netdiscover

Not saying anything smart in this post, just placing here as note to self about the name of this tool and basic commands to get it started if I'm on a new machine that needs it.

sudo apt-get install netdiscover
sudo netdiscover
sudo netdiscover -r 192.168.1.0/24
sudo netdiscover -i wlan0 -r 192.168.1.0/24
sudo netdiscover -h
Netdiscover 0.3-beta7 [Active/passive arp reconnaissance tool]
Written by: Jaime Penalba 

Usage: netdiscover [-i device] [-r range | -l file | -p] [-s time] [-n node] [-c count] [-f] [-d] [-S] [-P] [-C]
  -i device: your network device
  -r range: scan a given range instead of auto scan. 192.168.6.0/24,/16,/8
  -l file: scan the list of ranges contained into the given file
  -p passive mode: do not send anything, only sniff
  -F filter: Customize pcap filter expression (default: "arp")
  -s time: time to sleep between each arp request (miliseconds)
  -n node: last ip octet used for scanning (from 2 to 253)
  -c count: number of times to send each arp reques (for nets with packet loss)
  -f enable fastmode scan, saves a lot of time, recommended for auto
  -d ignore home config files for autoscan and fast mode
  -S enable sleep time supression betwen each request (hardcore mode)
  -P print results in a format suitable for parsing by another program
  -L in parsable output mode (-P), continue listening after the active scan is completed

If -r, -l or -p are not enabled, netdiscover will scan for common lan addresses.