netdiscover is an active/passive arp reconnaissance tool, initialy developed to gain information about wireless networks without dhcp servers in wardriving scenarios. It can also be used on switched networks. Built on top of libnet and libpcap, it can passively detect online hosts or search for them by sending arp requests.
Furthermore, it can be used to inspect your network's arp traffic, or find network addresses using auto scan mode, which will scan for common local networks.
The network interface to sniff and inject packets. If no interface is
specified, first available will be used.
Scan a given range instead of auto scan. Valid range values area for example:
192.168.0.0/24, 192.168.0.0/16 or 192.168.0.0/8.
Scan ranges contained on the given file, it must contain one range per line.
Enable passive mode. In passive mode, netdiscover does not send anything, but does only sniff.
Sleep given time in milliseconds between each arp request
injection. (default 1)
Number of times to send each arp request. Useful for networks with
packet loss, so it will scan given times for each host.
Last ip octet of the source ip used for scanning. You can change it
if the default host is already used. (allowed range: 2 to 253, default 66)
Enable sleep time suppression between each request. If set, netdiscover
will sleep after having scanned 255 hosts instead of sleeping after each one.
This mode was used in netdiscover 0.3 beta4 and before. Avoid this option in networks with
packet loss, or in wireless networks with low signal level. (also called hardcore mode)
Enable fast mode scan. This will only scan for .1, .100 and .254 on each
network. This mode is usefull while searching for ranges being used.
After you found such range you can make a specific range scan to find online boxes.
Ignore configuration files at home dir, this will use defaults ranges and ips
for autoscan and fast mode. See below for information about configuration files.
Produces output suitable to be redirected into a file or be parsed by another
program, instead of using interactive mode. Enabling this option, netdiscover
will stop after scanning given ranges.
When using -P, continue program execution after the active scan phase to capture ARP packets passively.
If passive mode (-p), scan list (-l) or scan range (-r) options arent enabled, netdiscover will scan for common lan addresses.
Screen control keys
Show help screen
Scroll down (or down arrow)
Scroll up (or up arrow)
Show arp replys list
Show arp requests list
Close help screen or end application
There are 2 configuration files that netdiscover will look for, each time it is
executed, if file doesnt exist it will use default values. You can use the -d switch to disable reading and loading configuration files.
This file contains a list of ranges (one per line) used for auto scan mode
instead of default ranges. By default netdiscover will use a list of common
ranges used on local networks.
List contaning the last octect of the ips to be scanned on each subnet, when using fast mode, by default (1,100,154).
netdiscover was written by Jaime Penalba Estebanez.
This manual page was originaly written by Nicolas Weyland, for the Debian project. This man page has been merged into netdiscover project, and modified from the original.