Airodump-ng is used for packet capturing of raw 802.11 frames and is particularly suitable for collecting WEP IVs (Initialization Vector) for the intent of using them with aircrack-ng. If you have a GPS receiver connected to the computer, airodump-ng is capable of logging the coordinates of the found access points.
Additionally, airodump-ng writes out several files containing the details of all access points and clients seen.
usage: airodump-ng <options> <interface>[,<interface>,...] Options: --ivs : Save only captured IVs --gpsd : Use GPSd --write <prefix> : Dump file prefix -w : same as --write --beacons : Record all beacons in dump file --update <secs> : Display update delay in seconds --showack : Prints ack/cts/rts statistics -h : Hides known stations for --showack -f <msecs> : Time in ms between hopping channels --berlin <secs> : Time before removing the AP/client from the screen when no more packets are received (Default: 120 seconds) -r <file> : Read packets from that file -x <msecs> : Active Scanning Simulation --manufacturer : Display manufacturer from IEEE OUI list --uptime : Display AP Uptime from Beacon Timestamp --wps : Display WPS information (if any) --output-format <formats> : Output format. Possible values: pcap, ivs, csv, gps, kismet, netxml Short format "-o" The option can be specified multiple times. In this case, each file format specified will be output. Only ivs or pcap can be used, not both. --ignore-negative-one : Removes the message that says fixed channel <interface>: -1 --write-interval <seconds> : Output file(s) write interval in seconds
Filter options: --encrypt <suite> : Filter APs by cipher suite --netmask <netmask> : Filter APs by mask --bssid <bssid> : Filter APs by BSSID --essid <essid> : Filter APs by ESSID --essid-regex <regex> : Filter APs by ESSID using a regular expression -a : Filter unassociated clients By default, airodump-ng hop on 2.4GHz channels. You can make it capture on other/specific channel(s) by using: --channel <channels> : Capture on specific channels --band <abg> : Band on which airodump-ng should hop -C <frequencies> : Uses these frequencies in MHz to hop --cswitch <method> : Set channel switching method 0 : FIFO (default) 1 : Round Robin 2 : Hop on last -s : same as --cswitch --help : Displays this usage screen
What’s the meaning of the fields displayed by airodump-ng ?
airodump-ng will display a list of detected access points, and also a list of connected clients (“stations”). Here’s an example screenshot:
CH 9 ][ Elapsed: 1 min ][ 2007-04-26 17:41 ][ WPA handshake: 00:14:6C:7E:40:80 BSSID PWR RXQ Beacons #Data, #/s CH MB ENC CIPHER AUTH ESSID 00:09:5B:1C:AA:1D 11 16 10 0 0 11 54. OPN NETGEAR 00:14:6C:7A:41:81 34 100 57 14 1 9 11e WEP WEP bigbear 00:14:6C:7E:40:80 32 100 752 73 2 9 54 WPA TKIP PSK teddy BSSID STATION PWR Rate Lost Packets Probes 00:14:6C:7A:41:81 00:0F:B5:32:31:31 51 36-24 2 14 (not associated) 00:14:A4:3F:8D:13 19 0-0 0 4 mossy 00:14:6C:7A:41:81 00:0C:41:52:D1:D1 -1 36-36 0 5 00:14:6C:7E:40:80 00:0F:B5:FD:FB:C2 35 54-54 0 99 teddy
The first line shows the current channel, elapsed running time, current date and optionally if a WPA/WPA2 handshake was detected. In the example above, “WPA handshake: 00:14:6C:7E:40:80” indicates that a WPA/WPA2 handshake was successfully captured for the BSSID.
In the example above the client rate of “36-24” means:
The first number is the last data rate from the AP (BSSID) to the Client (STATION). In this case 36 megabits per second.
The second number is the last data rate from Client (STATION) to the AP (BSSID). In this case 24 megabits per second.
These rates may potentially change on each packet transmission. It is simply the last speed seen.
These rates are only displayed when locked to a single channel, the AP/client transmission speeds are displayed as part of the clients listed at the bottom.
NOTE: APs need more then one packet to appear on the screen. APs with a single packet are not displayed.