NAME

       netdiscover - active/passive ARP reconnaissance tool

SYNOPSIS

       netdiscover [-i device] [-r range | -l file | -p] [-m file] [-F filter]
                   [-s time] [-c count] [-n node] [-dfPLNS]

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 include, for example: 192.168.0.0/24,
              192.168.2.0/23, 192.168.0.0/12, 192.168.0.0/8. Note that netdiscover is also  a  passive  scanner,
              and all detected IPs will be displayed, in addition to those included in the specified range.

       -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.

       -R     Assume user is root or that he has the required capabilities without running any checks.

       -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)

USAGE

       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.

CONFIG FILES

       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
           172.24.0.0/14
           10.0.0.0/12

       ~/.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.

USAGE EXAMPLES

       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

AUTHOR

       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.

netdiscover-0.20                                   13 May 2025                                    netdiscover(8)