netdiscover - active/passive ARP reconnaissance tool
netdiscover [-i device] [-r range | -l file | -p] [-m file] [-F filter]
[-s time] [-c count] [-n node] [-dfPLNS]
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.
- -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.
Currently, acceptable ranges are /8, /16 and /24 only.
- -l
file
- Scan ranges contained on the given file. It must contain only one
range per line.
- -p
- Enable passive mode. In passive mode, netdiscover does not send
anything, but does only sniff.
- -m
file
- Scan a list of known MACs and host names.
- -F
filter
- Customize pcap filter expression (default: "arp").
- -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. (default 1)
- -n
node
- Last IP octet of the source IP used for scanning. You can change it if the
default host (x.x.x.67) is already used. (allowed range is 2 to
253, default 67)
- -d
- Ignore configuration files at home dir (for autoscan and fast mode only).
This will use default ranges and IPs for autoscan and fast mode. See below
for information about configuration files.
- -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.
- -P
- Produces an output suitable to be redirected into a file or to be
parsed by another program, instead of using interactive mode. Enabling
this option, netdiscover will stop after scanning given
ranges.
- -L
- Similar to -P but continue program execution to capture ARP packets
passively after the active scan. phase to capture ARP packets
passively.
- -N
- Do not print header. Only valid when -P or -L is
enabled.
- -S
- (DEPRECATED) 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)
If passive mode (-p), scan list (-l) or scan
range (-r) options aren't enabled, netdiscover will
scan for common LAN addresses (192.168.0.0/16, 172.16.0.0/12 and
10.0.0.0/8).
Screen control keys:
h Show help screen.
j Scroll down (or down arrow).
k Scroll up (or up arrow).
. Scroll page up.
, Scroll page down.
q Close help screen or end application.
Screen views:
a Show ARP replies list.
r Show ARP requests list.
u Show unique hosts detected.
There are 2 configuration files that netdiscover will look
for, each time it is executed. If files doesn't exist,
netdiscover 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 octet of the IPs to be scanned on each subnet,
when using fast mode (-f), by default (1,100,154). You must put a
number per line.
Scan common LAN addresses on eth0:
# netdiscover -i eth0
Fast scan common LAN addresses on eth0 (search only for gateways):
# netdiscover -i eth0 -f
Scan some fixed ranges:
# netdiscover -i eth0 -r 172.26.0.0/24
# netdiscover -r 192.168.0.0/16
# netdiscover -r 10.0.0.0/8
Scan common LAN addresses with sleep time 0.5 milliseconds instead of
default 1:
# netdiscover -s 0.5
Scan fixed range on fast mode with sleep time 0.5 milliseconds
instead of default 1:
# netdiscover -r 192.168.0.0/16 -f -s 0.5
Scan a range using 101 as last octet for SOURCE IP
# netdiscover -r 10.1.0.0/16 -n 101
Only sniff for ARP traffic, don't send nothing:
# netdiscover -p
netdiscover was written by Jaime Penalba Estebanez
<jpenalbae@gmail.com>.
This manual page was originally written by Nicolas Weyland, for
the Debian project. This man page has been merged into netdiscover
project and modified from the original by Jaime Penalba and Joao Eriberto
Mota Filho.