YADIFA is an open-source authoritative DNS name server with DNSSEC support, built for managing large DNS zones. It is distributed as source code under the BSD-3-Clause licence and runs on infrastructure that the operator controls. It is an alternative to proprietary authoritative name server products, and to other open-source servers such as BIND, for organisations that want a name server developed in Europe.
YADIFA was developed by EURid, the Belgian operator of the .eu registry. The trademark is held by EURid vzw, based in Diegem, Belgium. Because the software runs on servers the operator manages, zone data is not routed through a third-party cloud provider. The project's repository describes it as a lightweight authoritative name server with DNSSEC capabilities. Organisations that adopt it should plan their own patching, monitoring and DNSSEC key management, as they would for any self-hosted name server.