Monday, May 2, 2011


Network Mapping -> Identify Live Hosts -> nbtscan

nbtscan is capable of scanning IP ranges for NETBIOS names. It sends a NETBIOS status query to all IPs in the range, and lists the results.

nbtscan [-v] [-d] [-e] [-l] [-t timeout] [-b bandwidth] [-r] [-q] [-s separator]
[-m retransmits] (-f filename)|(<scan_range>)
-v verbose output. Print all names received
from each host
-d dump packets. Print whole packet contents.
-e Format output in /etc/hosts format.
-l Format output in lmhosts format.
Cannot be used with -v, -s or -h options.
-t timeout wait timeout milliseconds for response.
Default 1000.
-b bandwidth Output throttling. Slow down output
so that it uses no more that bandwidth bps.
Useful on slow links, so that ougoing queries
don't get dropped.
-r use local port 137 for scans. Win95 boxes
respond to this only.
You need to be root to use this option on Unix.
-q Suppress banners and error messages,
-s separator Script-friendly output. Don't print
column and record headers, separate fields with separator.
-h Print human-readable names for services.
Can only be used with -v option.
-m retransmits Number of retransmits. Default 0.
-f filename Take IP addresses to scan from file filename.
-f - makes nbtscan take IP addresses from stdin.
<scan_range> what to scan. Can either be single IP
like or
range of addresses in one of two forms: or
nbtscan -r
Scans the whole C-class network.
Scans a range from to
nbtscan -v -s :
Scans C-class network. Prints results in script-friendly
format using colon as field separator.
Produces output like that:
nbtscan -f iplist
Scans IP addresses specified in file iplist.

root@bt:~# nbtscan
Doing NBT name scan for addresses from

IP address NetBIOS Name Server User MAC address
------------------------------------------------------------------------------ Sendto failed: Permission denied NETGEARUSB <server> NETGEARUSB 00:00:00:00:00:00 OTTHON-BEA <server> BEA 00:50:8d:xx:xx:xx HOME-CSABI <unknown> 00:1c:25:xx:xx:xx Sendto failed: Permission denied
root@bt:~# nbtscan -s : Sendto failed: Permission denied :<server>:BEA :00:50:8d:xx:xx:xx :<server>:NETGEARUSB :00:00:00:00:00:00 ::<unknown>:00:1c:25:xx:xx:xx Sendto failed: Permission denied

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