Find available three letter .io domains from list of any sized words in a file called ./wordlist.

get3io.rb

#!/usr/bin/env ruby
require 'whois'

def load_words
  three_letter_words = []
  File.open('./wordlist', 'r') do |infile|
    while (line = infile.gets)
      next if (line == nil or line.chomp.length > 3)
      three_letter_words.push(line.chomp)
    end
  end
  return three_letter_words
end

def query_and_report(domain, client=Whois::Client.new)
  if client.query(domain).available?
    puts "Available: #{domain}"
    File.open('./three_available', 'a') do |out|
      out.write("#{domain}\n")
    end
  end
end

def wait(rstart, rend)
  sleep(rand(rstart..rend))
end

c = Whois::Client.new
load_words.each do |word|
  query_and_report("#{word}.io",c)
  wait(1,3)
end