man netdiscover (8): an active/passive arp reconnaissance tool.

SYNOPSIS

netdiscover [-i device] [-r range | -l file | -p] [-s time] [-n node] [-c count] [-f] [-d] [-S] [-P] [-L]

DESCRIPTION

netdiscover is an active/passive arp reconnaissance tool, initially 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.

OPTIONS

-i device: The network interface to sniff and inject packets. If no interface is specified, first available will be used.
-r range: 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.
-l file Scan ranges contained on the given file, it must: contain one range per line.
-p: Enable passive mode. In passive mode, netdiscover does not send anything, but does only sniff.
-s time: Sleep given time in milliseconds between each arp request injection. (default 1)
-c count: Number of times to send each arp request. Useful for networks with packet loss, so it will scan given times for each host.
-n node: 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)
-S: 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)
-f: Enable fast mode scan. This will only scan for .1, .100 and .254 on each network. This mode is useful while searching for ranges being used. After you found such range you can make a specific range scan to find online boxes.
-d: 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.
-P: 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.
-L: When using -P, continue program execution after the active scan phase to capture ARP packets passively.

USAGE

If passive mode (-p), scan list (-l) or scan range (-r) options arent enabled, netdiscover will scan for common lan addresses.

Screen control keys

h: Show help screen
j: Scroll down (or down arrow)
k: Scroll up (or up arrow)
a: Show arp replies list
r: Show arp requests list
q: Close help screen or end application

CONFIG FILES

There are 2 configuration files that netdiscover will look for, each time it is executed, if file doesn't exist it will use default values. You can use the -d switch to disable reading and loading configuration files.

~/.netdiscover/ranges

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.

Example:
192.168.21.0/24
172.26.0.0/16
10.0.0.0/8

~/.netdiscover/fastips

List containing the last octect of the ips to be scanned on each subnet, when using fast mode, by default (1,100,154).

Example:
1
10
25
254

AUTHOR

netdiscover was written by Jaime Penalba Estebanez.