localnet.rb

#!/usr/bin/env ruby

# quick hack to show all devices on the local lan

subnet = '192.168.80'
range = 1..254

range.each do |i|
  str = `host #{subnet}.#{i}`
  unless str =~ /NXDOMAIN/
    if str =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)\..*\s(\S+)\.\s*$/
      ip = sprintf("%-15.15s", "#{$4}.#{$3}.#{$2}.#{$1}")
      name = $5
      puts "#{ip}  #{name}"
    end
  end
end