nbtscan

nbtscan is a lightweight utility that you allows you to quickly search for open shares on a local or remote TCP-IP network by scanning for open NETBIOS name servers.
It’s a command line utility that was developed from the ‘nbtstat’ tool and apart from the latter, enables you to work on a number of addresses instead of one.
Since nbtscan runs from the command line, it doesn’t display an interface. You make use of it through simple arguments. To run the application you can either locate it from within the ‘Command Prompt’ screen or simply drag and release the EXE file inside it.
If you’re not familiar with what arguments you can or should use, nbtscan offers you a list of them along with a short description for each one. You are able to view it by running the application without providing any arguments.
nbtscan allows you to view the full NBT resource record responses and it can also generate HTTP headers. Moreover, it can create a Perl hashref output which can then be processed in another application.
With nbtscan you are also capable of specifying a UDP port number that is used to send a query. It does so by allowing you to bind to the 137 port instead of a random one and it can very well fix other problems that occur due to incorrect port use.
In case you want to scan a fairly large number of addresses, the application helps you avoid waiting for a response from servers that are down by offering you the chance to set up a specific time interval for eventual timeouts.
To sum things up, if you’re looking to search for open shares on you network, the you should definitely give nbtscan a run.