Linux findsmb command

Updated: 06/16/2017 by Computer Hope

About findsmb

findsmb lists information about machines that respond to SMB name queries on a subnet.

Description

This perl script is part of the samba suite. findsmb is a perl script that prints out several pieces of information about machines on a subnet that respond to SMB name query requests. It uses nmblookup and smbclient to obtain this information.

findsmb syntax

findsmb [subnet-broadcast-address]

Options

-r

Controls whether findsmb takes bugs in Windows95 into account when trying to find a Netbios name registered of the remote machine. This option is disabled by default because it is specific to Windows 95 and Windows 95 machines only. If set, nmblookup will be called with -B option.

subnet-broadcast-address

Without this option, findsmb will probe the subnet of the machine where findsmb is run. This value is passed to nmblookup as part of the -B option.

Output

The output of findsmb lists the following information for all machines that respond to the initial nmblookup for any name:

  • IP address
  • NetBIOS name
  • Workgroup name
  • operating system
  • SMB server version

There will be a "+" in front of the workgroup name for machines that are local master browsers for that workgroup. There will be an "*" in front of the workgroup name for machines that are the domain master browser for that workgroup. Machines that are running Windows for Workgroups, Windows 95 or Windows 98 will not show any information about the operating system or server version.

The command with -r option must be run on a system without nmbd running. If nmbd is running on the system, you will only get the IP address and the DNS name of the machine. To get proper responses from Windows 95 and Windows 98 machines, the command must be run as root and with -r option on a machine without nmbd running.

findsmb examples

findsmb

findsmb displays information similar to the output below:

IP ADDR       NETBIOS NAME    WORKGROUP/OS/VERSION 
----------------------------------------------------------------------------------- 
192.168.35.10 MINESET-TEST1   [DMVENGR] 
192.168.35.55 LINUXBOX       *[MYGROUP] [Unix] [Samba 2.0.6] 
192.168.35.56 HERBNT2         [HERB-NT] 
192.168.35.63 GANDALF         [MVENGR] [Unix] [Samba 2.0.5a for IRIX] 
192.168.35.65 SAUNA           [WORKGROUP] [Unix] [Samba 1.9.18p10] 
192.168.35.71 FROGSTAR        [ENGR] [Unix] [Samba 2.0.0 for IRIX] 
192.168.35.78 BUDDYFRIEND    +[HERB] 
192.168.35.88 SCNT2          +[MVENGR] [Windows NT 4.0] [NT LAN Manager 

smbclient — An ftp-like client for accessing SMB/CIFS resources on servers.