dnsdist is an open-source DNS load balancer and firewall that sits in front of DNS servers. It distributes queries across backends, and its rules detect traffic that looks like denial-of-service attacks or abuse, then shunt or block it. The customer installs and operates it on its own infrastructure. It is licensed under the GNU General Public License version 2 and is part of the PowerDNS source repository. It is an alternative to proprietary DNS traffic-management appliances.
dnsdist is maintained by PowerDNS.COM B.V., a company registered in The Hague, Netherlands. Because the company is established in the EU and the software runs on the operator's own servers, query data stays under the customer's control and within European jurisdiction. The project continues to publish releases, with several in 2026. Commercial help and support are available from the company on request, separately from the free software.