid options.

       -m|--max-protocol=MAXPROTOCOL
           The value of the parameter (a string) is the highest protocol level that will be supported by the
           client.

           Note that specifying this parameter here will override the client max protocol parameter in the
           smb.conf file.

       -n|--netbiosname=NETBIOSNAME
           This option allows you to override the NetBIOS name that Samba uses for itself. This is identical to
           setting the netbios name parameter in the smb.conf file. However, a command line setting will take
           precedence over settings in smb.conf.

       --netbios-scope=SCOPE
           This specifies a NetBIOS scope that nmblookup will use to communicate with when generating NetBIOS
           names. For details on the use of NetBIOS scopes, see rfc1001.txt and rfc1002.txt. NetBIOS scopes are
           very rarely used, only set this parameter if you are the system administrator in charge of all the
           NetBIOS systems you communicate with.

       -W|--workgroup=WORKGROUP
           Set the SMB domain of the username. This overrides the default domain which is the domain defined in
           smb.conf. If the domain specified is the same as the servers NetBIOS name, it causes the client to
           log on using the servers local SAM (as opposed to the Domain SAM).

           Note that specifying this parameter here will override the workgroup parameter in the smb.conf file.

       -r|--realm=REALM
           Set the realm for the domain.

           Note that specifying this parameter here will override the realm parameter in the smb.conf file.

       -?|--help
           Print a summary of command line options.

       --usage
           Display brief usage message.

EXAMPLES

       nmblookup can be used to query a WINS server (in the same way nslookup is used to query DNS servers). To
       query a WINS server, nmblookup must be called like this:

       nmblookup -U server -R 'name'

       For example, running :

       nmblookup -U samba.org -R 'IRIX#1B'

       would query the WINS server samba.org for the domain master browser (1B name type) for the IRIX
       workgroup.

VERSION

       This man page is part of version 4.15.13-Ubuntu of the Samba suite.

SEE ALSO

       nmbd(8), samba(7), and smb.conf(5).

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed
       by the Samba Team as an Open Source project similar to the way the Linux kernel is developed.

Samba 4.15.13-Ubuntu                               02/01/2024                                       NMBLOOKUP(1)