RcodeZero is an Austrian managed DNS service operator founded in 2010 to secure Austria’s .at top-level domain. It runs a globally distributed Anycast DNS network: as of its 15th anniversary, the site reports serving over 30 million domain zones for hundreds of customers. The company is certified under ISO 27001 (since 2014) for its DNS infrastructure and promises personalized consulting and two decades of DNS experience. All of its DNS services emphasize security and high availability.