NMBLOOKUP(1) User Commands NMBLOOKUP(1)
nmblookup - NetBIOS over TCP/IP client used to lookup NetBIOS names
nmblookup [-M|--master-browser] [-R|--recursion] [-S|--status] [-r|--root-port]
[-A|--lookup-by-ip] [-B|--broadcast <broadcast address>] [-U|--unicast <unicast address>]
[-d <debug level>] [-s <smb config file>] [-i <NetBIOS scope>] [-T|--translate]
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.
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 -- -.
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
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.
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.
Interpret name as an IP Address and do a node status query on this address.
-n|--netbiosname <primary NetBIOS name>
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.
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
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
-O|--socket-options socket options
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.
Print a summary of command line options.
Display brief usage message.
-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
-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.
level is an integer from 0 to 10. The default value if this parameter is not specified
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
Prints the program version number.
The file specified contains the configuration details required by the server. The
information in this file includes server-specific information such as what printcap
file to use, as well as descriptions of all the services that the server is to
provide. See smb.conf for more information. The default configuration file name is
determined at compile time.
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.
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.
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.
Show which flags apply to the name that has been looked up. Possible answers are zero
or more of: Response, Authoritative, Truncated, Recursion_Desired,
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.
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
This man page is correct for version 3 of the Samba suite.
nmbd(8), samba(7), and smb.conf(5).
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.
The original Samba man pages were written by Karl Auer. The man page sources were
converted to YODL format (another excellent piece of Open Source software, available at
ftp://ftp.icce.rug.nl/pub/unix/) and updated for the Samba 2.0 release by Jeremy Allison.
The conversion to DocBook for Samba 2.2 was done by Gerald Carter. The conversion to
DocBook XML 4.2 for Samba 3.0 was done by Alexander Bokovoy.
Samba 4.0 06/17/2014 NMBLOOKUP(1)