NMBLOOKUP(1)                                                      NMBLOOKUP(1)

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

       nmblookup  [ -f ]  [ -M ]  [ -R ]  [ -S ]  [ -r ]  [ -A ]  [ -h ]  [ -B
       <broadcast address> ]  [ -U <unicast address> ]  [ -d <debug  level>  ]
       [ -s <smb config file> ]  [ -i <NetBIOS scope> ]  [ -T ]  name

       This tool is part of the  Samba 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.

       -f     Causes nmblookup to print out the flags in the NMB packet  head-
              ers.  These  flags will print out as strings like Authoritative,
              Recursion_Desired, Recursion_available, etc.

       -M     Searches for a master browser by looking  up  the  NetBIOS  name
              name  with a type of 0x1d. If  name is "-" then it does a lookup
              on the special name __MSBROWSE__.

       -R     Set the recursion desired bit in the packet to  do  a  recursive
              lookup. This is used when sending a name query to a machine run-
              ning a WINS server and the user wishes to query the names in the
              WINS server. If this bit is unset the normal (broadcast respond-
              ing) NetBIOS processing code on a machine is used  instead.  See
              rfc1001, rfc1002 for details.

       -S     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     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     Interpret  name  as  an IP Address and do a node status query on
              this address.

       -h     Print a help (usage) message.

       -B <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 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.

       -d <debuglevel>
              debuglevel is an integer from 0 to 10.

              The default value if this parameter is not specified is zero.

              The  higher this value, the more detail will be logged about the
              activities of nmblookup. At level 0, only  critical  errors  and
              serious warnings will be logged.

              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 data, most of which is extremely cryptic.

              Note that specifying this parameter here will override the   log
              level parameter in the  smb.conf(5) file.

       -s <smb.conf>
              This parameter specifies the pathname to the Samba configuration
              file,  smb.conf(5) This file controls all aspects of  the  Samba
              setup on the machine.

       -i <scope>
              This specifies a NetBIOS scope that nmblookup will use to commu-
              nicate 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.

       -T     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

              IP address .... NetBIOS name

              pair that is the normal output.

       name   This is the NetBIOS name being queried. Depending upon the  pre-
              vious  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 -R 'IRIX#1B'

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

       This man page is correct for version 2.2 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
       <URL:>)  and  updated  for the Samba 2.0
       release by Jeremy Allison. The conversion to DocBook for Samba 2.2  was
       done by Gerald Carter

                               19 November 2002                   NMBLOOKUP(1)