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require 'rubygems' if "#{RUBY_VERSION}" < "1.9.0"
require 'net/dns'
a = ["ibm.com", "sun.com", "redhat.com"]
threads = []
for dom in a
threads << Thread.new(dom) do |domain|
res = Net::DNS::Resolver.new
res.query(domain, Net::DNS::NS).each_nameserver do |ns|
puts "Domain #{domain} has nameserver #{ns}"
end
puts ""
end
end
threads.each do |t|
t.join
end