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A thread-aware DNS resolver library written in Ruby


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Resolv is a thread-aware DNS resolver library written in Ruby. Resolv can handle multiple DNS requests concurrently without blocking the entire Ruby interpreter.


Add this line to your application's Gemfile:

gem 'resolv'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install resolv


p Resolv.getaddress ""
p Resolv.getname "" do |dns|
  ress = dns.getresources "", Resolv::DNS::Resource::IN::A
  ress = dns.getresources "", Resolv::DNS::Resource::IN::MX
  p { |r| [, r.preference] }


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at