SubHai? [a Wordlist Based Subdomain Finder]

require 'socket'

puts "\n---------------------------------------------------------------------------------
   _____       _     _    _       _   ___
  / ____|     | |   | |  | |     (_) |__ \\
 | (___  _   _| |__ | |__| | __ _ _     ) |
  \\___ \\| | | | '_ \\|  __  |/ _` | |   / /
  ____) | |_| | |_) | |  | | (_| | |  |_|
 |_____/ \\__,_|_.__/|_|  |_|\\__,_|_|  (_) ~ AnonGuy [ an0nguy @ protonmail.ch ]"

print "\nPlease Enter The Domain Name -- "
domain = gets.chomp.chomp('/').sub(/^https?\:\/\/(www.)?/, '')
print 'Wordlist                     -- '
dictionary = gets.chomp # Your wordlist, or dictionary, if you may ..
testDomain = 'l0lwal33t.'+domain
count = 0

def exists(subdomain)
    begin
        Socket.gethostbyname(subdomain)
    rescue SocketError
        return false
    end
        return true
end

puts '---------------------------------------------------------------------------------'

if exists(testDomain) == true
    abort("Wildcard Subdomain (*) exists! :(\nEnding Script Execution . . .\n---------------------------------------------------------------------------------")
end

File.new(dictionary).each_line do |word|
    subdomain = "#{word.chomp}.#{domain}"
    if exists(subdomain) == true
        count += 1
        puts "#{count.to_s} -- #{subdomain} exists!"
    end
end

puts "---------------------------------------------------------------------------------\nTotal Subdomains Found --\> #{count.to_s}\n---------------------------------------------------------------------------------"